聚多巴胺修饰的Ag/AgCl参比电极的制备及其性能试验  

Preparation and properties of Ag/AgCl reference electrode modified by polydopamine

作　　者：张西良[1] 苏小青 陈成[1] 徐云峰[1,2] ZHANG Xiliang;SU Xiaoqing;CHEN Cheng;XU Yunfeng(School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Lanshen Group Co.,Ltd.,Nanjing,Jiangsu 211500,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]蓝深集团股份有限公司,江苏南京211500

出　　处：《江苏大学学报（自然科学版）》2024年第4期490-496,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(32071900);江苏省博士后科研资助计划项目(2021K086A);江苏省研究生科研创新计划项目(KYCX17_1758)。

摘　　要：为了适应栽培基质等非均相体系pH值的在线检测,并提供稳定的参考电位,采用磁控溅射沉积银膜、NaClO溶液氯化获得的AgCl层和多巴胺沉积修饰膜,研制了聚多巴胺修饰的Ag/AgCl固体薄膜参比电极,并在沉积时间分别为4、8、12、16 h时,对聚多巴胺修饰的参比电极在磷酸缓冲盐溶液(phosphate buffered saline,PBS)中的稳定性、可逆性和循环伏安特性曲线进行了对比测试.结果表明:参比电极在PBS溶液中电位标准差均约为1.00 mV,在不同pH缓冲溶液中均能够恢复到相对稳定的电位,且偏差小于5.00 mV,具有良好的可逆性;在50次循环伏安试验中电位漂移很小;根据参比电极的氯离子灵敏度为2.00~2.50 mV/pCl,聚多巴胺修饰的参比电极对氯离子浓度不敏感,证实聚多巴胺修饰的参比电极可以用作参比电极;沉积时间为12 h时的参比电极在各项试验中综合性能表现最优,应用试验表明该参比电极更适用于开展栽培基质pH检测.To realize the on-line detection of pH value of heterogeneous systems and provide stable reference potential,the polydopamine modified Ag/AgCl solid film reference electrode was developed by magnetron sputtering deposition of silver film and chlorination of NaClO solution to obtain AgCl layer and dopamine deposition modification film.The stability,reversibility and cyclic voltammetry characteristics of polydopamine modified electrodes with deposition times of 4,8,12 and 16 h were compared in phosphate buffered saline(PBS)solution.The results show that the standard deviation of response potential of reference electrode in PBS solution is about 1.00 mV.It can recover to relatively stable potential in different pH buffer solutions,and the deviation of the reference electrode is less than 5.00 mV with good reversibility.The response potential drift is small in 50 cyclic voltammetry tests.According to the sensitivity of the reference electrode ranging from 2.00 to 2.50 mV/pCl,the polydopamine modified electrode is not sensitive to chloride ion concentration,which confirms that the polydopamine modified reference electrode is feasible.The reference electrode with deposition time of 12 h has the best comprehensive performance in various tests.The application tests illuminate that the reference electrode is more suitable for the detection of pH of cultivation substrate.

关 键 词：参比电极 聚合物膜 电化学行为 表面改性 沉积时间 

分 类 号：O657.1[理学—分析化学]