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A sensitive enzyme-free hydrogen peroxide sensor based on a chitosan–graphene quantum dot/silver nanocube nanocomposite modified electrode
[摘要] Graphene quantum dots (GQDs) and silver nanocubes (AgNCs) were synthesized successfully and characterized by UV-vis and fluorescence (FL) spectra, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The GQDs and AgNCs modified gold electrode (GE) possesses good conductivity shown by electrochemical impedance spectroscopy (EIS). The Chit–GQDs/AgNCs/GE displays a good electrocatalytic activity towards the reduction of hydrogen peroxide (H2O2), and can be used as a novel and sensitive enzyme-free H2O2 sensor. According to the amperometric experiments, the sensor exhibits a rapid response, a wide linear range from 10 μM to 7.38 mM, a low detection limit of 0.15 μM and high selectivity, as well as a good repeatability for H2O2 determination.
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[效力级别]  [学科分类] 分析化学
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