期刊
NANOMATERIALS
卷 8, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/nano8120976
关键词
MoS2; g-C3N4; peroxidase-like; colorimetric detection; H2O2
类别
资金
- National Natural Science Foundation of China [51702328]
- Key Lab of Marine Bioactive Substance and Modern Analytical Technique, SOA [MBSMAT-2016-05]
- Natural Science Foundation of Shandong Province, China [ZR2017BD002]
- China Postdoctoral Science Foundation [2017M622179, 2018T110681]
- CAS Light of West China Program
- Open Fund of Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao) [LMEES201802]
- Open Foundation of Pilot National Laboratory for Marine Science and Technology (Qingdao) [QNLM2016ORP0410]
- Aoshan Scientific and Technological Innovation Project - Pilot National Laboratory for Marine Science and Technology (Qingdao) [2016ASKJ14]
- Taishan Scholar
- Ministry of Human Resources and Social Security of China
MoS2 quantum dots (QDs) functionalized g-C3N4 nanosheets (MoS2@CNNS) were prepared through a protonation-assisted ion exchange method, which were developed as a highly efficient biomimetic catalyst. Structural analysis revealed that uniformly-dispersed MoS2 QDs with controllable size and different loading amount grew in-situ on the surface of CNNS, forming close-contact MoS2@CNNS nanostructures and exhibiting distinct surface properties. Compared to MoS2 QDs and CNNS, the MoS2@CNNS nanocomposites exhibited a more than four times stronger peroxidase-like catalytic activity, which could catalyze the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2 to generate a blue oxide. Among the MoS2@CNNS nanocomposites, MoS2@CNNS(30) was verified to present the best intrinsic peroxidase-like performance, which could be attributed to the more negative potential and larger specific surface area. A simple, rapid and ultrasensitive system for colorimetric detection of H2O2 was thus successfully established based on MoS2@CNNS, displaying nice selectivity, reusability, and stability. The detection limit of H2O2 could reach as low as 0.02 mu M. Furthermore, the kinetic and active species trapping experiments indicated the peroxidase-like catalytic mechanism of MoS2@CNNS. This work develops a novel, rapid, and ultrasensitive approach for visual assay of H2O2, which has a potential application prospect on clinical diagnosis and biomedical analysis.
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