Experimental Study on Thermal Boundary Resistance of Nanomaterials

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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.