Intrinsic peroxidase-like catalytic activity of nitrogen-doped graphene quantum dots and their application in the colorimetric detection of H2O2 and glucose |
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| Authors: | Liping Lin Xinhong Song Yiying Chen Mingcong Rong Tingting Zhao Yiru Wang Yaqi Jiang Xi Chen |
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| Institution: | 1. Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;2. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China;3. Xiamen Huaxia College, Xiamen 361024, China |
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| Abstract: | In this paper, the highly intrinsic peroxidase-like catalytic activity of nitrogen-doped graphene quantum dots (N-GQDs) is revealed. This activity was greatly dependent on pH, temperature and H2O2 concentration. The experimental results showed that the stable N-GQDs could be used for the detection of H2O2 and glucose over a wide range of pH and temperature, offering a simple, highly selective and sensitive approach for their colorimetric sensing. The linearity between the analyte concentration and absorption ranged from 20 to 1170 μM for H2O2 and 25 to 375 μM for glucose with a detection limit of 5.3 μM for H2O2 and 16 μM for glucose. This assay was also successfully applied to the detection of glucose concentrations in diluted serum and fruit juice samples. |
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| Keywords: | Nitrogen-doped graphene quantum dots Intrinsic peroxidase-like catalytic activity Colorimetric detection H2O2 and glucose sensing |
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