用电容平面图研究金/十八硫醇单分子膜的自组装过程和缺陷情况

STUDIES OF THE SELF ASSEMBLING PROCESS AND DEFECTS OF OCTADECANETHIOL MONOLAYER ON GOLD BY CAPACITANCE PLANE PLOT

推导了电化学体系中理想极化电极、电化学极化电极的复数电容表达式。根据这些表达式分析了上述体系的电容平面图 (Capacitance Plane Plot,CPP) ,利用 CPP可以方便地监测体系的电容值。用电子元件组成了上述体系的等效电路 ,测定了交流阻抗谱 ,得到了 CPP与理论推导一致。研究了金 /十八硫醇自组装膜的 CPP,根据 CPP讨论了金 /硫醇膜的组装过程及缺陷和组装时间的关系。

The expressions of complex capacitance for ideal polarized electrodes and kinetic ontrolled electrodes were deduced.The capacitance plane plot(CPP)of these electrodes was analyzed based on the expressions.By using CPP,the capacitance of working electrode can be conveniently monitored.The deduced expressions and CPPs of the above mentioned electrodes were confirmed by experimental results of equivalent circuits composed of electronic elements.According to the CPPs of Au supported octadecanethiol monolayer(Au/OTM),the assembling process was studied and the relationship between defects in Au/OTM and adsorption time was discussed.