Experimental Study on Thermal Boundary Resistance of Nanomaterials

利用一种由碳纳米管（CNT）和悬浮铂热膜组成的新型纳米热探针，测量了单个CNT与Au、Pt、SiO2表面之间的边界热阻（TBR）。封闭和开放端的碳纳米管都被使用，并且获得了类似的各向异性碳基材料的趋势。然而，测得的TBR被发现远低于报告的结果和独立的材料，这是不符合声子失配模型。我们的数据表明，现有的声子模型不适用时，货车范德华力占主导地位的界面。另一个使用块状碳纳米管颗粒的实验也证实了在高于100K的温度范围内的不一致性，这表明高频声子不能穿过这种弱键合界面。利用该探针还成功地研制了纳米级点接触的定量温度传感系统。

The thermal boundary resistance (TBR) between an individual carbon nanotube (CNT) and Au, Pt, SiO2 surfaces was measured by using a new nano thermal probe consisting of a CNT and a suspended platinum hot-film. Both closed and open-ended CNTs were used and a similar trend of anisotropic carbon-based materials was obtained. However, the measured TBR were found much lower than the reported results and independent of the materials, which is inconsistent with the phonon mismatch model. Our data indicate the inapplicability of existing phonon models when van der Waals forces are dominant at the interfaces. Another experiment using bulk pellet of CNTs also confirmed the inconsistency in the temperature range higher than 100K, which suggests that the phonons of high frequency cannot go through such weak-bonded interface. Quantitative temperature sensing system at the nanoscale point contact was also successfully developed using the thermal probe.