Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, MOE Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China.
Chem Commun (Camb). 2009 Dec 7(45):6902-18. doi: 10.1039/b914588e. Epub 2009 Oct 7.
Due to remarkable rolling structure and distinct rolling direction, the chirality-dependent Raman spectra of single-walled carbon nanotubes (SWNTs) show two characteristic features: the radial breathing mode (RBM) and the G-band. Rich information about SWNTs presented by these Raman features makes Raman spectroscopy a general and common tool for characterizing structures and properties of SWNTs and their changes. When exerted by external forces, the geometrical structures of SWNTs will change, which further affects the electronic structures and phonon properties of SWNTs. In this article, emphasis is given to how Raman frequency and resonant-Raman intensity evolve under distinct strains, including uniaxial strain, torsional strain, radial deformation and bending deformation. It is found that depending on different structural variations, Raman spectra of SWNTs have different responses to each strain, showing that resonant-Raman spectroscopy is a suitable tool to characterize and study strains in SWNTs.
由于显著的滚转结构和独特的滚转方向，单壁碳纳米管（SWNTs）的手性相关拉曼光谱表现出两个特征：径向呼吸模式（RBM）和 G 带。这些拉曼特征呈现的 SWNTs 的丰富信息使得拉曼光谱成为一种通用且常见的工具，用于表征 SWNTs 的结构和性质及其变化。当受到外力作用时，SWNTs 的几何结构将发生变化，这进一步影响 SWNTs 的电子结构和声子特性。在本文中，重点介绍了在不同应变下，包括单轴应变、扭转应变、径向变形和弯曲变形，拉曼频率和共振拉曼强度如何演变。结果发现，取决于不同的结构变化，SWNTs 的拉曼光谱对每种应变的响应不同，表明共振拉曼光谱是一种合适的工具，可用于表征和研究 SWNTs 中的应变。
