报告题目：

Nanostructured Materials for Thermoelectric

Energy Conversion

报告人:           Prof.  Dongyan Xu

香港中文大学，机械和自动化工程系    

时间：2014年1月3日(周五)  9:00               

地点：中国科学院力学研究所344会议室

报告摘要：

Thermoelectric energy conversion is an appealing approach for waste heat recovery by directly converting heat to electricity.  However, its widespread application is currently limited by the low efficiency.  In the past decade, the ability to create nanostructured thermoelectric materials has led to remarkable progress in enhancing thermoelectric efficiency primarily through thermal conductivity reduction.  In this talk, I will introduce two types of nanostructured thermoelectric materials we have been working on: (1) Metal-semiconductor nanocomposites; (2) Boron-based one-dimensional nanostructures.  I will mainly focus on thermal transport study in these materials. By epitaxially incorporating RE-V semi-metal nanostructures into IIIV semiconductors, we have demonstrated that metal-semiconductor nanocomposites have a significantly reduced thermal conductivity compared with the pure IIIV semiconductors.  We have been working on both n-type and p-type nanocomposite materials.  A thermoelectric figure-of-merit (ZT) of 1.3 has been reported for an n-type 0.6% ErAs:InGaAlAs nanocomposite at a moderate high temperature of 800 K. On the other hand, we are also working on thermal conductivity characterization of boron-based one-dimensional nanostructures.  Boron carbide has been projected to be promising high temperature thermoelectric materials. Thermal transport study in boron-based nanostructures could potentially lead to a new class of high performance thermoelectric materials. 

报告人简介：

Dr. Dongyan Xu received her B.Eng., M.Eng., and D.Eng. degrees from the Department of Engineering Mechanics at Tsinghua University in 1998, 2004, and 2004, respectively. She received her Ph.D. degree from the Department of Mechanical Engineering at Vanderbilt University in 2008. After that, she worked as a Postdoc Fellow in the Department of Mechanical Engineering at the University of California, Berkeley for two years. She joined the Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, in 2010, where she currently is an Assistant Professor. Her research interests include thermoelectrics, thermal management, nanoscale heat transfer, energy conversion and storage, and micro/nanofluidics.

报告联系人：沈楠  (office@lnm.imech.ac.cn 82543935)