Cu/g-C_(3)N_(4)修饰玻碳电极的制备及其电化学行为研究

Preparation and research on electrochemical behavior of Cu/g-C_(3)N_(4)modified glassy carbon electrode

热解三聚氰胺制备石墨相氮化碳(g-C_(3)N_(4)),并进行XRD、SEM表征。将处理好的g-C_(3)N_(4)滴涂到裸电极表面,然后再电沉积铜,制得Cu/g-C_(3)N_(4)修饰玻碳电极(GCE)。实验发现该电极对多巴胺(DA)具有良好的电催化氧化作用。当DA的浓度介于4.8×10^(-7)~1.0×10^(-5)mol/L时,与氧化峰电流呈良好的线性关系,其线性方程为Ipa(μA)=-7.416-0.272c(μmol/L),相关系数为0.9944;检测下限低至1.1×10^(-8)mol/L。考察了干扰物质对DA测定的影响,结果表明:该传感器选择性良好,同时也具有良好的稳定性和重现性。

Graphitic carbon nitride(g-C_(3)N_(4))is prepared by pyrolysis of melamine.The structure is characterized by XRD and SEM.The treated g-C_(3)N_(4)droplets are coated onto the surface of the bare electrode.Cu/g-C_(3)N_(4)modified glassy carbon electrode(GCE)is prepared by electrodepositing Cu on g-C_(3)N_(4)coated electrode.It is found that Cu/g-C_(3)N_(4)modified glassy carbon electrode has a strong electrocatalytic oxidation effect on dopamine(DA).At the concentration ranges of DA is 4.8×10^(-7)~1.0×10^(-5) mol/L,the fabricated sensor shows a good linear relationship with the oxidation peak current.The linear equation illustrated as Ipa(uA)=-7.416-0.272c(μmol/L)and the correlation coefficient is 0.9944.The detection limit is down to 1.1×10^(-8) mol/L.The influence of interfering substances on DA determination is investigated.Results show that the sensor has great selectivity,good stability and reproducibility.