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MoS2 QDs co-catalytic Fenton reaction for highly sensitive photoluminescence sensing of H2O2 and glucose

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Abstract

Photoluminescence probes based on a conventional Fenton system show unsatisfactory sensitivity due to low H2O2 decomposition efficiency. Herein, we report that molybdenum disulfide quantum dots (MoS2 QDs) show excellent co-catalytic activity for Fenton reactions due to the Mo4+ active sites on their surfaces facilitating Fe(III)/Fe(II) cycle reactions and high H2O2 decomposition efficiency. The MoS2 QDs were prepared by a simple hydrothermal method, and the obtained MoS2 QDs showed blue fluorescence with a high quantum yield of 13.4%, storage stability, and excellent water-solubility. By using bifunctional MoS2 QDs acting as both the fluorescent probe and the Fenton catalyst, a MoS2 QDs co-catalytic Fenton sensor system was proposed for ultrasensitive and selective fluorescence sensing of H2O2 with a linear range from 0.01 to 20 μM and a detection limit of 5 nM (S/N = 3). When coupled with glucose oxidase, glucose can be detected in the range of 0.01–30 μM with a detection limit of 7 nM. Moreover, we successfully demonstrated the potential application of the proposed system for glucose sensing in actual biological samples. The novel strategy proposed in this work may open a new window of interest in an unconventional application of MoS2 QDs-Fenton sensor platform for environmental and biological applications.

Graphical abstract: MoS2 QDs co-catalytic Fenton reaction for highly sensitive photoluminescence sensing of H2O2 and glucose

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Publication details

The article was received on 25 Nov 2018, accepted on 19 Dec 2018 and first published on 20 Dec 2018


Article type: Paper
DOI: 10.1039/C8AY02565G
Citation: Anal. Methods, 2019, Advance Article
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    MoS2 QDs co-catalytic Fenton reaction for highly sensitive photoluminescence sensing of H2O2 and glucose

    T. Wang, X. Hu, X. Zhang, H. Cao, Y. Huang and P. Feng, Anal. Methods, 2019, Advance Article , DOI: 10.1039/C8AY02565G

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