Down to Atomic-level Direct Thermal Probing and Energy Transport Characterization

讲座名称: Down to Atomic-level Direct Thermal Probing and Energy Transport Characterization
讲座时间 2017-04-26
讲座地点 东三楼东汽报告厅
讲座人 王信伟
讲座内容

应能动学院王秋旺教授邀请,美国依阿华州立大学机械工程系王信伟教授于将2017年4月25日到4月27日访问我校,并为全校师生做一场学术报告,欢迎大家积极参加。

讲座题目:Down to Atomic-level Direct Thermal Probing and Energy Transport Characterization
讲座时间:2017年4月26日下午3:00-5:00
讲座地点:东三楼东汽报告厅
邀请人:王秋旺教授
讲座摘要:Temperature is one of the most important physical parameters for characterizing and understanding thermal transport capacity of materials, looking into the physics behind photon-induced material processing, and unrevealing interface energy exchange/coupling. This talk will cover our new technology development and frontier research on thermal probing based on Raman scattering, a technology traditionally widely used for structure analysis. The Raman-based thermal probing in three areas will be covered. The first one is micro/submicron particle induced near-field effect. This phenomenon has been widely used in surface nanoscale structuring and imaging. For the first time, we have accomplished experimental study on nanoscale mapping of particle-induced thermal, stress, and optical fields under near-field excitation. The mapping provides consistent knowledge of conjugated thermal, stress, and near-field focusing at a 20 nm resolution. This represents a very exciting advance for far-field thermal probing of near-field thermal phenomenon with an ultra-high resolution. Particles as small as 160 nm can be clearly mapped employing this technique. The second area is near-field optical focusing by an atomic force microscope. A thermal probing resolution as small as 5 nm has been achieved. We have undertaken pioneering work on the near-filed thermal response, nonlinear optical absorption, and ballistic heat conduction around a region of a few nm. The third area is interface energy coupling between graphene and a substrate. A spatial resolution as good as 1~2 nm has been achieved. For the first time, we are able to distinguish the temperature difference between two materials a few nm apart. Interface energy, optical, and mechanical couplings will be reported. This provides one of the most advanced knowledge base about the physical behavior of graphene on a substrate. Our most recent advance has achieved energy state-resolved Raman to characterize electron diffusion and interface energy coupling of 2D atomic layer materials. This represents accurate characterization by eliminating the errors of laser absorption calculation and Raman properties temperature coefficient calibration.
 

讲座人介绍
讲座人简介:王信伟,普渡大学博士,美国依阿华州立大学机械工程系终身教授,主要从事微尺度材料领域前沿课题的研究,包括纳米结构对声子散射的分子动力学研究以及微米/纳米低维材料热物性的非接触非破坏性测量、基于拉曼散射的原子量级分辨率的温度测定和物体界面的能量耦合的测量等,开展了碳纳米管,纳米薄膜,微米材料和生物材料的传热特性及结构的研究。

 

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