Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-07-13
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
17 pagese, 3 figures, and supporting information (4 pages, 3 figures); Nano Letters, 2011
Scientific paper
10.1021/nl201488g
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 -8.0x10^{-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.
Cheong Heonsik
Son Young-Woo
Yoon Duhee
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