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'Indirect modification' of glassy carbon with gold nanoparticles using nonconducting support materials

机译：使用非导电载体材料用金纳米颗粒对玻璃碳进行“间接改性”

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摘要

Electrochemical measurements using nonconducting support materials, such as paper and cotton gauze, for modifying glassy carbon (GC) with gold nanoparticles (AuNPs) are described. After a seed-mediated growth modification of AuNPs on Kimwipes, a AuNP-Kimwipes-modified GC electrode that was fabricated by simply fixing a piece of AuNP-modified Kimwipes on a GC electrode surface showed almost reversible cyclic voltammetric responses for the oxidation of Fe(CN)_6 ~(4-) in 0.1M phosphate buffer solution (pH7.0) even when the GC surface was not polished before fixing. The electrochemical impedance results also indicated the significant effect of the AuNP-modified Kimwipes on reducing the charge transfer resistance. Similar effects were observed for AuNP-modified cotton gauze, whose characteristics were the partial coverage of a GC surface, and, for the electrode in that a piece of untreated Kimwipes was bound between AuNP-modified Kimwipes and a GC electrode surface. On the basis of such partial or remote effects of AuNPs together with other electrochemical results, plausible mechanisms to promote the electron transfer reaction of Fe(CN)_6 ~(4-) by AuNPs are discussed. In addition, as a specific phenomenon in the present modified electrodes, the adsorption of Fe(CN)_6 ~(4-) with the presence of AuNPs is described.
机译：描述了使用非导电载体材料（例如纸和棉纱布）进行电化学测量，以用金纳米颗粒（AuNPs）修饰玻璃碳（GC）的方法。在Kimwipes上进行AuNPs的种子介导的生长修饰后，通过简单地将一块AuNP修饰的Kimwipes固定在GC电极表面上制成的AuNP-Kimwipes修饰的GC电极显示出几乎可逆的循环伏安法，用于氧化Fe（即使在固定前未对GC表面进行抛光的情况下，也可以在0.1M磷酸盐缓冲溶液（pH7.0）中加入CN）_6〜（4-）。电化学阻抗结果还表明，AuNP修饰的Kimwipes对降低电荷转移电阻具有显著作用。对于AuNP修饰的棉纱布，其特征是GC表面的部分覆盖，观察到了类似的效果;对于电极，在AuNP修饰的Kimwipes和GC电极表面之间结合了一块未处理的Kimwipes。基于AuNPs的这种局部或远程效应以及其他电化学结果，讨论了促进AuNPs促进Fe（CN）_6〜（4-）电子转移反应的合理机制。另外，作为本发明的修饰电极中的特定现象，描述了在存在AuNPs的情况下Fe（CN）6〜（4-）的吸附。

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