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Excellent peroxidase mimicking property of CuO/Pt nanocomposites and their application as an ascorbic acid sensor

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Abstract

Due to low cost and high stability, the applications of inorganic nanomaterials as efficient alternatives to natural enzymes are drawing much attention. In this work, novel CuO/Pt nanocomposites with high peroxidase-like activity were designed and applied for the colorimetric detection of ascorbic acid (AA). The nanocomposites were prepared by decorating Pt NPs on the surface of CuO nanosheets, which displayed good uniformity and showed improved distribution and stability. The catalytic activity of the prepared CuO/Pt nanocomposites was tested against various chromogenic substrates in the presence of H2O2, which displayed efficient peroxidase-like activity and high catalytic stability against temperature. The catalytic mechanism of the CuO/Pt nanocomposites was investigated by hydroxyl radical detection. The peroxidase-like activity decreased significantly in the presence of AA. On the basis of the inhibition property, a colorimetric biosensor was constructed by using the CuO/Pt nanocomposites for the detection of AA. It showed a high selectivity against amino acids, carbohydrates and normal ions. Thus, this work provides new insights into the application of inorganic nanocomposite-based nanozymes in the biosensing field.

Graphical abstract: Excellent peroxidase mimicking property of CuO/Pt nanocomposites and their application as an ascorbic acid sensor

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Publication details

The article was received on 08 Apr 2017, accepted on 24 May 2017 and first published on 24 May 2017


Article type: Paper
DOI: 10.1039/C7AN00589J
Citation: Analyst, 2017, Advance Article
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    Excellent peroxidase mimicking property of CuO/Pt nanocomposites and their application as an ascorbic acid sensor

    X. Wang, Q. Han, S. Cai, T. Wang, C. Qi, R. Yang and C. Wang, Analyst, 2017, Advance Article , DOI: 10.1039/C7AN00589J

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