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聚苯胺/钴-氧化钴膜作传感元件的pH传感器的性能
Properties of pH Sensors Modified by PAN/Co-Co3O4 as Sensing Element
【摘要】 研究了在玻碳电极上修饰不同物质所制得的pH传感器,通过电位滴定的方法比较得出先修饰聚苯胺,再修饰钴-氧化钴膜的电极对pH有较好的响应,能代替玻璃电极应用在实际样品测定中。探究了最佳修饰条件为:先在0.1 mol/L苯胺的盐酸(1 mol/L)溶液中,电位范围为-0.2~1.0 V,以100 mV/s的扫描速率循环伏安扫描10圈修饰聚苯胺膜;接着在含2.0×10-4mol/L Co2+的磷酸盐缓冲溶液(PBS)(pH=7.5)中,电位范围为-1.2~1.2 V,以100 mV/s的扫描速率循环伏安扫描5圈修饰钴-氧化钴膜。得到的修饰电极响应斜率为-61.60 mV/pH,响应范围pH值为0.5~13。
【Abstract】 Different substances were researched to modify glassy carbon electrode to make pH sensors.By means of potential titration,it was found that the electrode first modified with polyaniline and then with cobalt-cobalt oxide could had a good pH response.And it could be applied to the titration of real samples in place of glass electrode.Moreover,the best polymerization conditions were cyclic voltammetry scan 10 cycles at a concentration of 0.1 mol/L polyaniline in hydrochloride solution(1 mol/L) under the potential between-0.2 V to 1.0 V and cyclic voltammetry scan 5 cycles at a concentration of 2.0×10-4 mol/L cobalt in PBS solution(pH=7.5) under the potential between-1.2 V to 1.2 V.This electrode could have a response slope of-61.60 mV/pH,and the pH response range was from 0.5 to 13.
- 【文献出处】 应用化学 ,Chinese Journal of Applied Chemistry , 编辑部邮箱 ,2009年05期
- 【分类号】TP212.2
- 【被引频次】4
- 【下载频次】311