Thermal Conductivity and Phonon Transport in Suspended Few-Layer Hexagonal Boron Nitride
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- 作者：Insun Jo ; Michael Thompson Pettes ; Jaehyun Kim ; Kenji Watanabe ; Takashi Taniguchi ; Zhen Yao ; Li Shi
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：February 13, 2013
- 年：2013
- 卷：13
- 期：2
- 页码：550-554
- 全文大小：333K
- 年卷期：v.13,no.2(February 13, 2013)
- ISSN：1530-6992
文摘
The thermal conductivity of suspended few-layer hexagonal boron nitride (h-BN) was measured using a microbridge device with built-in resistance thermometers. Based on the measured thermal resistance values of 11鈥?2 atomic layer h-BN samples with suspended lengths ranging between 3 and 7.5 渭m, the room-temperature thermal conductivity of a 11-layer sample was found to be about 360 W m鈥? K鈥?, 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 W m鈥? K鈥? 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.