Intrinsic radial breathing oscillation in suspended single-walled carbon nanotubes
Intrinsic radial breathing oscillation in suspended single-walled carbon nanotubes
复制标题
悬浮单壁碳纳米管的固有径向呼吸振荡
DOI：
10.1103/physrevb.83.113404
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发表时间：
2011-03-22
影响因子：
3.7
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Liu, Kaihui;Wang, Wenlong;Wang, Feng
径向呼吸振荡（RBM）是碳纳米管中最具特征的振动模式。本文通过结合拉曼散射和电子衍射技术，研究了结构定义的单壁碳纳米管（SWNTs）的RBM振荡的内在行为。RBM频率和纳米管结构的独立确定使我们能够最终建立RBM频率和反向纳米管直径之间的完美线性关系，这一直被推测在原始的SWNTs中成立。了解SWNT RBM振荡的内在直径依赖性不仅对碳纳米管的可靠拉曼表征至关重要，而且还可以通过RBM振荡频移定量探测SWNT与环境的相互作用。
Radial breathing mode (RBM) oscillation is the most characteristic vibration mode in carbon nanotubes. Here we investigate the intrinsic behavior of RBM oscillations of structurally defined single-walled carbon nanotubes (SWNTs) by combining Raman-scattering and electron-diffraction techniques on the same suspended nanotubes. The independent determination of RBM frequencies and nanotube structures allows us to establish conclusively the perfect linear relation between RBM frequencies and inverse nanotube diameters, which has been long speculated to hold in pristine SWNTs. Understanding the intrinsic diameter dependence of SWNT RBM oscillation not only is crucial for reliable Raman characterization of carbon nanotubes, but also enables quantitative probing of SWNT-environment interactions through the RBM oscillation frequency shift.