Journal
TALANTA
Volume 141, Issue -, Pages 47-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2015.03.055
Keywords
Peroxidase mimetics; Molybdenum disulfide; Surfactant; Colorimetric detection; Hydrogen peroxide; Glucose
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Funding
- National Natural Science Foundation of China [21175046]
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In this work, we find that the peroxidase-like activity of MoS2 nanoparticles (NPs) is dependent on the surface charge. Negatively charged sodium dodecyl sulfate modified MoS2 nanoparticles (SDS-MoS2 NPs) possess highly-efficient peroxidase-like activity. MoS2 NPs with intrinsic peroxidase-like activity were synthesized through a simple one-pot hydrothermal route. The peroxidase-like activities of different surfactants modified MoS2 NPs were discussed. Compared with bare MoS2 NPs and positively charged cetyltrimethyl ammonium bromide modified MoS2 NPs, SDS-MoS2 NPs have the best peroxidase-like activity. SDS-MoS2 NPs can efficiently catalyze the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2 to generate a blue product. On basis of this, we have successfully established a novel platform for colorimetric detection of H2O2, and the detection limit is 0.32 mu M. Furthermore, the SDS-MoS2 NPs based platform can also be used for high sensitivity and selectivity detection of glucose with a wide linear range of 5.0-500 mu M by controlling the generation of H2O2 in the presence of glucose oxidase. (C) 2015 Elsevier B.V. All rights reserved.
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