Observing Iridium Oxide (IrOx) Single Nanoparticle Collisions at Ultramicroelectrodes

被引：240

作者：

Kwon, Seong Jung ^{[1
]}

Fan, Fu-Ren F. ^{[1
]}

Bard, Allen J. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Chem & Biochem, Ctr Electrochem, Austin, TX 78712 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 38期

基金：

美国国家科学基金会;

关键词：

SCANNING ELECTROCHEMICAL MICROSCOPY; METAL NANOPARTICLES; GOLD NANOPARTICLES; WATER OXIDATION; AMPLIFICATION; ELECTRODES; EVENTS;

D O I：

10.1021/ja106054c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We describe the electrochemical detection of single iridium oxide nanoparticle (IrOx NP) collisions on a NaBH4-treated Pt ultramicroelectrode (UME). We observe single NP events through the enhanced current by electrocatalytic water oxidation, when IrOx contacts the electrode and transiently sticks to it. The overall current transient consists of repeated current spikes that return to the background level, superimposed on a current decay, rather than the staircase response seen where an NP sticks on the UME. Here each event produces a unique current spike (or "blip"). The frequency of the spikes was directly proportional to the particle concentration, and the peak current increased with the applied potential. The observed current is very sensitive to the material and surface state of the measuring electrode; a NaBH4-treated Pt UME was important in obtaining reproducible results.

引用

页码：13165 / 13167

页数：3

共 17 条

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