Method for preparing quantum dots by taking sublimed sulfur as sulfur source

Abstract

The invention provides a method for preparing quantum dots by using sublimed sulfur as a sulfur source, and belongs to the field of nano material preparation. The preparation method is characterized by comprising the following steps: (1) respectively adding 0.5-6 g of sodium hydroxide, 3mL of polyethylene glycol (PEG400) and 1-10g of sublimed sulfur into 50mL of deionized water, and carrying out water bath reaction at 40-80 DEG C for 3-50 hours to obtain a mixed solution; (2) changing the mixed solution obtained in the step (1) from a water bath reaction to an ice bath reaction, and under a stirring condition, adding 10-50 mL of hydrogen peroxide in parts by weight to prepare a sulfur quantum dot solution with blue fluorescence characteristics; and (3) adding an anti-solvent acetone to settle the water-soluble sulfur quantum dots, centrifuging the sulfur quantum dots settled from the aqueous solution at a centrifugal rotating speed of 9000 r / min for 5 min, and freeze-drying the obtained precipitate (at a drying temperature of -30 DEG C for 12-18 h) to finally obtain white sulfur quantum dot powder. The preparation process is green, safe and easy to prepare, fluorescence intensity is enhanced, dispersity is good, and efficiency is high.

Description

technical field [0001] The invention provides a method for preparing quantum dots by using sublimed sulfur as a sulfur source, and belongs to the field of nanometer material preparation. Background technique [0002] Energy, new materials, biotechnology and information technology together constitute the four pillars of a civilized society. Among them, materials are the material basis of information and energy. Since the beginning of the 21st century, human beings have gradually deepened their research on materials, among which nanomaterials have attracted widespread attention due to their special physical and chemical properties. [0003] Among nanomaterials, quantum dots have attracted much attention due to their special optical properties. Quantum dots are zero-dimensional nanomaterials with quantum effects, and their size is strictly limited. This limitation makes the size of the material smaller than the free path of electrons, resulting in local interaction, so its e...

AI Technical Summary

Problems solved by technology

However, the low quantum yield of sulfur quantum dots, complicated preparation, long reaction time and other limitations make it still have a lot of room for improvement.

[0005] In view of the low quantum yield, cumbersome preparation and long reaction time of the current preparation methods of sulfur quantum dots, it is of great application value to explore efficient methods and select high-quality elemental sulfur resources to synthesize sulfur quantum dots

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