Negative thermal expansion coefficient of graphene measured by Raman spectroscopy.

  title={Negative thermal expansion coefficient of graphene measured by Raman spectroscopy.},
  author={Duhee Yoon and Young-Woo Son and Hyeonsik Cheong},
  journal={Nano letters},
  volume={11 8},
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… CONTINUE READING
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