题 目：Heat Transfer in Low-Dimensional Materials
报告人：Prof. Ming Hu（RWTH Aachen University, Germany）
Rapid progress in synthesis and processing of nanomaterials has created a pressing demand for greater scientific understanding of thermal transport at the nanoscale. Employing the related interweaving surface/interface and confinement phenomena, a key research paradigm of importance to energy conversion and transport will be discussed in this talk. On the one hand, owing to miniaturization and nanostructuring, heat conduction can be significantly hindered in a controlled manner so that materials with very low thermal conductivity can be nanofabricated, which can be beneficial for energy conversion applications, e.g. in high efficiency thermoelectrics. In this talk, I will present some novel concepts of material nanostructuring (in particular one-dimensional nanowires) to significantly enhance their ZT coefficient. These results exemplify opportunities and challenges of nanoengineering in nanoscale thermal transport and provide a new perspective to innovative energy conversion. On the other hand, research on low-dimensional materials is driven both by fundamental scientific questions and the perspective of applications. In particular, recently there has been enormous progress in the production of atomic layers that are strictly two-dimensional (2-D) and can be viewed as individual planes of atomic-scale thickness pulled out of bulk materials like graphite, h-BN, and complex oxides. In the second part of this talk, I will talk about abnormal thermal transport in atomically thin silicon (silicene), the silicon counterpart of graphene, and demonstrate effect of size (length) and surface functionalization on its thermal transport properties.