Vitali L, Burghard M, Schneider M A, Liu Lei, Wu S Y, Jayanthi C S, Kern K
Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Phys Rev Lett. 2004 Sep 24;93(13):136103. doi: 10.1103/PhysRevLett.93.136103. Epub 2004 Sep 21.
The vibrational properties of single-wall carbon nanotubes have been probed locally with atomic-scale resolution by inelastic electron tunneling spectroscopy with a low-temperature scanning tunneling microscope. The high spatial resolution has allowed the unraveling of changes in the local phonon spectrum related to topological defects. We demonstrated that the radial breathing mode is suppressed within tube segments of lengths below approximately 3 nm, and that in the cap region phonon modes characteristic of the fullerene hemisphere are emerging. Phonon spectromicroscopy should lead to a better understanding of the mechanisms that limit the transport of heat or electrical charge inside nanostructured carbon materials.
利用低温扫描隧道显微镜的非弹性电子隧穿光谱技术，已在原子尺度分辨率下对单壁碳纳米管的振动特性进行了局部探测。高空间分辨率使得与拓扑缺陷相关的局部声子谱变化得以揭示。我们证明，在长度小于约3纳米的管段内，径向呼吸模式受到抑制，并且在帽状区域出现了富勒烯半球特征的声子模式。声子光谱显微镜技术应有助于更好地理解限制纳米结构碳材料内部热或电荷传输的机制。
