基于多壁碳纳米管/二茂铁接枝壳聚糖的核/壳结构组合物多层膜电极的组装及其电催化

以聚二烯丙基二甲基氯化铵(PDDA)修饰的玻碳电极(GCE)为基础电极, 利用静电层-层自组装的方法将多壁碳纳米管/二茂铁接枝壳聚糖的核/壳结构组合物(MWCNTs@CHIT-Fc)和聚苯乙烯磺酸钠(PSS)在该电极表面进行交替多层组装. 用循环伏安(CV)、紫外-可见光谱(UV-Vis)和扫描电子显微镜(SEM)等方法对组装过程进行了跟踪表征. 用CV方法研究了抗坏血酸(AA)在该多层膜电极上的电催化氧化. 研究结果表明, 当MWCNTs@CHIT-Fc为6个双层时, AA在该修饰电极上的氧化峰电位与裸GCE相比降低了约0.4 V. 用控制电位电流法研究了不同MWCNTs@CHIT-Fc双层时AA的电流响应. 用该电极测定了AA的灵敏度, 检测限及线性范围等性能参数可通过控制组装的MWCNTs@CHIT-Fc双层数进行调节.

Fabrication and Electrocatalysis of Multilayer Film Electrodes Based on MWCNTs@CHIT-Fc Composites

Using the electrostatic self-assembly technique,the multilayer films containing multiwalled carbon nanotubes and ferrocene branched chitosan(MWCNTs@CHIT-Fc) and PSS were alternately fabricated on GCE modified with PDDA.The obtained thin films were characterized by CV,UV-Vis and SEM.The electrocatalytic oxidation of AA on the multilayer film electrode was studied in detail by CV.When the number of bilayers of MWCNTs@CHIT-Fc on the GCE is 6,the oxidation peak potential of AA was lowered by at least 0.4 V compared with that obtained at bare GCE.The current response of AA at different bilayers of MWCNTs@CHIT-Fc on the modified electrode was studied by amperometric method.The analytical performance of the modified electrode such as sensitivity,detection limit and linear range for AA determination can be turned to the desired level by adjusting the number of deposited MWCNTs@CHIT-Fc bilayers.