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This article is cited in 9 scientific papers (total in 9 papers)
Graphenes
On Estimating the $G$-peak shift in graphene Raman spectra
S. Yu. Davydovab a Ioffe Institute, St. Petersburg
b St. Petersburg National Research University of Information Technologies, Mechanics and Optics
Abstract:
The frequency shift of the Raman $G$ peak of epitaxial graphene due to the interaction with a substrate described by effective bond force constant $k$ is investigated using the model of two coupled oscillators. The relative $G$-peak shift is shown to be $\Delta\omega(G)/\omega(G)\propto k/k_{0g}$, where $k_{0g}$ is the bond-stretching force constant of single-layer graphene. Assuming $k\propto P$ and $k\propto -T$, where $P$ and $T$ are the pressure and temperature, and the $k$ variation to be dominant, we qualitatively explain the experimental dependences of $\Delta\omega(G)$ on $P$ and $T$. The effect of the substrate on the $G$-peak broadening in epitaxial graphene is discussed.
Received: 24.05.2016
Citation:
S. Yu. Davydov, “On Estimating the $G$-peak shift in graphene Raman spectra”, Fizika Tverdogo Tela, 59:3 (2017), 610–613; Phys. Solid State, 59:3 (2017), 629–632
Linking options:
https://www.mathnet.ru/eng/ftt9659 https://www.mathnet.ru/eng/ftt/v59/i3/p610
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