Facilitation of NADH electro-oxidation at treated carbon nanotubes.
Facilitation of NADH electro-oxidation at treated carbon nanotubes.
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DOI：
10.1021/ac902301b
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发表时间：
2010-02-15
影响因子：
7.4
通讯作者：
Gorski, Waldemar
中科院分区：
文献类型：
--
作者：
Wooten, Marilyn;Gorski, Waldemar
以酶辅因子二氢烟酰胺腺嘌呤二核苷酸（NADH）为氧化还原探针，研究了碳纳米管（CNT）表面状态与其电化学活性之间的关系。CNT在水中的沸腾，而非破坏性的，激活他们对NADH的氧化所示的在阳极峰电位的NADH（ENADH）从0.4到0.0 V的偏移。在ENADH的偏移是由于氧化还原介导的NADH氧化的痕量醌类，形成在处理的CNT的表面上。包括在浓硝酸中微波处理CNT的更苛刻的处理对ENADH具有类似的效果，并且另外，它增加了NADH的阳极峰电流。后者与酸-微波CNT表面上的缺陷的形成相关，如由它们的拉曼光谱所示。考虑到表面介体在酸微波处理的碳纳米管的弯曲石墨烯片上的作用，讨论了电流的增加。其他碳同素异形体，包括边缘平面热解石墨，石墨粉，和玻璃碳没有显示出对NADH的氧化相当的激活。
The relationship between the state of the surface of carbon nanotubes (CNT) and their electrochemical activity was investigated using the enzyme cofactor dihydronicotinamide adenine dinucleotide (NADH) as a redox probe. The boiling of CNT in water, while nondestructive, activated them toward the oxidation of NADH as indicated by a shift in the anodic peak potential of NADH (ENADH) from 0.4 to 0.0 V. The shift in ENADH was due to the redox mediation of NADH oxidation by traces of quinone species that were formed on the surface of treated CNT. The harsher treatment that comprised of microwaving of CNT in concentrated nitric acid had a similar effect on the ENADH and, additionally, it increased the anodic peak current of NADH. The latter correlated with the formation of defects on the surface of acid-microwaved CNT as indicated by their Raman spectra. The increase in current was discussed considering a role of surface mediators on the buckled graphene sheets of acid-microwaved CNT. The other carbon allotropes including the edge plane pyrolytic graphite, graphite powder, and glassy carbon did not display a comparable activation toward the oxidation of NADH.
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