“Indirect Modification” of Glassy Carbon with Gold Nanoparticles Using Nonconducting Support Materials
“Indirect Modification” of Glassy Carbon with Gold Nanoparticles Using Nonconducting Support Materials
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使用非导电支撑材料用金纳米颗粒“间接改性”玻碳
DOI：
10.1002/elan.201200557
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发表时间：
2013
期刊：
影响因子：
3
通讯作者：
Munetaka Oyama
中科院分区：
文献类型：
--
作者：
Daisuke Nakashima;Frank Marken;Munetaka Oyama
介绍了用金纳米颗粒(AuNPs)修饰玻碳(GC)的非导电载体材料(如纸和棉纱)的电化学测量。通过种子介导法将金纳米粒子修饰在−表面，制备了金纳米颗粒修饰的金纳米颗粒修饰电极，在0.1 M磷酸盐缓冲溶液(pH 7.0)中，即使在固定前不打磨的情况下，金纳米颗粒修饰的电极对铁(CN)DNA的氧化也表现出几乎可逆的循环伏安响应。电化学阻抗结果也表明，AuNP修饰的Kimwipe具有显著的降低电荷转移电阻的作用。对AuNP修饰的棉纱也观察到了类似的效果，其特征是部分覆盖了GC表面，以及电极，因为一块未经处理的Kimwipe被结合在AuNP修饰的Kimwipe和GC电极表面之间。在此基础上，结合其他电化学结果，讨论了AuNPs促进Fe(CN)−电子转移反应的可能机理。此外，作为目前修饰电极中的一种特殊现象，本文还描述了在金纳米粒子存在下对Fe(CN)−的吸附。
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)64−in 0.1 M phosphate buffer solution (pH 7.0) 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)64−by AuNPs are discussed. In addition, as a specific phenomenon in the present modified electrodes, the adsorption of Fe(CN)64−with the presence of AuNPs is described.