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Issue 4, 2019
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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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Supplementary files

Article information


Submitted
25 Nov 2018
Accepted
19 Dec 2018
First published
20 Dec 2018

Anal. Methods, 2019,11, 415-420
Article type
Paper

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, 11, 415
DOI: 10.1039/C8AY02565G

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