Method for preparing nano-crystal with core-shell structure

A technology of core-shell structure and nanocrystals, which is applied in the field of synthesis of high-quality core-shell structure nanocrystals by a phosphorus-free method, can solve the problems of harsh reaction conditions, complicated preparation process, and high synthesis cost, and achieve simplified synthesis procedures, simple procedures, and convenient The effect of the operation
CN101260294AInactive Publication Date: 2008-09-10王小萍
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
王小萍
Publication Date
2008-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method for a core-shell structure nanocrystal, wherein a nanocrystal in the shape of a spot particle containing selenium compound is dissolved in a solvent added with an additive, then the oxygen contained in the solution is eliminated in an environment of inertia gas to obtain a solution 1, then sulfur and the precursor of 12th group of elements are respectively dissolved in solutions with the same solvent and mixed so as to obtain a solution 2, which is dripped into the solution 1, then the mixed solution is heated up to 120-280 DEG C to make the nanocrystal to grow, so as to obtain the core-shell structure nanocrystal with the nanocrystal containing the selenium compound as the core and with the sulfide as the shell; the additive is an organic amine or an organic acid, each of which contains the carbons not less than 10; and the solvent is a non-coordinate solvent with the boiling point no higher than 60 DEG C; and the molecular ratio between the sulfur and the 12th group of elements is 1:1-1.5. The invention is characterized in simplified procedures, easy operation, environment-friendly solvent, low cost which can be saved by more than 50percent, and great application value on both laboratorial and industrial synthesis.
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Description

(1) Technical field

[0001] The invention relates to a method for preparing nanocrystals with core-shell structure, in particular to a method for synthesizing high-quality nanocrystals with core-shell structure without phosphorus. (2) Background technology

[0002] Semiconductor nanoparticles are also called semiconductor quantum dots. Due to their relatively small size, ranging from a few to a dozen nanometers, they will produce many physical and chemical properties that bulk materials do not have, such as quantum size effects and dielectric confinement effects. , surface effects, etc., making it have broad application prospects in optoelectronic devices, solar cells, and laser biomarkers. Core-shell structure nanocrystals are composite structure nanocrystals formed by coating one or more than two other materials on the basis of a single nanocrystal. A nanocrystal with a semiconductor as the core, a nanocrystal with a semiconductor with a narrow bandgap as the shell and a s...

Claims

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