1302.1890 (Insun Jo et al.)

Thermal Conductivity and Phonon Transport in Suspended Few-Layer
Hexagonal Boron Nitride    [PDF]

Insun Jo, Michael Thompson Pettes, Jaehyun Kim, Kenji Watanabe, Takashi Taniguchi, Zhen Yao, Li Shi

The thermal conductivity of suspended few-layer hexagonal boron nitride (h-BN) was measured using a micro-bridge device with built-in resistance thermometers. Based on the measured thermal resistance values of 11-12 atomic layer h-BN samples with suspended length ranging between 3 and 7.5 um, the room-temperature thermal conductivity of a 11-layer sample was found to be about 360 Wm-1K-1, approaching the basal plane value reported for bulk h-BN. The presence of a polymer residue layer on the sample surface was found to decrease the thermal conductivity of a 5-layer h-BN sample to be about 250 Wm-1K-1 at 300 K. Thermal conductivities for both the 5 layer and the 11 layer samples are suppressed at low temperatures, suggesting increasing scattering of low frequency phonons in thin h-BN samples by polymer residue.

View original: http://arxiv.org/abs/1302.1890