碳纳米管的拉曼光谱及其温度效应

Raman Spectra of Carbon Nanotubes and Their Temperature Effect

在室温下首次观察到碳纳米管的四级拉曼光谱，并且发现碳纳米管的Ｄ峰和Ｄ＊峰的斯托克斯线和反斯托克斯线频率不一致。此外，还发现碳纳米管的拉曼特征峰频率严重依赖样品的温度，随着温度增加，碳纳米管拉曼特征峰频率下移，频移与温度变化成线性关系。

We present the first report of fourth order Raman peaks of carbon nanotubes at room temperature. An unusual discrepancy between the frequency of the Stokes and anti Stokes peaks of the D and D * mode is found. Furthermore, we observe a temperature dependence of the frequency of all the major peaks in the Raman spectra of carbon nanotubes and active carbon, using different excitation laser powers at the sample. The frequency decreases linearly with increasing temperature for all peaks, but by different amounts. The origin of this temperature dependence is not clear but may be due to the nanoscale features of carbon nanotubes and active carbon.