The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, CAS
中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室·主办

　　国 家 重 点 实 验 室 特 邀 学 术 报 告

　　报告题目：Nanoscale Phonon Transport with Application in Thermoelectrics

　　报 告 人：Dr. Ming Hu (RWTH Aachen University, Germany)

　　报告时间：2014年3月24日（星期一）上午9:30

　　报告地点：2号楼607会议室

　　联系人：史  迅  2803 

　　Abstract Rapid progress in synthesis and processing of nanomaterials has created a pressing demand for greater scientific understanding of thermal (mainly phonons) transport at the nanoscale. Employing the related interweaving surface/interface and confinement phenomena, a key research paradigm of importance to energy conversion (thermoelectrics) will be discussed in this talk. Thermoelectric materials, which can generate electricity from waste heat, could play an important role in a global sustainable energy solution. Such a development is contingent on identifying materials with higher thermoelectric efficiency than available at present, which is a challenge owing to the conflicting combination of material traits that are required. Nanoscale and nanostructured materials are promising for increasing the figure of merit (ZT) of thermoelectric materials relative to the bulk, owing to miniaturization and nanostructuring that induces strong phonon scattering (such as phonon boundary or impurity scattering) and/or interfacial phonon interference. In this talk, I will present some novel concepts of material nanostructuring (in particular one-dimensional nanowires) and demonstrate how we significantly hinder the heat conduction in a controlled manner so that materials with very low thermal conductivity can be nanofabricated. These results exemplify opportunities and challenges of nanoengineering in nanoscale thermal transport and provide a new perspective to innovative energy conversion. At the end of the talk, I will also discuss some newly emerging concepts of advanced thermoelectrics, such as phonon liquid nanostructuring and reducing lattice thermal conductivity by all-scale hierarchical phonon manipulation.

　　欢迎广大科研人员和研究生参与讨论！