Preparing process of CdS semiconduct quantum dot

Abstract

The present invention discloses precursor pyrolyzing process for preparing high dispersive liposoluble CdS semiconductor quantum dot. Precursor is first formed with long carbon chain containing dialkyl thiophosphinic acid as the ligand of metal Cd ion and then pyrolyzed in a simple pyrolysis process, and through further precipitating, filtering, drying, etc, nanometer CdS semiconductor powder is prepared. The produced nanometer CdS semiconductor powder has homogeneous particle size of about 5 nm and excellent optical property, and may be dissolved in benzene, toluene, petroleum ether and other nonpolar and weak polar solvent to form transparent nanometer disperse system.

Description

technical field [0001] The invention relates to a preparation method for obtaining highly monodisperse oil-soluble cadmium sulfide semiconductor quantum dots through a monomolecular precursor pyrolysis method. Background technique [0002] II-VI semiconductor compounds, because of their excellent physical properties, are widely used in the fields of light-emitting and display devices, laser and infrared detection, photosensitive sensors and photocatalysis, and have attracted widespread attention from material scientists. CdS is the most studied material among II-VI semiconductor compounds, and it is a direct bandgap semiconductor material with excellent optoelectronic properties. The agglomeration tendency of its nanoparticles is generally serious. [0003] The synthesis methods of semiconductor nanoparticles are divided into two categories: vapor phase growth method and wet chemical reaction method. As far as vapor phase growth technology is concerned, most quantum dots a...

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Problems solved by technology

However, the main disadvantages at present are that the introduction of sulfur sources and the modifiers participating in the reaction are mainly concentrated on expensive reagents such as TOPO (trialkyl oxide) / TOP (trialkyl oxide), and the application prospects are limited to a considerable extent.

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