Sulfur quantum dot and preparation method and application thereof

The invention provides a sulfur quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: adding sulfur powder into a dispersion systemfor ultrasonic treatment to obtain dispersion liquid; wherein the dispersion system comprises polyethylene glycol and hydrogen peroxide; transferring the dispersion liquid into a reaction kettle forsolvothermal reaction; and after the reaction is finished, naturally cooling to room temperature and adjusting the pH value to be neutral to obtain the sulfur quantum dot. The sulfur quantum dot prepared by the method is high in yield, rich in surface functional groups, relatively small in size, relatively uniform in particle size distribution, good in water solubility, good in dispersity, good inbiocompatibility and excellent in fluorescence property, and can be widely applied to the fields of cell imaging, ion detection and the like. 本发明提供了一种硫量子点及其制备方法和应用。该制备方法包括：将硫粉添加于分散体系中进行超声处理，得到分散液；所述分散体系中包括聚乙二醇和过氧化氢；将分散液转移至反应釜中