【摘要】 研究了单根(7,5)蛇形单壁碳纳米管的拉曼光谱特征,观察到了环呼吸振动峰(RBM)、环呼吸振动的倍频峰(2RBM)、介于中间频率的振动峰(IMF)、无规振动峰(D)、剪切振动峰(G)、中间频率振动峰(M)、剪切振动和环呼吸振动的和频峰(G+RBM)、面内横向光学声子和纵向声学声子的和频峰(iTOLA)、无规振动的二次共振峰(G′或者2D)以及其它一些归属不清楚的拉曼峰.不同激发波长和不同激发偏振拉曼光谱研究表明,这些拉曼光谱峰显示出了非常强的激发能量和激发偏振的选择性.更多还原

【Abstract】 We carried out Raman characterization of a highly folded individual serpentine (7,5) single-walled carbon nanotube (SWNT).Twenty five Raman peaks were observed,which included a radial breathing mode (RBM band),an overtone of RBM (2RBM band),an immediate-frequency band (IMF band),a disorder-induced band (D band),a tangential band (G band),an M band (1700-1900 cm-1),a combination mode of G and RBM (G+RBM band),a combination mode of in-plane transverse optic (iTO) phonon and longitudinal acoustic (LA) phonon (iTOLA band),an overtone of the D band (G’ or 2D band),an overtone of the G band (2G band) and some other bands with unknown assignments.Further Raman measurements at different laser excitation wavelengths and different excitation polarization show that these Raman peaks are highly dependent on the excitation energy and the excitation polarization.更多还原