A Generalized Method for Evaluating the Metallic-to-Semiconducting Ratio of Separated Single-Walled Carbon Nanotubes by UV−vis−NIR Characterization

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• 作者：Liping Huang ; Hongliang Zhang ; Bin Wu ; Yunqi Liu ; Dacheng Wei ; Jianyi Chen ; Yunzhou Xue ; Gui Yu ; Hisashi Kajiura ; Yongming Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：July 22, 2010
• 年：2010
• 卷：114
• 期：28
• 页码：12095-12098
• 全文大小：108K
• 年卷期：v.114,no.28(July 22, 2010)
• ISSN：1932-7455

文摘

A general and useful method has been developed to evaluate the metallic-to-semiconducting (M/S) ratio for separated single-walled carbon nanotubes (SWNTs). By virtue of measuring UV−vis−NIR spectra of a variety of solutions with different ratios of metallic-rich to semiconducting-rich SWNTs, the commercial IsoNanotubes samples as well as metallic-rich HiPCO SWNTs (HiPCO-M) separated by an Agarose gel method have been evaluated. Values of 99.5% metallic contents for IsoNanotubes-M, 98.9% semiconducting contents for IsoNanotubes-S, and 1.24 for the absorption coefficient of IsoNanotubes, whereas 80.4% metallic contents for HiPCO-M and 1.05 for the absorption coefficient of HiPCO SWNTs were obtained. This method does not need pure metallic (M-) or semiconducting (S-) SWNTs as references. Furthermore, we found that this method can also be applied to evaluate the M/S ratio for any SWNT samples.