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One‐Pot, Facile, and Versatile Synthesis of Monolayer MoS 2 /WS 2 Quantum Dots as Bioimaging Probes and Efficient Electrocatalysts for Hydrogen Evolution Reaction
Author(s) -
Xu Shengjie,
Li Dian,
Wu Peiyi
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201403863
Subject(s) - materials science , molybdenum disulfide , quantum dot , tungsten disulfide , monolayer , nanotechnology , overpotential , chemical engineering , electrochemistry , chemistry , electrode , engineering , metallurgy
In this work, uniform molybdenum disulfide (MoS 2 )/tungsten disulfide (WS 2 ) quantum dots are synthesized by the combination of sonication and solvothermal treatment of bulk MoS 2 /WS 2 at a mild temperature. The resulting products possess monolayer thickness with an average size about 3 nm. The highly exfoliated and defect‐rich structure renders these quantum dots plentiful active sites for the catalysis of hydrogen evolution reaction (HER). The MoS 2 quantum dots exhibit a small HER overpotential of ≈120 mV and long‐term durability. Moreover, the strong fluorescence, good cell permeability, and low cytotoxicity make them promising and biocompatible probes for in vitro imaging. In addition, this work may provide an alternative facile approach to synthesize the quantum dots of transition metal dichalcogenides or other layered materials on a large scale.