title: Negative thermal expansion coefficient of graphene measured by Raman spectroscopy.
abstract: The thermal expansion coefficient (TEC) of single-layer graphene is estimated with temperature-dependent Raman spectroscopy in the temperature range between 200 and 400 K. It is found to be strongly dependent on temperature but remains negative in the whole temperature range with a room temperature value of (-8.0 ± 0.7) × 10(-6) K(-1). The strain caused by the TEC mismatch between graphene and the substrate plays a crucial role in determining the physical properties of graphene, and hence its effect must be accounted for in the interpretation of experimental data taken at cryogenic or elevated temperatures.
authors: Department of Physics, Sogang University, Seoul 121-742, Korea.
authors: Duhee
authors: D
authors: Yoon
authors: Young-Woo
authors: YW
authors: Son
authors: Hyeonsik
authors: H
authors: Cheong