Li Xiaoli, Liu Jian, Ding Kai, Zhao Xiaohui, Li Shuai, Zhou Wenguang, Liang Baolai
College of Physics Science & Technology, Hebei University, Baoding, 071002, People's Republic of China.
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, People's Republic of China.
Nanoscale Res Lett. 2018 Jan 17;13(1):25. doi: 10.1186/s11671-018-2444-2.
Thermal properties of sp systems such as graphene and hexagonal boron nitride (h-BN) have attracted significant attention because of both systems being excellent thermal conductors. This research reports micro-Raman measurements on the in-plane E optical phonon peaks (~ 1580 cm in graphene layers and ~ 1362 cm in h-BN layers) as a function of temperature from - 194 to 200 °C. The h-BN flakes show higher sensitivity to temperature-dependent frequency shifts and broadenings than graphene flakes. Moreover, the thermal effect in the c direction on phonon frequency in h-BN layers is more sensitive than that in graphene layers but on phonon broadening in h-BN layers is similar as that in graphene layers. These results are very useful to understand the thermal properties and related physical mechanisms in h-BN and graphene flakes for applications of thermal devices.
诸如石墨烯和六方氮化硼（h-BN）等sp系统的热性质因其均为优异的热导体而备受关注。本研究报告了在-194至200°C温度范围内，对平面内E光学声子峰（石墨烯层中约为1580 cm，h-BN层中约为1362 cm）进行的显微拉曼测量。h-BN薄片对温度依赖的频移和展宽表现出比石墨烯薄片更高的灵敏度。此外，h-BN层中c方向对声子频率的热效应比石墨烯层更敏感，但对h-BN层中声子展宽的热效应与石墨烯层相似。这些结果对于理解h-BN和石墨烯薄片的热性质及相关物理机制在热器件应用中非常有用。
