摘要
采用电化学氧化技术在玻碳电极(GCE)表面制备了稳定的赖氨酸单层膜。利用电化学活性探针Fe(CN)63-结合电化学循环伏安技术,研究了在溶液不同pH值及不同浓度、不同电荷的阳离子的条件下该单层膜对带负电荷活性探针的静电排斥作用。实验结果表明,随着pH值从1.5增大到9.7,赖氨酸单层膜的静电排斥能力不断下降,Ca2+或A l3+的加入也会减弱其静电排斥能力,并且其静电排斥能力随Ca2+加入浓度的增大而减小。表明通过用电化学氧化技术将赖氨酸键合到碳表面,改变碳的表面荷电状态使其对带负电荷物质具有静电排斥作用是可行的。
A stable Lysine monolayer was obtained on the surface of glassy carbon electrode （GCE） by means of electrochemical oxidation method. The electrostatic repulsion of the monolayer to Fe （CN） 6^3- redox probe was investigated via cyclic voltammetry at different pH values and different concentrations of cations with different charges, respectively. The result show that the electrostatic repulsion of Lysine monolayer decreases with the increase of pH value from 1.5 to 9.7, and also decreases with the addition of Ca^2 ＋ or Al^3＋ . Furthermore, the electrostatic repulsion decreases with the increase of the concentration of Ca^2＋. Thus, it is feasible to change the charged state of carbon surface by linking Lysine to carbon surface via electrochemical oxidation that then makes the carbon surfaces have the electrostatic repulsion to negatively charged matter.
出处
《应用化学》
CAS
CSCD
北大核心
2005年第9期950-953,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(29973026)
教育部优秀青年教师资助计划基金
北京市教委项目资助
关键词
表面改性
玻碳
赖氨酸单层膜
循环伏安
静电排斥作用
surface modification, glassy carbon, Lysine monolayer, cyclic voltammetry, electrostatic repulsion
