A novel hydrogen peroxide(H2O2)biosensor was prepared.First,zirconium dioxide(ZrO2)were solubilized in the aqueous solution of a biopolymer chitosan(CS)and the mutlicarbon nanotubes(MWNTs)was introduced into the ZrO2-CS solution to get a ZrO2-CS-MWNTs composite.Then the ZrO2-CS-MWNTs composite was immobilized onto the surface of the glass carbon electrode(GCE).Subquently,a stable nano-Au film was electrodeposited on the ZrO2-CS-MWNTs modified electrode at a constant potential.Finally,horseradish peroxidase(HRP)was immobilized onto the nano-Au layer to obtain the HRP/nano-Au/ ZrO2-CS-MWNTs /GCE electrode.The results showed that the biosensor exhibited well reduction ability for hydrogen peroxide with high sensitivity and fastresponse time resulting from.The biosensor displayed a rapid response to H2O2 and the linear range of the biosensor was from 7.80×10-6 to 9.26×10-3 mol/L with the detection limit of 2.8×10-6 mol/L(S/N=3).In addition,the biosensor showed fast response,high sensitivity,good stability and reproducibility.

本文以多壁碳纳米管(MWCNTs)和KMnO4为原料,通过直接氧化还原反应合成了一种新型MnO2-C纳米复合材料,将其滴涂在玻碳(GC)电极表面,成功制备出一种非酶型H2O2传感器。采用循环伏安法和计时电流法研究了该传感器对H2O2的电催化氧化行为。实验结果表明,与GC电极和MWCNTs修饰电极相比,该电极对H2O2氧化显示出更好的催化活性。实验对影响电极性能的各种参数,包括pH值、工作电位及MnO2-C修饰量进行了探讨。在最佳实验条件下,传感器对H2O2响应的线性范围为5.0×10-7～0.2mol·L-1,检测限(S/N=3)为1.4×10-7 mol·L-1。该传感器选材新颖,制备方法简单,重现性好,稳定性和抗干扰能力强。