Meyer Jannik C, Paillet Matthieu, Michel Thierry, Moréac Alain, Neumann Anita, Duesberg Georg S, Roth Siegmar, Sauvajol Jean-Louis
Max Planck Institute for Solid State Research, Stuttgart, Germany.
Phys Rev Lett. 2005 Nov 18;95(21):217401. doi: 10.1103/PhysRevLett.95.217401. Epub 2005 Nov 14.
Using electron diffraction on freestanding single-walled carbon nanotubes, we have determined the structural indices (n,m) of tubes in the diameter range from 1.4 to 3 nm. On the same freestanding tubes, we have recorded Raman spectra of the tangential modes and the radial breathing mode. For the smaller diameters (1.4-1.7 nm), these measurements confirm previously established radial breathing mode frequency versus diameter relations and would be consistent with the theoretically predicted proportionality to the inverse diameter. However, for extending the relation to larger diameters, either a yet unexplained environmental constant has to be assumed, or the linear relation has to be abandoned.
通过对独立单壁碳纳米管进行电子衍射，我们确定了直径范围在1.4至3纳米的碳纳米管的结构指数（n，m）。在同样的独立碳纳米管上，我们记录了切向模式和径向呼吸模式的拉曼光谱。对于较小直径（1.4 - 1.7纳米）的碳纳米管，这些测量结果证实了先前确立的径向呼吸模式频率与直径的关系，并且与理论预测的与直径成反比的比例关系相符。然而，为了将该关系扩展到更大直径的碳纳米管，要么必须假定一个尚未得到解释的环境常数，要么就得放弃线性关系。
