THERMAL CONDUCTIVITY MEASUREMENTS OF CHIRALITY-ASSIGNED SINGLE- WALLED CARBON NANOTUBES

2018.06.12

Yoshikazu Homma, Tokyo University of Science

Single-walled carbon nanotubes (SWCNTs) are expected to have high thermal conductivity along the tube axis. Although many experimental measurements of the thermal conductivity have been reported, the SWCNT structure was not characterized sufficiently. In particular, the chirality was not assigned, and it was not confirmed whether the SWCNT was isolated or not. Here, we measured the thermal conductivity of chirality-assigned SWCNTs, which were individually suspended, by using photoluminescence (PL) imaging spectroscopy. The temperature distribution along the tube axis was obtained, and the temperature dependence of the thermal conductivity was measured in a wide-temperature range (from 350 to 1000 K). For (9, 8) SWCNTs with 10−12 μm in length, the thermal conductivity was 1166 ± 243 W/(m·K) at 400 K. The proposed PL imaging spectroscopy enables to measure the thermal conductivity of SWCNTs with high precision and without any contacts, and it is an effective method in the temperature distribution measurements of nanomaterials.

[1] K. Yoshino, T. Kato, Y. Saito, J. Shitaba, T. Hanashima, K. Nagano, S. Chiashi, and Y. Homma, ACS Omega, 3, 4352-4356 (2018).