循环伏安法研究银表面自组装膜的致密性

在Ag电极表面制备了3-巯基丙基三甲氧基硅烷(MPS)自组装单分子膜,通过循环伏安曲线(CV)、接触角等方法对修饰电极的电化学性能、组装膜的致密性等进行了研究.结果表明:修饰后电极的CV曲线峰电流减小、还原峰位发生负移及峰电位差增大,说明MPS已经在Ag电极表面成膜,对电子传输具有明显的抑制作用.膜的致密性受组装液浓度及组装时间的影响,当MPS的浓度为0.1 mmol/L、组装时间为6 h时,抑制电化学反应的效果较好,组装膜成膜状况较为理想.对不同水解时间接触角的分析表明,水解时间不同,MPS尾基的水解自聚度不同,延长水解时间能提高组装膜的致密度.

CYCLIC VOLTAMMETRY STUDY OF SELF- ASSEMBLED LAYER ON SILVER

Self-assembled monolayer(SAM) of 3-mercaptopropyltrimethoxysilane(MPS) absorbed on the surface of silver was constructed and electrochemical characteristics and compact extent of the monolayer was studied by cyclic voltammetry(CV) and contact angle.The results indicated that SAM by MPS can be obtained and can inhibit electrons from transferring across the thin film according to the decrease of peak current,the negative-moving reductive peak potential and the increase of peak potential difference of CV on the modified electrode.MPS assembled concentration and assembled time can affect compact extent of the monolayer and the best efficacious MPS assembled concentration in ethanol was 0.1 mmol/L for 6 h.An analysis of contact angle of the monolayer showed that self-polymeric extent of the end-group in MPS can increase with the increase of hydrolysis time and the compact extent of the monolayer can be markedly improved by prolonging hydrolysis time.