一步法电沉积制备纳米金/碳纳米管修饰电极及对邻苯二酚电催化性能研究  

Fabrication of multiwalled carbon nanotubes-gold nanocomposites film by one-step electrodeposition and its sensitive determination of catechol

作　　者：冯莉[1] 涂新满[1] 赵英杰[1] 邹云云[1] 

机构地区：[1]南昌航空大学环境与化学工程学院,江西南昌330063

出　　处：《江西化工》2012年第1期97-101,共5页Jiangxi Chemical Industry

摘　　要：以羧基化碳纳米管(CNT-COOH)溶液作为支持电解质,采用多电位阶跃电沉积方法将CNTs和纳米金同步直接沉积到玻碳电极表面,制备了对邻苯二酚(CAT)具有很高的电催化氧化作用的纳米金-碳纳米管修饰电极(Au/CNTs/GCE),其催化效果强于单独的金纳米粒子或碳纳米管修饰电极。通过优化沉积时间、pH和扫速对修饰电极的影响,并考察了在最佳条件下CAT在Au/CNTs/GCE修饰电极上的电化学行为,发现CAT在该修饰电极上发生可逆的氧化还原反应,响应电流与浓度在4.0×10-6～8.0×10-5mol/L和1.0×10-4～1.0×10-3mol/L范围内呈线性关系,相关系数分别为0.9996和0.9985,检出限为4.5×10-7mol/L(S/N)。A facile,one-step synthesis of mutilwalled carbon nanotubes（MWCNTs）-gold nanoparticles（GNPs） hybrid nanocomposites onto glassy carbon electrode（GCE） surface using Multi-Potential Steps（MPS） was presented,which was fabricated for an amperometric sensor of detection of catechol.The results indicate that the hybrid nanomaterials exhibited remarkable synergistic effect on the electrocatalytic activity towards catechol versus unmodified GCE and MWCNTs/GCE.The experimental parameters,including the electrodeposit time of modified MWCNTs and GNPs,the pH of the supporting electrolyte,scan rate and accumulation time,were examined and optimized.Under the optimal conditions,the linear range was 4.0×10-6-1.0×10-3 mol/L with the correlation coefcient of 0.9996 and 0.9985 respectively,and the low detection limit was 0.45μM（S/N）.

关 键 词：多电位阶跃法 一步法 电沉积 纳米金 邻苯二酚 

分 类 号：X703[环境科学与工程—环境工程] O643.3[理学—物理化学]