Raman studies of solutions of single-wall carbon nanotube salts.
Raman studies of solutions of single-wall carbon nanotube salts.
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DOI：
10.1021/jp054713l
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
E. Anglaret;F. Dragin;A. Pénicaud;R. Martel
中科院分区：
文献类型：
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作者：
E. Anglaret;F. Dragin;A. Pénicaud;R. Martel
用拉曼光谱研究了钠掺杂单壁碳纳米管（SWNT）盐的聚电解质溶液。他们的拉曼签名首先比较未掺杂的单壁碳纳米管悬浮液和干碱掺杂的单壁碳纳米管粉末，结果表明，纳米管的解决方案组成的重掺杂（带电）单壁碳纳米管。然后使用掺杂的拉曼特征来原位监测纳米管盐溶液暴露于空气和受体分子（苯醌）时的氧化反应。结果表明，从受体分子到单壁碳纳米管的直接电荷转移反应，导致其逐渐的电荷中和和最终沉淀在溶液中。实验结果与简单的氧化还原滴定过程相一致。
Polyelectrolyte solutions of Na-doped single-wall carbon nanotube (SWNT) salts are studied by Raman spectroscopy. Their Raman signature is first compared to undoped SWNT suspensions and dry alkali-doped SWNT powders, and the results indicate that the nanotube solutions consist of heavily doped (charged) SWNT. Raman signature of doping is then used to monitor in situ the oxidation reaction of the nanotube salt solutions upon exposure to air and to an acceptor molecule (benzoquinone). The results indicate a direct charge-transfer reaction from the acceptor molecule to the SWNT, leading to their gradual charge neutralization and eventual precipitation in solution. The results are consistent with a simple redox titration process occurring at the thermodynamical equilibrium.