Thermal conductivity of suspended pristine graphene measured by Raman spectroscopy

Abstract

The thermal conductivity of suspended single-layer graphene was measured as a function of temperature using Raman scattering spectroscopy on clean samples prepared directly on a prepatterned substrate by mechanical exfoliation without chemical treatments. The temperature at the laser spot was monitored by the frequency of the Raman 2$D$ band of the Raman scattering spectrum, and the thermal conductivity was deduced by analyzing heat diffusion equations assuming that the substrate is a heat sink at ambient temperature. The obtained thermal conductivity values range from $\sim$1800 Wm${}^{-1}$K${}^{-1}$ near 325 K to $\sim$710 Wm${}^{-1}$K${}^{-1}$ at 500 K.

4pages, 3 figures

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