Method for synthesizing near-infrared light argentic sulfide nanocrystalline coated by ligand

Abstract

The invention provides a synthesis method used for silver sulfide nanocrystals of adjustable ligand-covered near infrared luminescence, comprising the steps as follows: silver source and organic coating agent are added into toluene, heated and dissolved, subsequently added into water solution of sulfur source, reacted for 10min-24h at the temperature of 25-180DEG C; the reaction is carried out under normal pressure or high-pressure kettle; the silver source and the sulfur source are reacted at two-phase interface, the forming and growing of the silver sulfide nanometer particle crystal nucleus are carried out; finally, silver sulfide nanometer crystal with narrow distribution of the near infrared luminescence is formed. The synthesis method has the advantages of mild reaction time, short preparation period, easily controlling the consistency of raw material, being simple and feasible, thus being beneficial for amplification preparation of the large scale processing and production; the prepared silver sulfide nanometer particle can be dispersed into non-polarity organic solvent. The silver sulfide nanometer crystals with adjustable near infrared luminescence and different sizes can be synthesized by adjusting the reaction time, reaction temperature, the quantity ratio and dosage of the reaction matters, and the types of the organic covering agent.

Description

technical field [0001] The invention relates to a method for synthesizing ligand-coated near-infrared luminescent silver sulfide nanocrystals. Background technique [0002] As a group I-VI semiconductor, silver sulfide not only has good semiconductor material properties, but also has visible light absorption, main infrared transmission, photoluminescence, large third-order nonlinear polarizability and fast third-order nonlinear response speed, etc. Optical properties are favored in new photocontrol devices, photocatalysis, photoelectric devices and other fields. Especially when its size is close to or smaller than the exciton Bohr radius, the resonance strength of electrons and surface phonons in nanoparticles, the intra-band migration of electrons, inter-band transitions, and thermal motion of electrons and other photophysical and photochemical properties are similar to those of bulk materials. different. Silver sulfide is a direct narrow bandgap semiconductor with good c...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the traditional single-phase synthesis, which is difficult to control the reaction and the synthesized nanocrystals are prone to agglomeration, the present invention provides a method for preparing silver sulfide nanocrystals in a two-phase system