PPy/ATP化学修饰电极的制备及其性能研究

Preparation of PPY/ATP Chemically Modified Electrode and Investigation on Its Stability

采用多步掺杂与脱掺杂的电化学方法制备掺杂ATP的PPy化学修饰电极(PPy/ATP),利用紫外-可见光谱(UV)、傅立叶红外光谱(FTIR)、循环伏安曲线(CV)等对ATP的掺杂进行表征,并对PPy/ATP化学修饰电极的CV曲线及交流阻抗曲线(EIS)进行测试发现,掺杂ATP后,PPy膜的电化学性能仍然较好。利用紫外-可见光谱(UV)对ATP掺杂稳定性进行测试,结果发现,随浸泡时间延长,在260nm指纹处的吸光度Abs变得越来越小,吸收峰几乎完全消失;但是将电极置于新的氯化钠溶液中电位恒定为负值时,仍然会有ATP脱掺杂出来,说明ATP的掺杂比较稳定,浸泡虽然会使部分脱掺杂,但仍有一部分较稳定地掺杂在PPy中。

Conducting PPy films were electrochemically deposited onto the gold electrode doped with biomolecules of ATP with doping and dedoping method. UV, FTIR and CV curves indicated that ATP was doped into conducting PPy film. CV curves and EIS curves suggested that the electrochemical properties of PPy/ATP chemically modified electrode were still quite good. Stability of PPy/ATP was tested by UV and it demonstrated that the absorbency at 260 nm, the doctylogram region, became weak gradually with soaking time and finally the absorption peak almost disappeared. However, when the above electrode was dipped into NaCl aqueous solution and the potential was set at minus, ATP would be released, indicating that the doping of ATP was quite stable. Part of ATP still existed in the PPy films after soaking for a long time.