Experimental Study on Thermal Boundary Resistance of Nanomaterials

采用由碳纳米管和悬浮铂热膜组成的新型纳米热探针，测量了单个碳纳米管（CNT）与Au、Pt、SiO2表面之间的热边界电阻（TBR）。采用了封闭和开放式碳纳米管，得到了相似的各向异性碳基材料趋势。然而，测量的TBR比报道的结果要低得多，并且与材料无关，这与声子不匹配模型不一致。我们的数据表明，当范德华力在界面处占主导地位时，现有的声子模型不适用。另一项使用CNTs块状球团的实验也证实了在高于100K的温度范围内的不一致性，这表明高频声子无法通过这种弱键界面。利用该热探针成功研制了纳米尺度点接触定量温度传感系统。

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.