NER: Experimental Investigation of Heat Transfer in Individual Nanowires/Tubes

纳米线/管有可能对微/纳米机械系统的尺寸继续缩小做出重大贡献。了解纳米线/管的热特性是预测、控制和实现微米和纳米尺寸器件所需热性能的基础。这项为期一年的探索性研究旨在开发一种新的实验表征工具来表征纳米线/管的热输运。拟议的实验包括在衬底的一侧进行调制激光加热，而在另一侧垂直生长纳米线/管。检测到来自激光加热侧的热辐射的变化，并与纳米线/管的热物理性质有关。该实验独特的热深度分布能力使得识别和表征纳米线/管的导热系数以及纳米线/管与衬底之间的接触热阻成为可能。这种接触热阻的定量研究是纳米线/管与微纳器件之间的连接热设计的第一步，也是必不可少的一步。

Nanowires/tubes have the potential to contribute significantly to the continued size reduction of micro/nano-mechanical systems. Knowledge of the thermal characteristics of nanowires/tubes is the basis for predicting, controlling, and achieving desired thermal performance of micro- and nanosized devices. This one-year exploratory research is to develop a novel experimental characterization tool to characterize the thermal transport along nanowires/tubes. The proposed experiment involves modulated laser beam heating on one side of a substrate while nanowires/tubes have been grown perpendicularly on the other side. Variation of the thermal radiation from the laser-heated side is detected and related to the thermophysical properties of nanowires/tubes. The unique thermal depth profiling capability of the experiment makes it possible to identify and characterize the thermal conductivity of nanowires/tubes and the thermal contact resistance between nanowires/tubes and the substrate. The quantitative investigation of this thermal contact resistance is a first step, also an essential step, toward the thermal design of joints between nanowires/tubes and micro- and nanodevices.