The thermal conductivity of suspended single-layer graphene was measured as afunction of temperature using Raman scattering spectroscopy on clean samplesprepared directly on a prepatterned substrate by mechanical exfoliation withoutchemical treatments. The temperature at the laser spot was monitored by thefrequency of the Raman 2$D$ band of the Raman scattering spectrum, and thethermal conductivity was deduced by analyzing heat diffusion equations assumingthat the substrate is a heat sink at ambient temperature. The obtained thermalconductivity values range from $\sim$1800 Wm$^{-1}$K$^{-1}$ near 325 K to$\sim$710 Wm$^{-1}$K$^{-1}$ at 500 K.
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机译：在未经化学处理的情况下，通过机械剥落直接在预先构图的基材上制备的干净样品上，使用拉曼散射光谱法测量悬浮的单层石墨烯的导热系数随温度的变化。通过拉曼散射光谱的拉曼2 $ D $带的频率来监测激光点处的温度，并通过假设衬底在环境温度下为散热器来分析热扩散方程来推导热导率。获得的热导率值范围从325 K附近的$ \ sim $ 1800 Wm $ ^ {-1} $ K $ ^ {-1} $到$ \ sim $ 710 Wm $ ^ {-1} $ K $ ^ {-1} $在500 K
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