Growth of Highly Single Crystalline IrO2 Nanowires and Their Electrochemical Applications

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• 作者：Yumin Lee ; Minkyung Kang ; Jun Ho Shim ; Nam-Suk Lee ; Jeong Min Baik ; Youngmi Lee ; Chongmok Lee ; Myung Hwa Kim
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 30, 2012
• 年：2012
• 卷：116
• 期：34
• 页码：18550-18556
• 全文大小：451K
• 年卷期：v.116,no.34(August 30, 2012)
• ISSN：1932-7455

文摘

We present the facile growth of highly single crystalline iridium dioxide (IrO₂) nanowires on SiO₂/Si and Au substrates via a simple vapor phase transport process under atmospheric pressure without any catalyst. Particularly, high-density needle-like IrO₂ nanowires were readily obtained on a single Au microwire, suggesting that the melted surface layer of Au might effectively enhance the nucleation of gaseous IrO₃ precursors at the growth temperature. In addition, all the electrochemical observations of the directly grown IrO₂ nanowires on a single Au microwire support favorable electron-transfer kinetics of [Fe(CN₆)]^{4鈥?3鈥?/sup> as well as Ru(NH₃)₆3+/2+ at the highly oriented crystalline IrO₂ nanowire surface. Furthermore, stable pH response is shown, revealing potential for use as a miniaturized pH sensor, confirmed by the calibration curve exhibiting super-Nernstian behavior with a slope of 71.6 mV pH鈥?.}