超薄碳糊电极的电化学性质及其应用

Electrochemical Behavior of Super-thin Carbon Paste Electrode and Its Analytical Application

在镍铬合金基体表面,构建了嵌入式纳米超薄碳糊电极（INCPE）,扫描电镜表征了电极形貌,以维生素B6为目标物,用循环伏安、差示脉冲以及多阶半微分电化学方法研究其电化学性质. INCPE对VB6有灵敏的响应. 在pH=6.7的磷酸盐缓冲溶液中,VB6的氧化峰电流与其浓度在1.0×10^-7～2.0×10^-4 mol/L范围内呈良好的线性关系,检出限（N/S=3）为7.0×10^-8 mol/L,相关系数为0.995 2. 结果表明,INCPE稳定、灵敏.

A novel nano-thickness carbon paste film electrode （INCPE） was constructed by inlaying carbon paste onto the surface of a nickel-chromium substrate. The surface structure of the INCPE was characterized by scanning electron microscopy （SEM）, and the electrochemical behavior of the electrode was investigated by cyclic voltammetry, differential pulse vohammetry and multi-step semi-differential electrochemical method with vitamin Bs as the reactant. Vitamin B6 showed a very sensitive response at INCPE. In a phosphate buffer solution（ pH = 6. 7 ）, the oxidation peak current was proportional to the concentration of vitamin B6 in the range of 1.0 ×10^-7 - 2. 0 ×10^-4 mol/L with a correlation coefficient of 0. 995 2. The detection limit of vitamin B6 was 7.0 ×10^-8 mol/L（N/S =3）. These results confirm that INCPE is stable, sensitive, inexpensive, convenient, and could be used as a working electrode.