在不同激发波长下的单壁碳纳米管的拉曼光谱研究  

Raman Spectrum of SWNTs at Different Excitation Wavelengths

作　　者：陈林涛[1] 张振龙[1] 白莹[1] 王玉芳[2] 莫育俊[1] 

机构地区：[1]河南大学物理与信息光电子学院,开封475001 [2]南开大学物理科学学院,天津300071

出　　处：《高等学校化学学报》2005年第9期1665-1668,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:10274019);河南省自然科学基金(批准号:0211010100)资助.

摘　　要：采用直流电弧法制备单壁碳纳米管样品,用457·5和632·8nm两种不同的激发光分别测得单壁碳纳米管的正常拉曼光谱和共振拉曼光谱.通过理论分析得到了单壁碳纳米管的直径分布,进一步推测了其类型及结构参数;对单壁碳纳米管的正切拉伸模的成分进行了归属.在632·8nm激发波长下得到了IG/ID值随激光功率变化的曲线,认为在2·5mW时,单壁碳纳米管缺陷的结构可能发生了改变.在用457·5nm波长激发的单壁碳纳米管的拉曼光谱中,首次发现了1421cm-1的拉曼谱峰.The single-walled carbon nanotubes （SWNTs） Was synthesized by electric are discharge method, and the normal Raman and resonant Raman scattering spectra of SWNTs were measured at 457.5 and 632.8 nm laser excitation wavelengths. By theoretical analysis, the diameter distributions of SWNTs were obtained, the style and configuration parameter were speculated further. By a Lorentzian line-shape analysis of the spectral feature for G mode, the component of the tangential stretch mode of SWTNs was assigned. The variational curve of the value of IG/ID for its changing with the variation of the laser power was obtained under 632.8 nm excitation. Disfigurement structure of SWNTs have a variety when laser power is 2.5 mW. In the Raman scattering spectra of SWNTs under 457.5 nm excitation, the new Raman peak under 1 421 cm ^-1 is discovered for the first time.

关 键 词：单壁碳纳米管 拉曼光谱 共振 一维电子态密度 

分 类 号：O643.3[理学—物理化学]