NMR Detection of Single-Walled Carbon Nanotubes in Solution

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• 作者：Alex Kitaygorodskiy ; Wei Wang ; Su-Yuan Xie ; Yi Lin ; K. A. Shiral Fernando ; Xin Wang ; Liangwei Qu ; Bailin Chen ; and Ya-Ping Sun
• 刊名：Journal of the American Chemical Society
• 出版年：2005
• 出版时间：May 25, 2005
• 年：2005
• 卷：127
• 期：20
• 页码：7517 - 7520
• 全文大小：206K
• 年卷期：v.127,no.20(May 25, 2005)
• ISSN：1520-5126

文摘

The detection of nanotube carbons in solution by ¹³C NMR is reported. The highly soluble samplewas from the functionalization of ¹³C-enriched single-walled carbon nanotubes (SWNTs) with diamine-terminated oligomeric poly(ethylene glycol) (PEG_1500N). The ferromagnetic impurities due to the residualmetal catalysts were removed from the sample via repeated magnetic separation. The nanotube carbonsignals are broad but partially resolved into two overlapping peaks, which are tentatively assigned tonanotube carbons on semiconducting (upfield) and metallic (downfield) SWNTs. The solid-state NMR signalsof the same sample are similarly resolved. Mechanistic and practical implications of the results are discussed.