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Article dans une revue Microchimica Acta Année : 2020

Synergy between nanozymes and natural enzymes on the hybrid MoS2 nanosheets/graphite microfiber for enhanced voltammetric determination of hydrogen peroxide

Résumé

A biosensor for hydrogen peroxide (H2O2) has been developed based on the use of MoS2 nanosheets and graphite that are assembled to form a microfiber hybrid structure. The MoS2 nanosheets are synthesized in situ on a graphite microfiber. The chemical composition and surface morphology of the microfiber hybrid structure has been characterized. The microfiber is shown to display peroxidase-mimicking activity. In the next step, horseradish peroxidase, methylene blue, and chitosan are co-immobilized on the microfiber electrode. The use of MoS2 nanosheets warrants high electrochemical activity of immobilized enzyme on the electrode surface. The modified microfiber electrode, best operated at a voltage of − 0.3 V (vs. Ag/AgCl), can be used to sense H2O2 with a linear response in the 0.1 to 90 μM concentration range and with a determination limit of 30 nM (at S/N = 3). The good response is attributed to the synergistic enhancement of the synthetic nanozymes (few-layered MoS2 nanosheets) and immobilized natural horseradish peroxidase (HRP). [Figure not available: see fulltext.] © 2020, Springer-Verlag GmbH Austria, part of Springer Nature.
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hal-03770915, version 1 (06-09-2022)

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Jian Zhang, Dong Han, Yanhui Wang, Longwei Wang, Xuanyu Chen, et al.. Synergy between nanozymes and natural enzymes on the hybrid MoS2 nanosheets/graphite microfiber for enhanced voltammetric determination of hydrogen peroxide. Microchimica Acta, 2020, 187 (6), ⟨10.1007/s00604-020-04299-3⟩. ⟨hal-03770915⟩
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