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-Co_3O_4 as Sensing Element

作　　者：金根娣[1] 杜诗[1] 胡效亚[1] 

机构地区：[1]扬州大学化学化工学院,扬州225002

出　　处：《应用化学》2009年第5期597-601,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(20375034;20675071)

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0．1mol／L苯胺的盐酸（1moL／L）溶液中，电位范围为-0．2—1．0V，以100mV／s的扫描速率循环伏安扫描lO圈修饰聚苯胺膜；接着在含2．0×10“mol／LCo“的磷酸盐缓冲溶液（PBS）（pH=7．5）中，电位范围为-1．2～1．2V，以100mV／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-61．60mV／pH，响应范围pH值为0．5～13。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 cobaltcobalt 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 vohammetry scan 10 cycles at a concentration of O. 1 mol/L polyaniline in hydrochloride solution （ 1 mol/L） under the potential between - O. 2 V to 1.0 V and cyclic vohammetry 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.

关 键 词：聚苯胺 钴-氧化钴膜 电位滴定 

分 类 号：O657.1[理学—分析化学]