Author/Authors :
Zhou، نويسنده , , Zhenping and Ci، نويسنده , , Lijie and Song، نويسنده , , Li and Yan، نويسنده , , Xiaoqin and Liu، نويسنده , , Dongfang and Yuan، نويسنده , , Huajun and Gao، نويسنده , , Yan and Wang، نويسنده , , Jianxiong and Liu، نويسنده , , Lifeng and Zhou، نويسنده , , Weiya and Xie، نويسنده , , Sishen and Du، نويسنده , , Yinxiao and Mo، نويسنده , , Yujun، نويسنده ,
Abstract :
The temperature-dependent Raman shift of double-walled carbon nanotubes (DWNTs) has been investigated in detail. It was found that radial breathing mode (RBM) frequencies of DWNTs have a linear dependence on the sample temperature, but different RBM frequencies correspond to completely different temperature coefficients. The frequency-dependent temperature coefficient has been investigated and attributed to the intershell effect in DWNTs. In comparison, G-band of DWNTs has a nonlinear or second-order polynomial relation with the increased temperature. The deviation from the linear trend has been revealed to be due to the contribution of the third- and fourth-order anharmonic term in the lattice potential energy with pure temperature effect.
