纳米金—碳纳米管复合物修饰电极的电化学制备及用于双酚A的检测  

Fabrication of Modified Electrode of Multiwalled Carbon Nanotubes-gold Nanocomposites Film by Electrochemical Method and Its Sensitive Determination of Bisphenol A

作　　者：涂新满[1] 冯莉[1] 赵英杰[1] 

机构地区：[1]南昌航空大学,江西南昌330063

出　　处：《南昌航空大学学报（自然科学版）》2012年第3期63-68,共6页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：国家自然科学基金(50908113)

摘　　要：将羧基化碳纳米管(CNT-COOH)分散在HAuCl4溶液中,采用电位阶跃方法将HAuCl4还原为金纳米粒子(GNPs),并将CNTs同步沉积到玻碳电极表面,制备了纳米金-碳纳米管复合物修饰电极(GNPs/CNTs/GCE);采用循环伏安法(CV)、电化学交流阻抗(EIS)及扫描电子显微镜(SEM)对修饰电极进行了表征;研究了双酚A(BPA)在修饰电极上的电化学行为。结果表明,所制备的复合物修饰电极对双酚A有明显的电催化效果,在pH 7.0的磷酸盐缓冲溶液中,双酚A在0.496V处有一个明显的氧化峰,能显著提高双酚A的氧化峰电流。优化了测定参数如底液的pH、修饰剂的用量、扫描速度、富集时间等。在最佳条件下,双酚A浓度在2.0×10-6mol·L-1～2.0×10-5mol·L-1之间,氧化峰电流与其浓度呈现很好的线性关系。A novel gold nanoparticles（GNPs）and carbon nanotubes（CNTs）hybrid nanocomposite modified glassy carbon electrode（GNPs/CNTs/GCE）was prepared by using potential step method in the solution containing the carboxylated CNTs and HAuCl4.The modified electrode was characterized by cyclic voltammetry（CV）,electrochemical impedance spectra（EIS）and scanning electron microscopy（SEM）.The electrochemical oxidation behavior of Bisphenol A（BPA）on the modified electrode was investigated.The results showed that the Au/CNTs/GCE has a strong electrocatalytic action on BPA in phosphate buffer solution（PBS）of pH 7.0 and that BPA exhibited a significant oxidation peak at 0.496 V.The experimental parameters,which influence the oxidation current of bisphenol A,such as the amount of MWNT and GNPs on the GCE surface,the pH of the supporting electrolyte,and scan rate,were optimized.Under the optimal conditions,a linear response of bisphenol A was obtained over the range from 2.0×10-6mol·L-1 to 2.0×10-5 mol·L-1.

关 键 词：纳米金-碳纳米管 修饰电极 双酚A(BPA) 电催化 

分 类 号：TB383[一般工业技术—材料科学与工程] O611[理学—无机化学]