Duan Xiaojie, Son Hyungbin, Gao Bo, Zhang Jin, Wu Tianjiao, Samsonidze Georgy G, Dresselhaus Mildred S, Liu Zhongfan, Kong Jing
Centre for Nanoscale Science and Technology, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
Nano Lett. 2007 Jul;7(7):2116-21. doi: 10.1021/nl0711155. Epub 2007 Jun 14.
Resonance Raman spectra of individual strained ultralong single-wall carbon nanotubes (SWNTs) are studied. Torsional and uniaxial strains are introduced by atomic force microscopy manipulation. Torsional strain strongly affects the Raman spectra, inducing a large downshift in the E2 symmetry mode in the G+ band, but a slight upshift for the rest of the G modes and also an upshift in the radial breathing mode (RBM). Whereas uniaxial strain has no effect on the frequency of either the E2 symmetry mode in the G+ band or the RBM, it downshifts the rest of the G modes. The Raman intensity change reflects the effect of these strains on the SWNT electronic band structure.
研究了单个应变超长单壁碳纳米管（SWNTs）的共振拉曼光谱。通过原子力显微镜操作引入扭转应变和单轴应变。扭转应变强烈影响拉曼光谱，导致G +带中E2对称模式出现大幅下移，但G模式的其余部分出现轻微上移，径向呼吸模式（RBM）也出现上移。而单轴应变对G +带中E2对称模式或RBM的频率均无影响，但会使G模式的其余部分下移。拉曼强度变化反映了这些应变对SWNT电子能带结构的影响。
