Iridium oxide based coaxial pH ultramicroelectrode
Iridium oxide based coaxial pH ultramicroelectrode
复制标题
氧化铱基同轴 pH 超微电极
DOI：
10.1016/j.elecom.2013.12.012
复制
发表时间：
2014-03-01
影响因子：
5.4
通讯作者：
Zhan, Dong-ping
中科院分区：
文献类型：
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作者：
Huang, Xiao-rong;Ren, Qiong-qiong;Zhan, Dong-ping
在这种通信中，研制了一种由IrOx制成的工作电极和Ag/AgCl参比电极组成的同轴pH微电极。在尖端直径为5 pm的玻璃毛细管外壁上溅射Au，然后在Au层上电沉积IrOx膜，毛细管内层为可作为参比电极的Ag/AgCl线。该电极在pH=2.0~12.0范围内具有良好的线性关系，灵敏度为58.73+/-0.41 mV/pH。在选择性试验中，Na+、K+等几种碱性阳离子对电极的性能没有影响。此外，该超微电极的响应时间随溶液pH的不同而变化，响应时间从0.5S到5 S不等。这种pH传感器的优异性能和超微尺寸使其在原位/活体pH测量中具有很好的应用前景。(C)2013爱思唯尔B.V.保留所有权利。
In this communication, a coaxial pH microelectrode consisting of a working electrode made of IrOx and a Ag/AgCl reference electrode has been developed. The outer wall of the glass capillary with a tip diameter of 5 pm was sputtered with Au and then IrOx film was electrodeposited on the Au layer, while the inside of the capillary was a Ag/AgCl wire which can serve as a reference electrode. This electrode presented a linear response in the pH range from 2.0 to 12.0 with a sensitivity of 58.73 +/- 0.41 mV/pH. In selectivity tests, several alkaline cations such as Na+ and K+ didn't interfere with the performance of the electrode. Furthermore, the ultramicroelectrode exhibited rapid response times ranging from 0.5 s to 5 s depending on the solution pH. The excellent performance and ultramicro-size of this pH sensor make it very promising for in situ/in vivo pH measurements. (C) 2013 Elsevier B.V. All rights reserved.