Preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step

Abstract

The invention provides a preparation method for synthesizing CdSe / CdS core-shell structure quantum dots through one step. The preparation method comprises the following steps of: mixing cadmium precursor with oleic acid and octadecene, adding oleylamine and trioctylphousphine oxide (TOPO), and heating the solution in argon atmosphere; injecting trioctylphosphine compound precursor, adding Cd precursor composed of cadmium ethyl xanthate, and keeping the temperature, thereby obtaining CdS clad core-shell quantum dots. The prepared microparticles has the advantages of good crystallinity, even size distribution, controllable particle diameter and the like, and the obtained core-shell structure quantum dots are good in stability and high in fluorescence efficiency; the method has no pilot process so that the operation steps of synthesizing the core-shell structure quantum dots are simple and the cost is low, and a large batch of core-shell structure quantum dots can be synthesized at a time; as a result, group II-VI semiconductor nanomaterials are suitable for actual application, and even industrial batch production.

Description

technical field [0001] The invention relates to the preparation technology of metal oxide quantum dots, in particular to a preparation method of core-shell structure quantum dots. Background technique [0002] Quantum dot nanomaterials have properties such as quantum size effect, quantum interference effect, quantum tunneling effect, Coulomb blocking effect, and nonlinear optical effect, and have shown broad application prospects in solar cells, sensors, and biomedicine. In recent years, semiconductor quantum dots (such as CdSe, PbSe, etc.) have attracted the attention of researchers. For example, studies have shown that quantum dots of different sizes and materials have unique uses in the construction of optoelectronic devices and their performance adjustment. [0003] The optical and electrical properties of quantum dots can be adjusted by coating a layer of shell structure on the surface of quantum dots, while avoiding the oxidation of the surface of quantum dots and impr...

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Problems solved by technology

[0003] The optical and electrical properties of quantum dots can be adjusted by coating a layer of shell structure on the surface of quantum dots, while avoiding the oxidation of the surface of quantum dots and improving their chemical stability. Currently, the commonly used method for preparing quantum dots with core-shell structure is alternating ion Injection method and organometallic pyrolysis method, although these two methods can realize the epitaxial growth of shell materials on the surface of CdSe nuclear quantum dots, and regulate the optical properties and surface stability of quantum dots, but using organometallic precursors to coat For CdSe nuclear quantum dots, the raw materials used are highly toxic, flammable and explosive, and expensive, so the synthesis cost is very high, and it is difficult to realize the synthesis of large quantities of nanomaterials; quantum dots synthesized by alternating ion implantation have high fluorescence efficiency , the size distribution is uniform and the optical properties of quantum dots can be precisely adjusted, but this method is complicated to operate and takes a long time to react. Since the error of each layer injection has a great impact on the growth of the subsequent shell layer, the amount of injected precursor is very demanding. accurate

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