Cu_2O-SiO_2纳米复合物直接催化过氧化氢的传感器研究

A novel directly catalyzing hydrogen peroxide sensor based on Cu_2O-SiO_2 nanocomposites

通过水溶液法制备一种Cu2O-SiO2纳米复合物,并将其修饰于电极表面,直接催化过氧化氢,成功制得了一种无酶的过氧化氢传感器。通过循环伏安和计时电流法考察了电极的电化学特性,发现Cu2O-SiO2对过氧化氢(H2O2)有较好的催化性能。实验结果表明,制备的传感器在H2O2浓度为3.5×10-7～7.5×10-3 mol/L范围内有良好的线性响应,检测下限为1.2×10-7mol/L(S/N=3)。此外,该传感器具有制备简单、成本低、响应快、稳定性好等特点。

A directly catalytic sensor of hydrogen peroxide without the presence of enzyme was developed by immobilizing novel Cu2O-SiO2 nanocomposites,synthesized via a solution-phase method,on the surface of electrode.The performance of this sensor was observed by cyclic voltammetry（CV）method and chronoamperometry.The results confirmed that this sensor was simple to prepare,low-cost,with good stability,with fast and well linear response in the range of 3.5 × 10-7~7.5 × 10-3 mol/L with the lowest detection limit of 1.2 × 10-7 mol/L（S/N=3）.