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Solvothermal synthesis of MoS2 based quantum dots (QDs) and the performanceevaluation of bare QDs for the detection of aqueous As (III) oxidative state atroom temperature and neutral pH over an extremely wide range (0.1 ppb to 1000ppb) is reported here. Concentration-dependent photoluminescence (PL) of theQDs was found to be enhanced up to 50 ppb and then suppressed till 1000 ppb,showing two distinctive slopes for enhancement and suppression. Passivation oftrap states or defects of QDs may be the possible reason for enhancement, andthe formation of extremely small glassy As2S3 particles on the QD surface maybe the possible reason for suppression. The pattern of optical absorption ofQDs is featureless but shows an enhanced absorbance in the near UV range below300 nm, which increases with As (III) concentration up to 50 ppb and thendecreases following the PL pattern. The MoS2 QDs were characterized bytransmission electron microscopy (TEM), Xray diffraction (XRD), UV-Vis, and PLspectroscopy. The enhancement and suppression results can be fitted excellentlywith the modified Stern-Volmer equation, and the detection of arsenic ispossible using these linear fit equations as calibration curves.

Unique photoluminescence response of MoS2 quantum dots over wide range of As (III) in aqueous media