Solution redox chemistry of carbon nanotubes
Solution redox chemistry of carbon nanotubes
复制标题
DOI：
10.1021/ja0457967
复制
发表时间：
2004-12-01
影响因子：
15
通讯作者：
Diner, BA
中科院分区：
文献类型：
--
作者：
Ming, Z;Diner, BA
紫外/可见/近红外吸收光谱用于监测小分子氧化还原试剂和碳纳米管 (CNT) 之间的电子转移。富集 (6, 5) 的纳米管在水中用 K(2)lr(Cl)(6) 氧化，显示出价电子密度为 0.2-0.4 e(-)/100 个碳原子，还原电位与 NHE 相比约为 800 mV。发现碳纳米管的还原电位随着带隙的增加而增加，并随着阴离子分散剂的引入而降低。鉴于这种新揭示的碳纳米管氧化还原化学，我们提出先前观察到的低pH值下碳纳米管吸收光谱的漂白很可能是纳米管被氧氧化的结果。这些结果证明了碳纳米管易于氧化和还原，提供了一种量化价电子数量的方法，并指出了碳纳米管在氧化还原反应催化中的可能应用。
UV/vis/NIR absorbance spectra were used to monitor electron transfer between small-molecule redox reagents and carbon nanotubes (CNTs). The oxidation of (6, 5)-enriched nanotubes in water with K(2)lr(Cl)(6) reveals a valence electron density of 0.2-0.4 e(-)/100 carbon atoms and a reduction potential of similar to800 mV versus NHE. The reduction potential of CNTs is found to increase with increasing band gap and to decrease with the introduction of an anionic dispersant. In light of this newly revealed redox chemistry of CNTs, we propose that the previously observed bleaching of the CNT absorbance spectrum at low pH is most likely a consequence of the oxidation of the nanotubes by oxygen. These results demonstrate facile oxidation and reduction of CNTs, provide a way to quantify the population of valence electrons, and point to possible applications of CNT in the catalysis of redox reactions.