HiPco单壁碳纳米管的Stokes/anti - Stokes拉曼光谱

E. Gregan, S. Keogh, T. Hedderman, B. McCarthy, Garrett F. Farrell, G. Chambers, H. Byrne
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引用次数: 5

摘要

利用1.92 eV、2.4 eV、2.5 eV和2.7 eV的激光能量对单壁HiPco碳纳米管粉末的拉曼光谱进行了分析,并对Stokes贡献和反Stokes贡献进行了比较。根据径向呼吸模式的光谱定位确定直径分布在0.8 - 1.2 nm之间。直径分布与近红外吸收光谱测定结果一致。在所有激发能下,G线轮廓(≈1580cm−1)表明半导体管占主导地位,尽管在2.4 eV处有一些来自金属管的贡献。在所有情况下,反Stokes线都是弱的,Stokes/反Stokes比至少是一个数量级,这表明在任何一种情况下都有最弱的共振增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stokes/anti‐Stokes Raman Spectroscopy of HiPco Single‐Wall Carbon Nanotubes
An analysis of the Raman spectra of single‐walled HiPco carbon nanotube powder using laser energies of 1.92 eV, 2.4 eV, 2.5 eV and 2.7 eV, including a comparison of the Stokes and anti‐Stokes contributions is presented. The diameter distribution was determined to be 0.8 – 1.2 nm from the spectral positioning of the Radial Breathing Modes. The diameter distribution is consistent with that determined by NIR absorption spectroscopy. At all excitation energies the profile of the G‐line (≈ 1580cm−1) indicates a predominance of semiconducting tubes although at 2.4 eV there is some indication of some contribution from metallic tubes. In all cases the anti Stokes line was weak and the Stokes/anti Stokes ratio was at least an order of magnitude indicating at most weak resonance enhancement in either.
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