电容滴定法测定自组装膜表面酸度  

Determination of the Interfacial Acidity of the Functional Alkanethiols Self-assembly Membrane by Capacitance Measurement

作　　者：聂蓓[1] 杨秀荣[1] 

机构地区：[1]中国科学院长春应用化学研究所电分析化学国家重点实验室国家电化学和光谱研究分析中心,长春130022

出　　处：《分析化学》2002年第5期627-631,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助课题 (No .2 9845 0 0 2 )

摘　　要：利用本实验室自制的电容实时测量装置对巯基丙酸自组装膜的表面酸度进行电容滴定研究。相对于先前的测量和滴定技术 ,本方法可同时对界面电容值和溶液的pH值进行实时测定。同时对影响电容测定和自组装膜表面pKa 值的各种因素进行了详细的讨论。滴定结果和文献报道相近 ,证明了测定方法和仪器的可行性和实用性。The acid base equilibrium of self assembly monolayer(SAM) of mercaptopropionic acid on gold electrode was studied by capacitance titration. The change of capacitance was due to protonation and deprotonation of the modified electrode surface. This method can be used to measure pH value in solution and capacitance of solid/liquid on SAMs surface synchronously. The shift of p K s was observed during the experiment as previous reports. The factors that affect the capacitance measurement were discussed in detail.

关 键 词：电容滴定法 测定 自组装膜 表面酸度 电化学电容 

分 类 号：O657.1[理学—分析化学]