A facile one-step method to produce MoS2 quantum dots as promising bio-imaging materials

Abstract

A facile one-step, low cost and green method is developed to produce molybdenum disulfide quantum dots (MoS₂ QDs) by solvothermal treatment in the presence of NaOH. The high resolution transmission electron microscope observation indicated the high crystallinity and narrow particle size distribution of the as-prepared MoS₂ QDs. The as-prepared MoS₂ QDs exhibited bright blue luminescence under UV light irradiation. Excitation-dependent photoluminescence emission is observed in the aqueous dispersion of MoS₂ QDs. By being directly applied for bio-imaging of HeLa cells, MoS₂ QDs showed bright luminescence, low toxicity and excellent biocompatibility. Furthermore, this convenient method may provide a potential advance for large-scale production of other layered materials.