基于石墨烯和普鲁士蓝-金纳米复合材料电流型H_2O_2传感器的制备

Amperometric H_2O_2 Sensor Based on Graphene and Prussian Blue-gold Nanocomposites

首先制备出壳聚糖．石墨烯-纳米金复合膜修饰金电极（CHIT—RGO—GNPs／GE），然后在CHIT—RGO—GNPs／GE上电沉积普鲁士蓝-金纳米复合材料（PB—Au），制备了一种H202传感器（PB—Au／CHIT—RGO—GNPs／GE）．利用电化学交流阻抗技术（EIS）和循环伏安法（CV）对PB—Au／CHIT—RGO-GNPs／GE的制备过程进行了表征，对测试条件进行了优化，对不同浓度的H2O2进行了检测．其检测灵敏度为9．03mA／mM，线性响应范围为5．0×10^-7～1．0×10^-2M，相关系数为0．9947，检测下限为2．7×10^-7．所制备的传感器响应迅速、灵敏度高、检测范围较宽，可用于微量H2O2的快速检测，在食品加工、环境监测、临床检验等领域具有较好应用前景．

An amperometrie H2O2 sensor based on graphene and prussian blue-gold nanoeomposites （PB-Au/ CHIT-RGO-GNPs/GE） has been presented. A gold electrode （GE） was firstly modified with chitosan- grapheme- gold nanocomposite film （CHIT-RGO-GNPs） ,then gold-prussian blue nanocomposite （PB-Au） was deposited onto the modified gold electrode by cyclic voltammetry. The modified process was characterized by electrochemical impedance spectroscopy （EIS） and the cyclic voltammetry. Under optimal conditions, the resulting sensor displayed a rapid response to H2O2 and the linear range of the sensor was from 5.0×10^-7 ～ 1. 0×10^-2 M （correlation coefficient r=0. 994 7 ） with a lower detection limit of 2.7 ×10^-7 M and a sensitivity of 9.03 mA/rnM. The amperometrie H2O2 sensor exhibited fast response speed and low cost.