关键词: 双层类脂膜, 循环伏安, 电化学阻抗谱, 直流偏压

Abstract: The effects of direct current(DC) bias voltage on the structure of lipid membranes forming on a glassy carbon electrode(GCE) was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).The experiment showed that the lipid membranes can be formed with either positive or negative bias potential exerted.When bias voltage was exerted,bilayer lipid membranes tended to form due to the electrostatic interaction between the superficial positive charges on the polarized electrode and the negative charged part of PC.When the positive bias voltage overrun the range,the lacunas on s-BLMs would increase,and the BLMs would be broken.A proper equivalent circuit was nonlinearly fitted,based on the data obtained from the electrochemical process.The result showed that the values of Ret and Cm represented the nicer state of mutual compensation.

Key words: bilayer lipid membrane, cyclic voltammetry, electrochemical impedance spectroscopy, direct current bias voltage