共振增强拉曼光谱技术在单壁碳纳米管表征中的应用  

Application of Resonance Raman Spectroscopy in the Characterization of Single-Walled Carbon Nanotubes

作　　者：张莹莹[1] 张锦[2] 

机构地区：[1]清华大学微纳米力学与多学科交叉创新研究中心,北京100084 [2]北京大学纳米化学研究中心北京大学化学与分子工程学院,北京100871

出　　处：《化学学报》2012年第22期2293-2305,共13页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.51121091;50972001;21203107);科技部(No.2011CB932601)资助~~

摘　　要：共振增强拉曼光谱技术是表征和研究单壁碳纳米管(SWNTs)的有力工具,它既能用于SWNTs的几何结构表征,又能反映SWNTs的电子态密度信息.特别指出的是,由于共振拉曼效应,它能够灵敏地检测单根SWNT的局域信息.本文首先概述了SWNTs拉曼光谱的RBM峰、G峰、D峰和G'峰的特征和应用,然后综述了共振增强拉曼光谱在SWNTs的结构表征、形变测量、缺陷测量和温度测量中的应用和进展,最后讨论了共振拉曼光谱在SWNTs表征方面所面临的机会和挑战.Resonance enhanced Raman spectroscopy is a simple,quick,non-destructive and powerful tool for the characterization of single-walled carbon nanotubes（SWNTs）.Raman spectroscopy can be used to obtain information about both the geometry structure and the electronic density of states of SWNTs,including isolated individual SWNTs.In this review,the characteristics of the main Raman active modes of SWNTs,including radial breath mode（RBM）,G-band,D-band and G＇-band were stated,and the application of Raman spectroscopy in the characterization of the diameter and chirality of SWNTs,strained SWNTs,defects and doping in SWNTs,and the temperature-dependence of the structures of SWNTs were summarized.The diameter of SWNTs can be calculated from the frequency of RBM（ωRBM）,according to an equation which is slightly varied with the type of SWNT samples.Furthermore,by combining the Raman resonance condition,ωRBM and Kataura plot,both information of electronic conducting properties,electron transition energy,and（n,m） of SWNTs could be obtained.With application of uniaxial strain,the D-band,G-band and G＇-band of SWNTs shift due to the change of C—C distance,according to which the strain applied on SWNTs can be measured.At the same time,the Raman resonance intensity varies,which is attributed to the influence of uniaxial strain on the electronic structure of SWNTs.Raman spectroscopy can also be used to characterize radial deformation of SWNTs.It is found that the variation of frequency and intensity of RBM with the application of radial deformation shows dependence on the diameter and chirality of SWNTs.Theoretically,G-band will change under bending deformation,while experimental verification is still in needs due to difficulties of bend deformation of SWNTs in experiments.Besides,Raman spectra of SWNTs can be used to monitor the temperature of SWNTs due to the sensentivity of Raman spectra to photon properties.The Raman spectra of SWNTs upshift with the increase of temperature and the Raman resonance intensity

关 键 词：单壁碳纳米管 共振增强拉曼光谱 形变 缺陷 温度效应 

分 类 号：O613.71[理学—无机化学] TB383.1[理学—化学]