纳米银/半胱氨酸修饰金电极的制备及对苯二酚的测定  

Prepartion of Ag Nanoparticle/L-cysteine Modified Gold Electrode and Its Application

作　　者：王广凤[1] 李茂国[1] 阚显文[1] 高迎春[1] 方宾[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,芜湖241000

出　　处：《应用化学》2005年第2期168-171,共4页Chinese Journal of Applied Chemistry

基　　金：国家教育部重点科技基金(00117);安徽师范大学青年基金(143 120043);安徽省教育厅自然科学基金(2004kj171)资助项目

摘　　要：通过L- 半胱氨酸将纳米银修饰到金电极上,通过电化学阻抗谱图对该修饰电极进行表征,考察了纳 米银/L -半胱氨酸修饰金电极的电化学行为,发现它的峰电流和扫描速度呈线性关系,算出在修饰条件下的银 胶在电极表面覆盖率为(5.7±0.4)×10-10mol/cm2。实验发现,对苯二酚在该电极上有显著响应。在3.0× 10-3～2.0mmol/L浓度范围内,其氧化峰电流与浓度呈良好线性关系,线性回归方程为ip(μA)=-0.056+ 1.137c(μmol/L),相关系数λ=0.9981,检测限为0.172μmol/L(S/N=3)。A silver nanoparticle/L-cysteine modified gold electrode was prepared and its electrochemical behaviour was evaluated by means of electrochemical impedance spectrocscopy(EIS) and cyclic voltammetry(CV). The surface coverage of Ag on the modified electrode((5.7±0.4)×10 -10 mol/cm 2) was calculated based on the linear relationship between peak current and scan rate. The modified electrode accelerates the response of redox of hydroquinone stably. The oxidation peak current is linearly changed with the concentration of hydroquinone at the modified electrode in the concentration range of 3.0×10 -3 to 2.0 mmol/L. The linear regression equation is i_p(μA)=-0.056+1.137c(μmol/L), with correlation coefficient λ=0.998 1, detection limit=0.172 μmol/L, signal-to-noise ratio=3.

关 键 词：纳米银 L-半胱氨酸 自组装金电极 对苯二酚 

分 类 号：O657[理学—分析化学]