Growth of Highly Single Crystalline IrO2 Nanowires and Their Electrochemical Applications
Growth of Highly Single Crystalline IrO2 Nanowires and Their Electrochemical Applications
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DOI：
10.1021/jp306900m
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发表时间：
2012-08-30
影响因子：
3.7
通讯作者：
Kim, Myung Hwa
中科院分区：
文献类型：
--
作者：
Lee, Yumin;Kang, Minkyung;Kim, Myung Hwa
我们提出了一个简单的气相传输过程中，在大气压下，没有任何催化剂的高度单晶二氧化铱（IrO 2）纳米线的SiO2/Si和Au衬底上的简易生长。特别是，高密度的针状IrO 2纳米线很容易得到一个单一的Au微丝，这表明熔化的表面层的Au可能会有效地提高成核的气态IrO 3前体在生长温度。此外，在单个Au微丝上直接生长的IrO 2纳米线的所有电化学观察支持[Fe（CN 6）]（4-/3-）以及Ru（NH 3）（6）（3+/2+）在高度取向的结晶IrO 2纳米线表面的有利的电子转移动力学。此外，显示出稳定的pH响应，揭示了用作小型化pH传感器的潜力，通过显示出斜率为71.6 mV pH（-1）的超能斯特行为的校准曲线证实。
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-/3-) as well as Ru(NH3)(6)(3+/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(-1).