Qing Hao

Interests

Research

Nanoscale energy transport

Teaching

Heat transfer

Courses

Scholarly Contributions

Chapters

• Hao, Q., Zhao, H., & Xiao, Y. (2016). Multi-Length Scale Thermal Simulations of GaN-on-SiC High Electron Mobility Transistors. In Multiscale Thermal Transport in Energy Systems(pp Chapter 3).
• Hao, Q., & Chen, G. (2011). Frequency-Dependent Monte Carlo Simulations of Phonon Transport in Nanostructures. In Applications of Monte Carlo Method in Science and Engineering(pp 707-734). London, UK: InTech Press.

Journals/Publications

• Chen, Q., & Hao, Q. (2023). In-plane lattice thermal conductivity predictions of thin films within columnar grains. Journal of Applied Physics, 134(4), 045103.
• Hao, Q., Wang, S., Medina, F. J., & Chen, Q. (2023). In-plane thermal conductivity measurements of Si thin films under a uniaxial tensile strain. Journal of Applied Physics, 133(3), 035103. doi:10.1063/5.0125422
• Li, Q., Medina, F. J., Kokura, K., Jin, Z., Takahashi, K., & Hao, Q. (2023). In situ annealing of nanoporous silicon thin films with transmission electron microscopy. Applied Physics Letters, 123(24), 241601.
• Chen, Q., Yan, X., Xiao, Y., Wang, S., Wu, L., Cheng, G., Zheng, R., & Hao, Q. (2020). Small-Nanostructure-Size-Limited Phonon Transport within Composite Films Made of Single-Wall Carbon Nanotubes and Reduced Graphene Oxides. ACS Appl. Mater. Interfaces.
• Ghosh, M., Wu, L., Hao, Q., & Zhou, Q. (2022). A random forest with multi-fidelity Gaussian process leaves for modeling multi-fidelity data with heterogeneity. Computers & Industrial Engineering, 174, 108746.
• Hao, Q., Chen, Q., & Wang, S. (2022). Extension of the two-layer model to heat transfer coefficient predictions of nanoporous Si thin films. Applied Physics Letters, 121(1), 012201. doi:10.1063/5.0099312
• Hao, Q., Liang, X., Fan, A., Li, Z., Wei, N., Fan, W., Liang, H., Wang, H., Bi, P., Li, S., Wu, X., Lu, H., Zhang, X., & Zhang, Y. (2022). Highly Regulatable Heat Conductance of Graphene–Sericin Hybrid for Responsive Textiles. Advanced Functional Materials, 32(17), 2111121. doi:10.1002/adfm.202111121
• Hao, Q., Xiao, Y., Wang, S., Ma, J., Wan, X., Ma, D., & Yang, N. (2022). The unrevealed 3D morphological evolution of annealed nanoporous thin films. Nanoscale, 14(45), 17072-17079. doi:10.1039/d2nr04014j
• Li, Q., Hao, Q., Zhu, T., Zebarjadi, M., & Takahashi, K. (2020). Nanostructured and Heterostructured 2D Materials for Thermoelectrics. Engineered Science.
• W, W., Qiu, a., Hao, Q., Annamareddy, S., Xu, B. B., Zhang, J., Guo, Z., ,, ., & Jiang, Q. (2022). Electric Vehicle Revolution and Implications: Ion Battery and Energy. Engineered Science, 20, 100-109.
• Wang, S., Lu,  ., Negi,  ., He,  ., Kim,  ., Shao,  ., Jiang,  ., Liu , J., & Hao, Q. (2022). Revisiting the Reduction of Thermal Conductivity in Nano- to Micro-Grained Bismuth Telluride: The Importance of Grain-Boundary Thermal Resistance. Engineered Science, 17, 45-55.
• Wang, S., Xiao, Y., Chen, Q., & Hao, Q. (2022). Engineering thermal transport within Si thin films: The impact of nanoslot alignment and ion implantation. iScience, 25(11), 105386.
• Xiao, Y., & Hao, Q. (2020). Offset Nanoslot Pattern for Enhanced Thermal Anisotropy of Si Thin Films. International Journal of Heat and Mass Transfer.
• Hao, Q., & Garg, J. (2021). A Review on Phonon Transport within Polycrystalline Materials. ES Materials & Manufacturing, 14, 36-50.
• Hao, Q., Wang, S., Xiao, Y., Chen, Q., Yan, X., Wu, L., Cheng, G., & Zheng, R. (2021). Small-Nanostructure-Size-Limited Phonon Transport within Composite Films Made of Single-Wall Carbon Nanotubes and Reduced Graphene Oxides. ACS Applied Materials & Interfaces, 13(4), 5435-5444. doi:10.1021/acsami.0c20551
• Ji, R., Pan, T., Peng, G., Ma, J., Yang, N., & Hao, Q. (2021). An integrated thermoelectric heating-cooling system for air sterilization— a simulation study. Materials Today Physics, 19, 100430.
• Li, Q., Hao, Q., Zhu, T., Zebarjadi, M., & Takahashi, K. (2021). Nanostructured and Heterostructured 2D Materials for Thermoelectrics. Engineered Science, 13, 24-50.
• Swartz, B., Wu, L., Zhou, Q., & Hao, Q. (2021). Machine learning predictions of critical heat fluxes for pillar-modified surfaces. International Journal of Heat and Mass Transfer, 180, 121744.
• Xiao, Y., & Hao, Q. (2021). Nanoslot Patterns for Enhanced Thermal Anisotropy of Si Thin Films. International Journal of Heat and Mass Transfer, 170, 120944.
• Xiao, Y., Chen, Q., & Hao, Q. (2021). Inverse thermal design of nanoporous thin films for thermal cloaking. Materials Today Physics, 21, 100477.
• Xu, Y., Wang, X., & Hao, Q. (2021). A mini review on thermally conductive polymers and polymer-based composites. Composites Communications, 24, 100617.
• Hao, Q. (2020). Editorial: Improved Manufacturing Processes for Better Materials Properties — From Quantum Dots to Bulk Materials. ES Materials & Manufacturing, 8, 1-2.
• Hao, Q., & Xiao, Y. (2020). Periodic Nanoslot Patterns as an Effective Approach to Improve the Thermoelectric Performance of Thin Films. Physical Review Applied, 13, 064020.
• Hao, Q., Li, D., Wang, X., Kan, C., He, D., Li, Z., Zhao, H., Wu, C., Jin, C., & Cui, X. (2020). Structural Phase Transition of Multilayer VSe₂. ACS Applied Materials & Interfaces, 12(22), 25143-25149. doi:10.1021/acsami.0c04449
• Hao, Q., Xiao, Y., & Wang, S. (2020). Two-Step Modification of Phonon Mean Free Paths for Thin-Film-Based Nanostructures. International Journal of Heat and Mass Transfer, 153, 119636.
• Li, D., Wang, X., Kan, C., He, D., Li, Z., Hao, Q., Zhao, H., Wu, C., Jin, C., & Cui, X. (2020). Structural Phase Transition of Multilayer VSe2. ACS Applied Materials & Interfaces, 12(22), 25143-25149.
• Liang, R., Hao, Q., Xiao, Y., Li, Z., & Hong, Z. (2020). Thermal Effects in Single-Point Curing Process for Pulsed Infrared Laser-Assisted 3D Printing of Optics. 3D Printing and Additive Manufacturing, 7(4), 151-161. doi:10.1089/3dp.2020.0023
• Wang, S., Xu, D., Gurunathan, R., Snyder, G. J., & Hao, Q. (2020). Thermal studies of individual Si/Ge heterojunctions — The influence of the alloy layer on the heterojunction. Journal of Materiomics, 6(2), 248-255.
• Wu, L., Xiao, Y., Ghosh, M., Zhou, Q., & Hao, Q. (2020). Machine Learning Prediction for Bandgaps of Inorganic Materials. ES Materials & Manufacturing, 9, 3.
• Xiao, Y., Xu, D., Medina, F. J., Wang, S., & Hao, Q. (2020). Thermal Studies of Nanoporous Thin Films with Added Periodic Nanopores — A New Approach to Justify the Phononic Effects. Materials Today Physics, 12, 100179.
• Hao, Q. (2019). Editorial: Nanotechnology for Materials and Manufacturing — Physics, Synthesis, and Devices. ES Materials & Manufacturing, 5, 1.
• Hao, Q., & Xiao, Y. (2019). Electron Monte Carlo simulations of nanoporous Si thin films-The influence of pore-edge charges. Journal of Applied Physics, 125(6).
• Hao, Q., Xiao, Y., & Chen, Q. (2019). Determining phonon mean free path spectrum by ballistic phonon resistance within a nanoslot-patterned thin film. Materials Today Physics, 10, 100126.
• Hao, Q., Xiao, Y., & Medina, F. J. (2019). Annealing Studies of Nanoporous Si Thin Films Fabricated by Dry Etch. ES Materials & Manufacturing, 6, 24-27.
• Hao, Q., Yang, N., Ruan, X., & Lu, N. (2019). Editorial: Energy Transport for Nanostructured Materials. Frontiers in Energy Research, 7, 109.
• He, J., Hu, J., Mo, X., Hao, Q., Fan, Z., He, G., Wang, Y., Li, W., & He, Q. (2019). Novel photocatalyst nitrogen-doped simonkolleite Zn-5(OH)(8)Cl-2 center dot H2O with vis-up-conversion photoluminescence and effective visible-light photocatalysis. Applied Physics A: Materials Science and Processing, 125(1), 3.
• He, Q., Hao, Q., Wei, K., Wang, B., Hu, J., Chen, F., He, G., Wang, Y., Li, W., & Liu, J. (2019). Photocatalytic properties of a new Z-scheme system BaTiO₃/In₂S₃ with a core–shell structure. RSC Advances, 9(20), 11377-11384. doi:10.1039/c8ra10592h
• Xiao, Y., & Hao, Q. (2019). Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges. Journal of Applied Physics, 125(6), 064301. doi:10.1063/1.5078951
• Xiao, Y., Chen, Q., Ma, D., Yang, N., & Hao, Q. (2019). Phonon Transport within Periodic Porous Structures — From Classical Phonon Size Effects to Wave Effects. ES Materials & Manufacturing, 5, 2–18.
• Xu, D., Tang, S., Du, X., & Hao, Q. (2019). Detecting the major charge-carrier scattering mechanism in graphene antidot lattices. Carbon, 144, 601-607.
• Gervasio, D., Xiao, B., Hao, Q., Li, P., Wang, X., Xu, X., Li, Y., & Elsentriecy, H. (2018). Experimental Test of Properties of KCl–MgCl2 Eutectic Molten Salt for Heat Transfer and Thermal Storage Fluid in Concentrated Solar Power Systems. Journal of Solar Energy Engineering, 140(5). doi:10.1115/1.4040065
• Hao, Q. (2018). Editorial: Nanocomposite — From Improved Properties to Fundamental Understanding. ES Materials & Manufacturing, 2, 1.
• Hao, Q., & Lu, L. (2018). Editorial: Endless Frontiers — When Materials and Manufacturing Come Together. ES Materials & Manufacturing, 1, 2.
• Hao, Q., Coleman, G. J., Xu, D., Sega, E. R., Agee, P., Wu, S., & Lucas, P. (2018). Hot-Pressed GeSe4 Nanoparticles as a Thermal Insulation Material. Frontiers in Energy Research, 6, 21.
• Hao, Q., Coleman, G. J., Xu, D., Segal, E. R., Agee, P., Wu, S., & Lucas, P. (2018). Nanograined GeSe4 as a Thermal Insulation Material. Frontiers in Energy Research, 6, 21.
• Hao, Q., Xu, D., Zhao, H., Xiao, Y., & Medina, F. J. (2018). Thermal Studies of Nanoporous Si Films with Pitches on the Order of 100 nm -- Comparison between Different Pore-Drilling Techniques. Scientific Reports, 8(1), 9056.
• Hao, Q., Zhao, H., Xiao, Y., & Kronenfeld, M. B. (2018). Electrothermal studies of GaN-based high electron mobility transistors with improved thermal designs. International Journal of Heat and Mass Transfer, 116, 496-506.
• Hao, Q., Zhao, H., Xiao, Y., & Xu, D. (2018). Thermal investigation of nanostructured bulk thermoelectric materials with hierarchical structures: An effective medium approach. Journal of Applied Physics, 123(1), 014303.
• Hao, Q., Zhao, H., Xiao, Y., Wang, Q., & Wang, X. (2018). Hybrid Electrothermal Simulation of a 3-D Fin-Shaped Field-Effect Transistor Based on GaN Nanowires. IEEE Transactions on Electron Devices, 65(3), 921-927.
• Xiao, Y., Hong, Z., Coleman, G., Zhao, H., Liang, R., Lucas, P., & Hao, Q. (2018). Thermal Studies of Three-Dimensional Printing Using Pulsed Laser Heating. ES Materials & Manufacturing, 1, 21-26.
• Xu, D., Hanus, R., Xiao, Y., Wang, S., Snyder, G. J., & Hao, Q. (2018). Thermal boundary resistance correlated with strain energy in individual Si film-wafer twist boundaries. Materials Today Physics, 6, 53-59.
• Xu, D., Wang, Q., Wu, X., Zhu, J., Zhao, H., Xiao, B., Wang, X., Wang, X., & Hao, Q. (2018). Largely reduced cross-plane thermal conductivity of nanoporous In0.1Ga0.9N thin films directly grown by metal organic chemical vapor deposition. Frontiers in Energy, 12(1), 127--136.
• Xu, D., Xiao, Y., Hao, Q., & Zhao, H. (2018). Thermal investigation of nanostructured bulk thermoelectric materials with hierarchical structures: An effective medium approach. Journal of Applied Physics, 123(1), 014303. doi:10.1063/1.5006207
• Hao, Q., Hao, Q., Zhao, H., Zhao, H., Xu, D., & Xu, D. (2017). Thermoelectric studies of nanoporous thin films with adjusted pore-edge charges. Journal of Applied Physics, 121, 094308.
• Hao, Q., Xu, D., & Zhao, H. (2017). Computation-Driven Materials Search for Thermoelectric Applications. ECS Journal of Solid State Science and Technology, 6, N3095-N3102.
• Hao, Q., Zhao, H., & Xiao, Y. (2017). A hybrid simulation technique for electrothermal studies of two-dimensional GaN-on-SiC high electron mobility transistors. Journal of Applied Physics, 121, 204501.
• Hao, Q., Zhao, H., & Xu, D. (2017). Thermoelectric studies of nanoporous thin films with adjusted pore-edge charges. Journal of Applied Physics, 121(9).
• Li, Y., Xu, X., Wang, X., Li, P., Hao, Q., & Xiao, B. (2017). Survey and evaluation of equations for thermophysical properties of binary/ternary eutectic salts from NaCl, KCl, MgCl2, CaCl2, ZnCl2 for heat transfer and thermal storage fluids in CSP. Solar Energy, 152, 57–79.
• Xu, D., Hao, Q., & Zhao, H. (2017). Thermoelectric studies of nanoporous thin films with adjusted pore-edge charges. Journal of Applied Physics, 121(9), 094308. doi:10.1063/1.4977871
• Hao, Q., Hao, Q., Xiao, Y., Xiao, Y., Zhao, H., & Zhao, H. (2016). Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials. Journal of Applied Physics, 120, 065101.
• Hao, Q., Xiao, Y., & Zhao, H. (2016). Analytical model for phonon transport analysis of periodic bulk nanoporous structures. Applied Thermal Engineering, 111, 1409–1416.
• Hao, Q., Xu, D., Lu, N., & Zhao, H. (2016). High-throughput ZT predictions of nanoporous bulk materials as next-generation thermoelectric materials: A material genome approach. Physical Review B, 93, 205206.
• Hao, Q., Xu, X., Li, P., Molina, E., Wang, K., Dehghani, G., Kohli, A., Kassaee, M. H., Jeter, S. M., & Teja, A. S. (2016). Thermal and Transport Properties of NaCl–KCl–ZnCl2 Eutectic Salts for New Generation High-Temperature Heat-Transfer Fluids. Journal of Solar Energy Engineering, 138(5). doi:10.1115/1.4033793
• Li, P., Hao, Q., Jeter, S. M., & Teja, A. S. (2016). Thermal and Transport Properties of NaCl-KCl-ZnCl2 Eutectic Salts for New Generation High Temperature Heat Transfer Fluids. Journal of Solar Energy Engineering, 138(5), 054501. doi:10.1115/1.4033793
• Li, P., Molina, E., Wang, K., Xu, X., Dehghani, G., Kohli, A., Hao, Q., Kassaee, M. H., Jeter, S. M., & Teja, A. S. (2016). Thermal and Transport Properties of NaCl-KCl-ZnCl2 Eutectic Salts for New Generation High Temperature Heat Transfer Fluids. Journal of Solar Energy Engineering, 138(5), 054501. doi:10.1115/1.4033793
• Tuo, M., Xu, D., Li, S., Liang, M., Hao, Q., & Xin, H. (2016). Nonlinear Microwave Characterization of CVD Grown Graphene. IEEE Antennas and Wireless Propagation Letters, 15, 1557-1560. doi:10.1109/LAWP.2016.2517180
• Xiao, Y., Hao, Q., & Zhao, H. (2016). Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials. Journal of Applied Physics, 120(6), 065101. doi:10.1063/1.4959984
• Cui, J., Li, S., Hao, Q., Zhao, H., Zhao, H., Li, W., Wang, Y., Li, W., & He, Q. (2015). New method for preparing graphene by peeling graphite and facile fabrication of bulk Bi0.45Sb1.55Te3.02/graphene composites with dense texture and high ZT. RSC Advances, 5(53), 42492-42499.
• He, Q., Hao, Q., Cui, J., Li, S., Zhao, H., Zhao, H., Li, W., Wang, Y., & Li, W. (2015). New method for preparing graphene by peeling graphite and facile fabrication of bulk Bi_0.45Sb_1.55Te_3.02/graphene composites with dense texture and high ZT. RSC Advances, 5(53), 42492-42499. doi:10.1039/c5ra06463e
• Hao, Q. (2014). General Effective Medium Formulation for Thermal Analysis of a Polycrystal--The Influence of Partially Specular Phonon Transmission Across Grain Boundarie. Journal of Applied Physics, 116(3), 034305.
• He, Q., Hao, Q., Zhong, B., Zhang, Y., Li, W., Chen, Z., Cui, J., Li, W., & Xie, Y. (2014). High superionic conduction arising from aligned large lamellae and large figure of merit in bulk Cu_1.94Al_0.02Se. Applied Physics Letters, 105(12), 123902. doi:10.1063/1.4896520
• Li, D., Shao, Z., Hao, Q., & Zhao, H. (2014). Intrinsic Carrier Mobility of a Single-layer Graphene Covalently Bonded with Single-Walled Carbon Nanotubes. Journal of Applied Physics, 115(23), 23370.
• Zhong, B., Zhang, Y., Li, W., Chen, Z., Cui, J., Li, W., Xie, Y., Hao, Q., & He, Q. (2014). High Supersonic Conduction Arising from Aligned Large Lamellae and Large Figure of Merit in Bulk Cu(1.94)Al(0.02)Se. Applied Physics Letters, 105(12), 123902.
• Chen, H., Hao, Q., Zivkovic, O., Hautier, G., Du, L., Tang, Y., Hu, Y., Ma, X., Grey, C. P., & Ceder, G. (2013). Sidorenkite (Na3MnPO4CO3): A New Intercalation Cathode Material for Na-Ion Batteries. Chemistry of Materials, 25(14), 2777-2786.
• Lucas, P., Conseil, C., Yang, Z., Hao, Q., Cui, S., Boussard-Pledel, C., Bureau, B., Gascoin, F., Caillaud, C., Gulbiten, O., Guizouarn, T., Baruah, P., Li, Q., & Lucas, J. (2013). Thermoelectric bulk glasses based on the Cu-As-Te-Se system. Journal of Materials Chemistry A, 1(31), 8917-8925.
• Hao, Q. (2012). Beautiful Vibrations - Understand Phonons for Heat Transfer. Journal of Aeronautics and Aerospace Engineering, 1, e102.
• Hao, Q. (2012). Effective medium formulation for phonon transport analysis of nanograined polycrystals. Journal of Applied Physics, 111(1), 014307.
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  Abstract: For many research fields, it has been a challenge to accurately predict the lattice thermal conductivity of nanograined polycrystals, where the structure size becomes comparable or smaller than phonon mean free paths (MFPs). Although this can be achieved by advanced techniques such as phonon Monte Carlo simulations, they are generally complicated and can be very time-consuming especially when frequency-dependent phonon MFPs are considered. In this work, we apply the effective medium approach to phonon transport studies of polycrystals, which yields identical results as phonon Monte Carlo simulations in both frequency-dependent and frequency-independent analysis. The formulation can also be modified to consider additional factors, including grain boundaries with an additional interface layer, in-grain substructures, and grain size variation. This work provides a simple but accurate model for thermal studies of general polycrystals. © 2012 American Institute of Physics.
• Hao, Q. (2012). Influence of structure disorder on the lattice thermal conductivity of polycrystals: A frequency-dependent phonon-transport study. Journal of Applied Physics, 111(1), 014309.
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  Abstract: It is widely accepted that the lattice thermal conductivity of a polycrystal mainly depends on its grain sizes, phonon mean free paths, and grain-boundary thermal resistance. However, uncertainties always exist on how much grain misalignment and a wide grain size distribution in a real polycrystal could affect the thermal analysis. Considering frequency-dependent phonon mean free paths, the influence of these factors is carefully examined by phonon Monte Carlo simulations for a series of disordered silicon polycrystals with grain sizes ranging from 1 to 400 nm. More generally, simulations are also performed on thermally anisotropic polycrystals. Despite all structure variation, this work suggests that the direction-averaged lattice thermal conductivity of a polycrystal is always close to that of an aligned polycrystal, with an effective grain size matching the interface density of the studied polycrystal. © 2012 American Institute of Physics.
• Hao, Q. (2012). Taming Heat for Safe Lithium-Ion Batteries. Journal of Aeronautics and Aerospace Engineering.
• Zhu, G. H., Lan, Y. C., Wang, H., Joshi, G., Hao, Q., Chen, G., & Ren, Z. F. (2011). Effect of selenium deficiency on the thermoelectric properties of n-type In₄Se_3-x compounds. Physical Review B - Condensed Matter and Materials Physics, 83(11), 115201.
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  Abstract: Thermoelectric properties of dense bulk polycrystalline In 4Se3-x (x = 0, 0.25, 0.5, 0.65, and 0.8) compounds are investigated. A peak dimensionless thermoelectric figure of merit (ZT) of about 1 is achieved for x = 0.65 and 0.8. The peak ZT is about 50% higher than the previously reported highest value for polycrystalline In4Se 3-x compounds. Our In4Se3-x samples were prepared by ball milling and hot pressing. We show that it is possible to effectively control the electrical conductivity and thermal conductivity by controlling selenium (Se) deficiency x. The ZT enhancement is mainly attributed to the thermal conductivity reduction due to the increased phonon scattering by Se deficiency, defects, and nanoscale inclusions in the ball-milled and hot-pressed dense bulk In4Se3-x samples. © 2011 American Physical Society.
• Hao, Q., Zhu, G., Joshi, G., Wang, X., Minnich, A., Ren, Z., & Chen, G. (2010). Theoretical studies on the thermoelectric figure of merit of nanograined bulk silicon. Applied Physics Letters, 97(6), 063109.
• Hao, Q., Chen, G., & Jeng, M. (2009). Frequency-dependent Monte Carlo simulations of phonon transport in two-dimensional porous silicon with aligned pores. Journal of Applied Physics, 106(11), 114321.
• Muto, A., Kraemer, D., Hao, Q., Ren, Z. F., & Chen, G. (2009). Thermoelectric properties and efficiency measurements under large temperature differences. Review of Scientific Instruments, 80(9), 093901.
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  PMID: 19791947;Abstract: The maximum efficiency of a thermoelectric generator is determined by the material's dimensionless figure of merit ZT. Real thermoelectric material properties are highly temperature dependent and are often measured individually using multiple measurement tools on different samples. As a result, reported ZT values have large uncertainties. In this work we present an experimental technique that eliminates some of these uncertainties. We measure the Seebeck coefficient, electrical conductivity, and thermal conductivity of a single element or leg, as well as the conversion efficiency, under a large temperature difference of 2-160 °C. The advantages of this technique include (1) the thermoelectric leg is mounted only once and all measurements are in the same direction and (2) the measured properties are corroborated by efficiency measurements. The directly measured power and efficiency are compared to the values calculated from the measured properties and agree within 0.4% and 2%, respectively. The realistic testing conditions of this technique make it ideal for material characterization prior to implementation in a real thermoelectric generator. © 2009 American Institute of Physics.
• Ren, Z. F., Poudel, B., Ma, Y., Hao, Q., Lan, Y. C., Minnich, A., Muto, A., Yang, J., Yu, B., Yan, X., Wang, D. Z., Liu, J. M., Dresselhaus, M. S., & Chen, G. (2009). Enhancement of thermoelectric figure-of-merit by a nanostructure approach. Materials Research Society Symposium Proceedings, 1166, 83-93.
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  Abstract: The dimensionless thermoelectric figure-of-merit (ZT) in bulk materials has remained about 1 for many years. Here we show that a significant ZT improvement can be achieved in nanocrystalline bulk materials. These nanocrystalline bulk materials were made by hot- pressing nanopowders that are ball-milled from either crystalline ingots or elements. Electrical transport measurements, coupled with microstructure studies and modeling, show that the ZT improvement is the result of low thermal conductivity caused by the increased phonon scattering by grain boundaries and defects. More importantly, the nanostructure approach has been demonstrated in a few thermoelectric material systems, proving its generosity. The approach can be easily scaled up to multiple tons. Thermal stability studies have shown that the nanostructures are stable at the application temperature for an extended period of time. It is expected that such enhanced materials will make the existing cooling and power generation systems more efficient. © 2009 Materials Research Society.
• Yang, J., Hao, Q., Wang, H., Lan, Y. C., He, Q. Y., Minnich, A., Wang, D. Z., Harriman, J. A., Varki, V. M., Dresselhaus, M. S., Chen, G., & Ren, Z. F. (2009). Solubility study of Yb in n -type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties. Physical Review B - Condensed Matter and Materials Physics, 80(11), 115329.
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  Abstract: The solubility of Yb in Ybx Co4 Sb12 was reported to be 0.19 in bulk skutterudites made by melting and slow cooling method. Surprisingly we increased x close to 0.5 by a special sample preparation method: ball mill and hot press. We show that a higher Yb concentration not only increases the power factor due to a higher electron concentration but also reduces the thermal conductivity k because of stronger phonon scattering. In this way, we have achieved a dimensionless thermoelectric figure of merit ZT of about 1.2 at 550°C in Yb0.35 Co4 Sb12. © 2009 The American Physical Society.
• He, Q., Hao, Q., Wang, X., Yang, J., Lan, Y., Yan, X., Yu, B., Ma, Y., Poudel, B., Joshi, G., Wang, D., Chen, G., & Ren, Z. (2008). Nanostructured thermoelectric skutterudite Co _1-xNi _xSb ₃ alloys. Journal of Nanoscience and Nanotechnology, 8(8), 4003-4006.
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  PMID: 19049166;Abstract: Nanostructured Ni-doped skutterudites Co 1-xNi xSb 3 (with x ranging from 0.01 to 0.09) were prepared by ball milling and direct-current induced hot press. It was found that the thermal conductivity was reduced due to strong electron-phonon scattering from Ni-doping as well as phonon scattering from the increased grain boundary of the nanostructures. A maximum dimensionless figure-of-merit of 0.7 was obtained in Co 0.91Ni 0.09Sb 3 at 525°C. Copyright © 2008 American Scientific Publishers All rights reserved.
• He, Q., Hu, S., Tang, X., Lan, Y., Yang, J., Wang, X., Ren, Z., Hao, Q., & Chen, G. (2008). Erratum: The great improvement effect of pores on ZT in Co1-x Nix Sb3 system (Applied Physics Letters (2008) 93 (042108)). Applied Physics Letters, 93(8).
• He, Q., Hu, S., Tang, X., Lan, Y., Yang, J., Wang, X., Ren, Z., Hao, Q., & Chen, G. (2008). The great improvement effect of pores on ZT in Co1-x Nix Sb3 system. Applied Physics Letters, 93(4), 042108.
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  Abstract: In this paper, the Co1-x Nix Sb3+y system (x=0.1,0.2; y=0, 0.05) has been prepared by direct current induced hot press and annealing. Pores were made by annealing pressed Co1-x Nix Sb3.05 pellets into Co1-x Nix Sb3 pellets during annealing. It was found that from room temperature to 500 °C, the pores with diameter larger than 1 μm has significantly increased the Seebeck coefficient, considerably decreased the thermal conductivity, almost maintained the electrical conductivity constant, and therefore markedly improved the dimensionless figure of merit (ZT) of Co1-x Nix Sb3 system. By comparing the samples, we conclude that inducing pores into skutterudites is an effective route to greatly improve the ZT. © 2008 American Institute of Physics.
• Ma, Y., Hao, Q., Poudel, B., Lan, Y., Yu, B., Wang, D., Chen, G., & Ren, Z. (2008). Enhanced thermoelectric figure-of-merit in p-type nanostructured bismuth antimony tellurium alloys made from elemental chunks. Nano Letters, 8(8), 2580-2584.
• Poudel, B., Hao, Q., Ma, Y., Lan, Y., Minnich, A., Yu, B., Yan, X., Wang, D., Muto, A., Vashaee, D., Chen, X., Liu, J., Dresselhaus, M. S., Chen, G., & Ren, Z. (2008). High-thermoelectric performance of nanostructured bismuth antimony telluride bulk alloys. Science, 320(5876), 634-638.
• Wang, W., Yan, X., Poudel, B., Ma, Y., Hao, Q., Yang, J., Chen, G., & Ren, Z. (2008). Chemical synthesis of anisotropic nanocrystalline Sb ₂Te ₃ and low thermal conductivity of the compacted dense bulk. Journal of Nanoscience and Nanotechnology, 8(1), 452-456.
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  PMID: 18468102;Abstract: We describe a one-step, one-pot non-aqueous route for the synthesis of Sb 2Te 3 nanocrystals with hexagonal shape and highly anisotropic nanostructures. The as-prepared nanostructures were characterized by XRD, TEM and HRTEM. The effect of the stabilizers on the nanocrystal morphology has been discussed in detail. We have studied the thermal conductivity of the compacted bulk from the Sb 2Te 3 nanostructures. The results indicated that a very low thermal conductivity of about 1 W/mK at 300 K, comparing to 4.7 W/mK of the polycrystalline bulk, was achieved. The results indicated that nanostructured Sb 2Te 3 is potentially a good candidate for engineered nanocomposites that can lead to high thermoelectric figure-of-merit. Copyright © 2008 American Scientific Publishers All rights reserved.
• He, Q., Hao, Q., Chen, G., Poudel, B., Wang, X., Wang, D., & Ren, Z. (2007). Thermoelectric property studies on bulk TiOx with x from 1 to 2. Applied Physics Letters, 91(5), 052505.
• Yu, C., Hao, Q., Saha, S., Shi, L., Kong, X., & Wang, Z. L. (2005). Integration of metal oxide nanobelts with microsystems for nerve agent detection. Applied Physics Letters, 86(6), 1-3.
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  Abstract: We have assembled tin dioxide nanobelts with low-power microheaters for detecting dimethyl methylphosphonate (DMMP), a nerve agent simulant. The electrical conductance of a heated nanobelt increased for 5% upon exposure to 78 parts per billion DMMP in air. The nanobelt conductance recovered fully quickly after the DMMP was shut off, suggesting that the single-crystal nanobelt was not subject to poisoning often observed in polycrystalline metal oxide sensors. While the sensitivity can be improved via doping nanobelts with catalytic additives, directed assembly or growth of nanobelts on microsystems will potentially allow for the large-scale fabrication of nanosensor arrays. © 2005 American Institute of Physics.
• Choongho, Y. u., Hao, Q., Shi, L., Kang, D., Kong, X., & Wang, Z. L. (2004). Directed assembly of metal oxide nanobelts with microsystems into integrated nanosensors. American Society of Mechanical Engineers, Electronic and Photonic Packaging, EPP, 4, 543-547.
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  Abstract: Single-crystalline tin dioxide (SnO2) nanobelts have been assembled with microfabricated suspended heaters as low-power, sensitive gas sensors. With less than 4 mW power consumption of the micro-heater, the nanobelt can be heated up to 500°C. The electrical conductance of the heated nanobelt was found to be highly stable and sensitive to toxic and inflammable gas species including dimethyl methyl phosphonate (DMMP), nitrogen dioxide (NO2), and ethanol. The experiment is a step towards the large scale integration of nanomaterials with microsystems, and such integration via a directed assembly approach can potentially enable the fabrication of low-power, sensitive, and selective integrated nanosensor systems. Copyright © 2004 by ASME.
• Choongho, Y. u., Hao, Q., Shi, L., Kong, X., & Wang, Z. L. (2004). Integration of metal-oxide nanobelts with microsystems for sensor applications. Proceedings of SPIE - The International Society for Optical Engineering, 5593, 144-151.
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  Abstract: Single-crystalline tin dioxide (SnO 2) nanobelts have been assembled with microfabricated suspended heaters as low-power, sensitive gas sensors. With less than 4 mW power consumption of the micro-heater, the nanobelt can be heated up to 500°C. The electrical conductance of the heated nanobelt was found to be highly stable and sensitive to toxic and inflammable gas species including dimethyl methyl phosphonate (DMMP), nitrogen dioxide (NO 2), and ethanol. The experiment is a step towards the large scale integration of nanomaterials with microsystems, and such integration via a directed assembly approach can potentially enable the fabrication of low-power, sensitive, and selective integrated nanosensor systems.
• Hao, Q. (2004). Analytical heat-transfer modeling of multilayered microdevices. Journal of Micromechanics and Microengineering, 14(7), 914-926.
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  Abstract: In this paper, we present a general analytical modeling of the steady-state temperature distribution within a two-dimensional multilayered structure heated by arbitrary multi-heaters. Possible heat flux distributions on the heater-layer interface are discussed in detail. For a double-layer device, the selection of these distributions shows negligible influence on the total energy consumption and the average temperature across each heater-layer interface. The effects of the heat conduction inside the heaters are investigated according to the heater-layer thermal conductivity contrast and the thickness-to-width aspect ratio of heaters. Based on this model, we have developed a new method that can directly compute the electricity input powers to maintain required temperatures in specified regions. The cross talk within the heater array can be easily evaluated with this method. Moreover, its application in the thermal design of microfluidic devices is demonstrated by analyzing the experimental results in [2]. The linear relationship between the temperatures of the microchannel and corresponding heater is proven with our analytical model. The solution is also extended to structures with arbitrary embedded thin-film heaters and utilized to evaluate the surface temperature linearity of a microdevice with thin-film heaters that are covered with an insulating SiO2 layer.
• Shi, L., Hao, Q., Choongho, Y. u., Mingo, N., Kong, X., & Wang, Z. L. (2004). Thermal conductivities of individual tin dioxide nanobelts. Proceedings of the ASME Heat Transfer/Fluids Engineering Summer Conference 2004, HT/FED 2004, 4, 457-461.
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  Abstract: We have measured the thermal conductivities of a 53-nm-thick and a 64-nm-thick tin dioxide (SnO 2) nanobelt using a microfabricated device in the temperature range of 80-350 K. The uncertainty of the measurement result was estimated to be 10 percent. The thermal conductivities of the nanobelts were found to be significantly lower than the bulk values, and agree with our calculation results using a full dispersion transmission function approach. Comparison between measurements and calculation suggests that phonon-boundary scattering is the primary effect determining the thermal conductivities. Copyright © 2004 by ASME.
• Shi, L., Hao, Q., Yu, C., Mingo, N., Kong, X., & Wang, Z. L. (2004). Thermal conductivities of individual tin dioxide nanobelts. Applied Physics Letters, 84(14), 2638-2640.
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  Abstract: The thermal conductivities of a 53-nm-thick and a 64-nm-thick tin dioxide (SnO 2) nanobelt was measured using a microfabricated device in the temperature range of 80-350 K. The sample was kept in an evacuated continuous flow liquid-helium cryostat during the measurement. It was observed that the thermal conductivities of the nanobelts were strongly suppressed compared to the bulk values. It was shown that a dc current (I) was supplied to one Pt serpentine to raise the temperature of the membrane supporting the serpentine.
• Zhang, Y., Hu, X., Hao, Q., & Wang, X. (2003). Convective heat transfer enhancement of laminar flow of latent functionally thermal fluid in a circular tube with constant heat flux: Internal heat source model and its application. Science in China, Series E: Technological Sciences, 46(2).
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  Abstract: This paper analyzes the convective heat transfer enhancement mechanism of latent heat functionally thermal fluid. By using the proposed internal heat source model, the influence of each factor affecting the heat transfer enhancement of laminar flow in a circular tube with constant heat flux is analyzed. The main influencing factors and the mechanisms of heat transfer enhancement are clarified, and the influences of the main factors on the heat transfer enhancement are quantitatively analyzed. A modified Nusselt number for internal flow is introduced to describe more effectively the degree of heat transfer enhancement for latent functionally thermal fluid.
• Deyu, L. i., Majumdar, A., Jang, W., Yao, Z., Kim, P., Kim, D., Choongho, Y. u., Hao, Q., & Shi, L. (2002). Thermal property measurements of nanotubes, nanowires, and nanobelts. ASME International Mechanical Engineering Congress and Exposition, Proceedings, 2, 199-201.
• Deyu, L. i., Majumdar, A., Kim, P., Jang, W., Yao, Z., Kim, D., Choongho, Y. u., Hao, Q., & Shi, L. (2002). Thermal property measurements of nanotubes, nanowires, and nanobelts. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 372(2), 199-201.
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  Abstract: The thermal properties of Ge nanowires, SnO2 nanobelts and single wall (SW) carbon nanotubes (CNT) were measured in the temperature range of 4.2 to 400 K. The microdevice used for measuring consisted of two SiN x membranes each suspended by five 400-μm-long SiNx beams. To grow SWCNT's bridging the two membranes chemical vapor deposition (CVD) method was employed. The results show that due to the unique crystalline structure, boundary scattering is nearly absent in CNT's, giving rise to super high thermal and electrical conductivity.
• Zhou, J., Choongho, Y. u., Hao, Q., Kim, D., & Shi, L. (2002). Nanoscale quantitative thermal imaging of electronic devices. ASME International Mechanical Engineering Congress and Exposition, Proceedings, 7, 23-29.
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  Abstract: This paper investigates a new method for quantitative nanoscale thermal imaging of electronic devices. Different from previous works that utilized a thermal sensor fabricated on a scanning probe to obtain surface thermal images, the current approach employs a tunneling thermocouple made of a metal tip and an ultra-thin metal film deposited on the sample surface. The metal tip has a negligible Seebeck coefficient; while the metal film can be Bi 2Te3 or a semiconducting polymer that has very high Seebeck coefficient and low thermal conductivity. Unlike the probe with a built-in thermal sensor, the measured thermoelectric voltage by the tunneling thermocouple is not affected by the tip-sample contact thermal resistance and air conduction, allowing quantitative temperature measurement with a spatial resolution limited by the metal film thickness, which can be 10-20 nm. We have tested the new approach using Ir or Pt-Ir -coated atomic force microscope (AFM) tips to obtain the surface temperature profiles of interconnect structures coated with a thin Cr film. The measured surface temperature gradient is larger and the maximum measured temperature is 60% higher than the corresponding values obtained by a thermal probe with a builtin thermocouple fabricated at the tip end. The two thermal imaging methods are currently being used to measure temperature distribution on the cross section of a 130 nm-technology silicon-on-insulator field-effect transistor. Copyright © 2002 by ASME.
• Zhou, J., Choongho, Y. u., Hao, Q., Kim, D., & Shi, L. (2002). Nanoscale quantitative thermal imaging of electronic devices. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 372(7), 23-29.
  More info

  Abstract: This paper investigates a new method for quantitative nanoscale thermal imaging of electronic devices. Different from previous works that utilized a thermal sensor fabricated on a scanning probe to obtain surface thermal images, the current approach employs a tunneling thermocouple made of a metal tip and an ultra-thin metal film deposited on the sample surface. The metal tip has a negligible Seebeck coefficient; while the metal film can be Bi 2Te3 or a semiconducting polymer that has very high Seebeck coefficient and low thermal conductivity. Unlike the probe with a built-in thermal sensor, the measured thermoelectric voltage by the tunneling thermocouple is not affected by the tip-sample contact thermal resistance and air conduction, allowing quantitative temperature measurement with a spatial resolution limited by the metal film thickness, which can be 10-20 nm. We have tested the new approach using Ir or Pt-Ir -coated atomic force microscope (AFM) tips to obtain the surface temperature profiles of interconnect structures coated with a thin Cr film. The measured surface temperature gradient is larger and the maximum measured temperature is 60% higher than the corresponding values obtained by a thermal probe with a built-in thermocouple fabricated at the tip end. The two thermal imaging methods are currently being used to measure temperature distribution on the cross section of a 130 nm-technology silicon-on-insulator field-effect transistor.

Proceedings Publications

• Hao, Q., Chen, Q., & Xiao, Y. (2021). Thermal Transport Study on Nanoslot-Patterned Thin Films. In 2021 20th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (iTherm).
• Hao, Q., Xu, D., & Zhao, H. (2017, April). Thermoelectric Performance Study of Graphene Antidot Lattices on Different Substrates. In 2017 MRS Spring Meeting & Exhibit, 1-6.
• Hao, Q., Xu, D., Xiao, Y., & Zhao, H. (2017, Oct). Nanostructures for Reduced Lattice Thermal Conductivity — Case Studies for Nanopores and Grain Boundaries. In 232nd ECS Meeting, 80, 67-75.
• Hao, Q., Zhao, H., & Xiao, Y. (2018, Dec). Multi-Length Scale Electro-Thermal Simulations of GaN High Electron Mobility Transistors. In 18th Conference on Compound and Semiconducting Materials, Microwave Devices, and Optoelectronic Devices in China.
• Hao, Q., Xiao, Y., & Zhao, H. (2016, Nov.). Analytical Model for Lattice Thermal Conductivity Predictions of Periodic Nanoporous Structures. In Proceedings of 2016 International Mechanical Engineering Congress and Exposition (IMECE) Conference, IMECE2016-65459.
• Hao, Q., & Zhao, H. (2015, Oct). Computation-Driven Materials Search for Thermoelectric Applications. In 228 ECS Meeting, 69, 11-16.
• Hao, Q., Xu, D., & Zhao, H. (2015, April). Systematic Studies of Periodically Nanoporous Si Films for Thermoelectric Applications. In 2015 MRS Spring Meeting and Exhibit, 1779, 27-32.
• Hao, Q., Zhao, H., & Lu, N. (2015, April). Broad Search of Better Thermoelectric Oxides via First-Principles Computations. In 2015 MRS Spring Meeting and Exhibit, 1774, 25-30.
• Tuo, M., Li, S., Xu, D., Liang, M., Zhu, Q., Hao, Q., & Xin, H. (2015, April). Linear and Nonlinear Microwave Characterization of CVD-Grown Graphene Using CPW Structure. In 9th European Conference on Antennas and Propagation, 1-2.
• Wang, K., Molina, E., Deghani, G., Xu, B., Li, P., Hao, Q., Lucas, P., Kassaee, M. H., Jeter, S. M., & Tejz, A. S. (2014, June 30-July 2). Experimental Investigation to the Properties of Eutectic Salts by NaCl-KCl-ZnC12 for Application as High Temperature Heat Transfer Fluids. In 8th International Conference on Energy Sustainability (ESFuelCell2014).
• Hao, Q., Li, M., Coleman, G. J., Li, Q., & Lucas, P. (2013, April). Glass-Oxide Nanocomposites as Effective Thermal Insulation Materials. In 2013 MRS Spring Meeting and Exhibit, 1558, mrss13-1558-z09-07.

Presentations

• Hao, Q. (2020, April). Thermal Measurements of Nanostructures. Guest lecture. Online lecture: Huazhong University of Science and Technology.
• Hao, Q. (2019, August). Electrothermal Simulations GaN Devices and Thermal Studies of Film-Wafer Bonding. Department seminar. Hong Kong University: Hong Kong University.
• Hao, Q. (2019, August). Electrothermal Simulations of Two- and Three-Dimensional Transistors Based on GaN. Department seminar. Shenzhen, China: Shenzhen University.
• Hao, Q. (2019, August). Thermoelectric Studies of Graphene Antidot Lattices and Nanoporous Thin Films. Department seminar. Shenzhen, China: Southern University of Science and Technology.
• Hao, Q. (2019, August). Thermoelectric Studies of Graphene Antidot Lattices and Nanoporous Thin Films. Department seminar. Wuhan City, Hubei Province, China: Huazhong University of Science and Technology Seminar.
• Hao, Q. (2019, December). Phonon Transport in Si Films with Patterned Periodic Nanopores or Nanoslots. Advanced Engineering Science (ES) Meeting. Shenzhen, China: Engineering Science Publisher.
• Hao, Q. (2019, December). Thermal Measurements of Nanostructures. Department seminar. Beijing Normal University, Beijing, China.
• Hao, Q. (2019, October). Phonon Transport in Nanoporous Si Films — From Periodic Nanopores to Nanoslots. 236th ECS Meeting. Atlanta, GA.
• Hao, Q. (2019, October). Thermoelectric Studies of Graphene Antidot Lattices and Nanoporous Thin Films. Department seminar. Georgia Institute of Technology.
• Hao, Q. (2019, October). Thermoelectric Studies of Graphene Antidot Lattices and Nanoporous Thin Films. Seminar. UC Riverside: Hosted by Prof. Alexander A. Balandin.
• Hao, Q., & Xiao, Y. (2019, July). Coupled Electron and Phonon Monte Carlo Simulations for Thermal Studies of GaN-Based Devices. 6th ASME International Conference of Micro/Nanoscale Heat and Mass Transfer. Dalian, China: ASME.
• Hao, Q., & Xiao, Y. (2019, June). Electrothermal Simulations of Two- and Three-Dimensional Transistors Based on GaN. 5th International Conference on Phononic Crystals/Metamaterials, Phonon Transport, Topological Phononics. Tucson, AZ.
• Hao, Q., Wang, S., Xu, D., Xiao, Y., & Chen, Q. (2019, July). Thermal Studies of a Si/Ge Interface Formed by Film-Wafer Bonding. 6th ASME International Conference of Micro/Nanoscale Heat and Mass Transfer. Dalian, China: ASME.
• Wu, X. W., Medina, F. J., Xu, D., Stolik, L., Wang, X., & Hao, Q. (2019, July). Experimental Study of Thermal Transport in Strained Silicon Thin Films. 6th ASME International Conference of Micro/Nanoscale Heat and Mass Transfer. Dalian, China: ASME.
• Xu, D., Tang, S., Du, X., & Hao, Q. (2019, April). Energy Sensitivity Studies of Charge-Carrier Scattering in Graphene Antidot Lattices. 2019 MRS Spring Meeting & Exhibit. Phoenix, AZ: MRS.
• Xu, D., Xiao, Y., Medina, F. J., & Hao, Q. (2019, April). Thermal Studies of Nanoporous Thin Films with Increased Periodic Nanopores. 2019 MRS Spring Meeting & Exhibit. Phoenix, AZ.
• Hao, Q. (2018, Dec). Thermoelectric Studies of Graphene Antidot Lattices and Comparable Nanoporous Thin Films. Department seminar. Beijing Normal University: Hosted by Prof. Ruiting Zheng.
• Hao, Q. (2018, Dec). Thermoelectric Studies of Graphene Antidot Lattices and Comparable Nanoporous Thin Films. Department seminar. Hong Kong University, The Chinese University of Hong Kong, Hong Kong University of Science and Technology.
• Hao, Q. (2018, Nov). Thermoelectric Studies of Graphene Antidot Lattices and Comparable Nanoporous Thin Films. Seminar at Birck Nanotechnology Center. Purdue University: Hosted by Prof. Ali Shakouri.
• Hao, Q. (2018, Nov). Thermoelectric Studies of Graphene Antidot Lattices and Comparable Nanoporous Thin Films. Seminar. Northwestern University: Hosted by Prof. G. Jeffrey Snyder.
• Hao, Q. (2018, Oct). Thermoelectric Studies of Graphene Antidot Lattices and Beyond. AiMES Conference. Cancun, Mexico: AiMES.
• Hao, Q. (2018, Oct). Thermoelectric Studies of Graphene Antidot Lattices and Comparable Nanoporous Thin Films. Department seminar. UCLA, Mechanical and Aerospace Engineering: Hosted by Prof. Yongjie Hu.
• Hao, Q., & Zhao, H. (2018, Nov). Multi-Length Scale Electrothermal Simulations of GaN-Based Field Effect Transistors. IMECE Conference. Pittsburgh, PA: ASME.
• Hao, Q., Xiao, Y., & Zhao, H. (2018, June). A Hybrid Electrothermal Simulation Technique for GaN-Based Planar and Fin Field Effect Transistors. 60th Electronic Materials Conference. UCSB: MRS.
• Wang, S., Xu, D., Xiao, Y., & Hao, Q. (2018, Nov). Thermal Characteristic Study on Si-Ge Heterostructure Interface Formed by Film-Wafer Bonding. IMECE Conference. Pittsburgh, PA: ASME.
• Xiao, Y., Hong, Z., Coleman, G. J., Zhao, H., Liang, R., Lucas, P., & Hao, Q. (2018, April). Thermal Studies of 3D Printing Using Laser Curing of Polymers. 2018 MRS Spring Meeting & Exhibit. Phoenix, AZ: MRS.
• Xu, D., Wang, S., & Hao, Q. (2018, April). Thermal Studies of Si-Ge Heterostructure Interfaces by Film-Wafer Bonding. 2018 MRS Spring Meeting & Exhibit. Phoenix, AZ: MRS.
• Xu, D., Wang, S., & Hao, Q. (2018, March). Thermal Studies of Si-Ge Heterostructure Interfaces by Film-Wafer Bonding. American Physical Society March Meeting. Los Angeles, CA: APS.
• Hao, Q., Xiao, Y., & Zhao, H. (2017, Dec). Multi-Length Scale Electro-Thermal Simulations of GaN-Based High Electron Mobility Transistors. 18th Conference on Compound and Semiconducting Materials, Microwave Devices, and Optoelectronic Devices in China. Xiamen, China.
• Hao, Q., Xu, D., Ruden, X., LeRoy, B., & Du, X. (2017, April). Thermoelectric Property Measurements of Graphene Antidot Lattices on Different Substrates. 2017 MRS Spring Meeting & Exhibit. Phoenix, AZ: MRS.
• Hao, Q., Xu, D., Xiao, Y., & Zhao, H. (2017, Oct). Nanostructures for Reduced Lattice Thermal Conductivity — Case Studies for Nanopores and Grain Boundaries. 232nd ECS Meeting. National Harbor, Maryland: ECS.
• Hao, Q., Xu, D., Zhao, H., Du, X., Ruden, X., & LeRoy, B. (2017, June). Transport Property Studies of Nanoporous Graphene and Si Thin Films. Collaborative Conference on Materials Research. Jeju Island, South Korea.
• Xu, D., Zhao, H., & Hao, Q. (2017, March). Film-Wafer Bonding for Thermal Studies of a Twist Si Grain Boundary. American Physical Society March Meeting. New Orleans, LA: APS.
• Zhao, H., Xiao, Y., & Hao, Q. (2017, April). Multi-Length Scale Coupled Phonon-Electron Monte Carlo Simulations of Three-Dimensional GaN Transistors. 2017 MRS Spring Meeting & Exhibit. Phoenix, AZ: MRS.
• Hao, Q. (2016, May). Multilength Scale Electro-Thermal Simulations of GaN-Based High Electron Mobility Transistors. The 3rd International Conference on Phononics and Thermal Energy Science. Xi'an, China: Xi'an Jiao Tong University.
• Hao, Q., & Xu, D. (2016, Jan.). Thermal Studies of Nanoporous Si Films Using 3-Omega Measurements. ASME Micro/Nanoscale Heat & Mass Transfer International Conference. Biopolis, Singapore: ASME.
• Hao, Q., Xiao, Y., & Zhao, H. (2016, Jan.). Multi-Length Scale Thermal Simulations of GaN-Based Devices. ASME Micro/Nanoscale Heat & Mass Transfer International Conference. Biopolis, Singapore: ASME.
• Hao, Q., Xiao, Y., & Zhao, H. (2016, Nov.). Coupled Phonon/Electron Monte Carlo Simulations of Three-Dimensional GaN Transistors. ASME’s IMECE Conference. Phoenix, AZ: ASME.
• Hao, Q., Xu, D., Zhao, H., & Xu, D. (2016, March). Experimental Studies of Graphene Antidot Lattices for Thermoelectric Applications. American Physics Society March Meeting. Baltimore, MD: APS.
• Hao, Q., Xu, D., Zhao, H., Du, X., Ruden, X., & LeRoy, B. J. (2016, Nov.). Thermoelectric Property Measurements of Graphene Antidot Lattices on Different Substrates. ASME’s IMECE Conference. Phoenix, AZ: ASME.
• Hao, Q., Zhao, H., & Xiao, Y. (2016, July). Multi-Length Scale Electron-Thermal Simulations of GaN High Electron Mobility Transistors. Fourth International Conference on Computational Methods for Thermal Problems. Georgia Tech.
• Xu, D., Zhao, H., & Hao, Q. (2016, March). Thermal Investigations of Periodically Nanoporous Si Films — The Impact of Structure Sizes and Pore-Edge Amorphization. American Physics Society March Meeting. Baltimore, MD: APS.
• Zhao, H., & Hao, Q. (2016, March). Thermal Investigation of Nanostructured Bulk Thermoelectric Materials with Hierarchical Structures — An Effective Medium Approach. MRS Spring Meeting & Exhibit.. Phoenix, AZ.
• Hao, Q., & Zhao, H. (2015, May). Broad Search of Better Thermoelectric Oxides for High-Temperature Energy Harvesting. 2015 EMN Phuket Meeting. Thailand.
• Hao, Q., Segal, E. R., & Chan, C. K. (2014, July 4). Heat Generation an Conduction Studies of Li-ion Batteries. Sustainable Industrial Provessing Summt and Echitition, Shechtman International Symposium. Cancun, Mexico.
• Hao, Q., Segal, E. R., Xu, D., Coleman, G. J., & Lucas, P. (2014, April 21-25). ZT Enhancement of Thermoelectric Glasses via Annealing Combined with In-situ Thermoelectric Property Measurements. Spring Meeting. San Francisco, CA: MRS.
• Lucas, P., Coleman, G., & Hao, Q. (2014, May 25-30). Chalcogenide Glass Nanocomposites as Effective Thermal Insulation Materials. 1st Joint Meeting of Dgg-ACerS GOMD. Aachen, Germany.
• Lucas, P., Coleman, G., Gulbiten, O., Hao, Q., Bureau, B., Cui, S., & Boussard-Pledel, C. (2014, May 25-30). Doped Glassy Semiconductors for Application in Thermoelectric Devices. 1st Joint Meeting of DGG-ACerS GOMD. Aachen, Germany.
• Hao, Q., Coleman, G. J., & Lucas, P. (2013, Oct). In-situ thermoelectric property measurements for ZT enhancement of glassy materials by annealing. International Conference and Exhibition on Mechanical & Aerospace Engineering. San Antonio, TX.
• Hao, Q., Li, M., Li, Q., Coleman, G. J., & Lucas, P. (2013, Dec). In-situ Thermoelectric Property Measurements for ZT Enhancement of Glassy Materials by Annealing. 4th Micro/Nanoscale Heat & Mass Transfer International Conference. Hong Kong: ASME.
• Hao, Q., Li, M., Li, Q., Coleman, G. J., & Lucas, P. (2013, Nov). Nano-Grained Bulk Glass as Effective Thermal Insulation Materials. International Mechanical Engineering Congress and Exposition. San Diego, CA: ASME.
• Hao, Q., Segal, E. R., Li, M., & Li, P. (2013, Nov). Density Measurements of Eutectic Molten Salt Mixtures as Future High-temperature Heat Transfer Fluids. International Mechanical Engineering Congress and Exposition. San Diego, CA: ASME.
• Hao, Q., Segal, E. R., Li, M., & Wang, Y. (2013, Nov). Thermal Conductivity Measurements of Lithium-Ion Battery Cathodes. International Mechanical Engineering Congress and Exposition. San Diego, CA: ASME.
• Hao, Q., Xu, D., Li, M., Gnanaprakasa, T. J., Deymier, P., & Muralidharan, K. (2013, Dec). Thermal Investigation of Graphene Antidot Lattices towards Thermoelectric Applications. ASME 4th Micro/Nanoscale Heat & Mass Transfer International Conference. Hong Kong: ASME.
• Li, P., Chan, C., Hao, Q., Deymier, P. A., Lucas, P., Muralidharan, K., Gervasio, D. F., Momayez, M., Jeter, S. M., Teja, A. S., & Kannan, A. M. (2013, April). Halide and Oxy-halide Eutectic Systems for High Performance High Temperature Heat Transfer Fluids. Concentrating Solar Power Program Workshop. Phoenix, AZ: DOE.
• Hao, Q. (2012, July). Frequency-Dependent Monte Carlo Simulations of Phonon Transport in SiGe Nanocomposites. 14th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2012). Ann Arbor.
• Hao, Q., Sklan, S. R., Grossman, J., & Cedar, G. (2012, March). Effective Medium Approach for Frequency-Dependent and Frequency-Independent Phonon Transport Analysis of Polycrystals. ASME 2012 3rd Micro/Nanoscale Heat & Mass Transfer International Conference. Atlanta, GA: ASME.

Poster Presentations

• Hao, Q., & Xu, D. (2017, Aug). Thermoelectric Studies of Graphene Antidot Lattices on Substrates. 36th International Conference on Thermoelectrics. Pasadena, CA: ITS.
• Hao, Q., Xu, D., Zhao, H., & Xiao, B. (2017, Aug). Film-Wafer Bonding for Thermal Studies of a Twist Si Grain Boundary. 36th International Conference on Thermoelectrics. Pasadena, CA: ITS.