由CO气相分解（HiPco法）制备的单壁碳纳米管的拉曼活性模式。

Raman-active modes of single-walled carbon nanotubes derived from the gas-phase decomposition of CO (HiPco process).

作者信息

Chen G, Sumanasekera G U, Pradhan B K, Gupta R, Eklund P C, Bronikowski M J, Smalley R E

机构信息

Department of Physics, Pennsylvania State University, University Park, Pennsylvania, USA.

出版信息

J Nanosci Nanotechnol. 2002 Dec;2(6):621-6. doi: 10.1166/153348802321105897.

DOI:10.1166/153348802321105897

PMID:12908425

Abstract

Here we report Raman scattering studies of ropes of Single-walled carbon nanotubes (SWNTs) grown by a high CO pressure process. Five samples from five different batches were studied as a function of excitation wavelength. Three of these samples exhibited Raman spectra similar to that found for SWNTs made by pulsed laser vaporization of arc-discharge methods. The other two samples were found by Raman scattering to contain a significant fraction of tubes with diameter < 1.0 nm. These samples exhibited unusual spectra that, however, can be well understood within the existing models for the electronic and phononic states in SWNTs. Spectra recorded with 1064 nm for the sample having a significant fraction of smaller diameter tubes shows strong modes present between 500 and 1200 cm-1. We suggest these modes arise due to the enhancement of Raman cross-section for small diameter tubes.

摘要

在此，我们报告了通过高CO压力工艺生长的单壁碳纳米管（SWNTs）绳索的拉曼散射研究。研究了来自五个不同批次的五个样品作为激发波长的函数。其中三个样品的拉曼光谱与通过脉冲激光蒸发电弧放电法制备的SWNTs的光谱相似。通过拉曼散射发现，另外两个样品含有相当一部分直径<1.0 nm的管子。这些样品表现出不寻常的光谱，然而，在现有的SWNTs电子和声子态模型中可以很好地理解这些光谱。对于具有相当一部分较小直径管子的样品，用1064 nm记录的光谱显示在500至1200 cm-1之间存在强模式。我们认为这些模式是由于小直径管子的拉曼截面增强而产生的。