MPA包覆的银纳米粒子修饰电极制备和电化学表征

运用自组装和电化学组装法,将MPA包裹的银纳米粒子修饰到金电极表面,制备成银纳米粒子单层和多层膜修饰电极. 循环电压-电流和电化学阻抗谱测定结果表明:以MPA包覆的银纳米粒子修饰电极的氧化电位明显负移,显示出银纳米粒子具有更高的活性. 以0.5mmol/L的K3[Fe(CN)6]溶液为检测体系,电化学阻抗谱测试得出电极表面对探针分子的阻碍作用有所增加. 循环电压-电流结果表明:与单层膜修饰电极相比,多层膜修饰电极的峰电流显著增加.

Mercaptopropionic Acid(MPA) Capped Silver Nanoparticles Modified Electrode and It's Electrochemical Behaviour

A new kind of silver colloid capped by 3-mercaptopropionic acid was prepared,and silver nanoparticles monolayer and multilayer films were fabricated on pre-modified gold electrode via self-assembly/electrochemical-assembly methods.The performance of this nanoparticle film was studied by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).As shown by experimental results,the modified electrode Ag-MPA/4-ATP/Au was more active than the others,and the electrochemical impedance was increased.The CV current of multilayer modified electrode(3(Ag-MPA)/2PDDA/4-ATP/Au) was higher than the monolayer modified electrode Ag-MPA/4-ATP/Au in 0.5?mmol/L K_3[Fe(CN)_6] solution.The interfacial electron transfer is promoted.