Temperature-dependent thermal properties of single-walled carbon nanotube thin films

Abstract

We herein report the determination of the intrinsic thermal conductivity (κ) and interfacial thermal conductance (g) of single-walled carbon nanotube thin films (50 nm) on top of a SiO2 substrate. The study was performed as a function of temperature (300–450 K) using the opto-thermal technique. The value of κ decreases nonlinearly by approximately 60% from a value of 26 Wm−1 K−1 at 300 K to a value of 9 Wm−1 K−1 at 450 K. This effect stems from the increase of multi-phonon scattering at higher temperatures. The g increases with temperature, reaching a saturation plateau at 410 K. These findings may contribute to a better understanding of the thermal properties of the supported carbon nanotube thin films, which are crucial for any heat dissipation applications.