Abstract
Molybdenum oxide quantum dots (MoOx QDs) fluorescent detection is receiving increasing attention, but low quantum yield (QY) limits its sensitivity and resolution. MoO3 QDs with high remarkedly QY (up to 24.5%) were synthesized by a facile gradient oxidation method. The structure, morphology, and optical properties of MoO3 QDs were characterized by FTIR, XRD, AFM, TEM, and fluorescence spectroscopy, and its synthesis mechanism was elucidated from experimental observation. Finally, a fluorescence turn-off sensing platform was built, based on the MoO3 QDs, and high-sensitivity trace detection of Cr2O72− was realized for the first time. It was found that the Cr2O72− detection range was 0–0.15 μM, and the detection limit was up to 59 nM.
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