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• W3087127961 abstract "We report a joint study, using Raman micro-spectroscopy and molecular dynamics simulations, on the substrate effect on thermal properties of 2D materials and revisit measurement of thermal expansion coefficient (TEC) of supported 2D film. Graphene is employed as a representative. We find that the out-of-plane coupling between graphene and substrate strongly affects the temperature-dependent vibrational modes and TEC of graphene. Density of states for long-wavelength out-of-plane oscillations is significantly reduced when graphene is supported on an alkane substrate. To account for the contribution of the out-of-plane coupling to TEC, a Raman micro-spectroscopic scheme is developed. The TEC of graphene on octadecyltrichlorosilane substrate is found to be (-0.6+-0.5)*10-6/K at room temperature, which is fundamentally smaller than that of free-standing graphene. Our results shed light on the understanding of the interaction between 2D material and substrate, and offer a general recipe for optical measurement of TEC of a supported 2D film." @default.
• W3087127961 created "2020-09-25" @default.
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• W3087127961 date "2020-09-21" @default.
• W3087127961 modified "2023-09-27" @default.
• W3087127961 title "Study of Thermal Expansion Coefficients of 2D Materials via Raman Micro-spectroscopy: Revisited" @default.
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• W3087127961 hasPublicationYear "2020" @default.
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