Intensity Ratio of Resonant Raman Modes for (n,m) Enriched Semiconducting Carbon Nanotubes

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• 作者：Yanmei Piao ; Jeffrey R. Simpson ; Jason K. Streit ; Geyou Ao ; Ming Zheng ; Jeffrey A. Fagan ; Angela R. Hight Walker
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：10
• 期：5
• 页码：5252-5259
• 全文大小：404K
• 年卷期：0
• ISSN：1936-086X

文摘

Relative intensities of resonant Raman spectral features, specifically the radial breathing mode (RBM) and G modes, of 11, chirality-enriched, single-wall carbon nanotube (SWCNT) species were established under second-order optical transition excitation. The results demonstrate an under-recognized complexity in the evaluation of Raman spectra for the assignment of (n,m) population distributions. Strong chiral angle and mod dependencies affect the intensity ratio of the RBM to G modes and can result in misleading interpretations. Furthermore, we report five additional (n,m) values for the chirality-dependent G⁺ and G^– Raman peak positions and intensity ratios; thereby extending the available data to cover more of the smaller diameter regime by including the (5,4) second-order, resonance Raman spectra. Together, the Raman spectral library is demonstrated to be sufficient for decoupling G peaks from multiple species via a spectral fitting process, and enables fundamental characterization even in mixed chiral population samples.