Preparation and fluorescence properties of MoS2 quantum dots/TiO2 heterojunction
To improve the fluorescence performance of molybdenum disulfide(MoS2),MoS2 quantum dots/titanium dioxide(TiO2)hybrid heterojunctions were prepared by ball milling method,and the effect of different loading amounts of MoS2 quantum dots on its fluorescence performance was investigated.The structure and properties were characterized by X-ray diffraction,scanning electron microscopy,Raman spectroscopy,and fluorescence spectroscopy.The diffraction peaks of the milled sample can be ascribed to MoS2 and TiO2,and there are no diffraction peaks of other substances.The position of each diffraction peak does not shift,indicating that no solid solution has been generated.The edge structure of the milled particles disappears,and the particles with size of less than 10 nm were adsorbed on the surface of the large particles,indicating that there are some MoS2 quantum dots on the surface of the TiO2 particles,so as to form a mixed-dimensional heterojunction.After ball milling,MoS2 exhibits a weak fluorescence peak at 634 nm(1.95 eV).The intensity of the fluorescence peak increases and the fluorescence peak shows a red-shifted phenomenon with the increase of loading amount of MoS2 quantum dots in MoS2/TiO2 heterojunction.The fluorescence performance of the heterojunction is found to be optimal when the loading amount of MoS2 quantum dots is 30％.These results provide new ideas for the preparation of MoS2 quantum dots/TiO2 heterojunction and enhancement of its fluorescence properties in the future.
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