Method for preparing selenium-containing compound nano crystal

Abstract

The invention relates to a preparation method of selenium-bearing compound nanocrystal, which comprises following steps: heating the precursor of the twelve family elements to 240 to 380 DEG C in inertia environment; mixing with the selenium precursor at 20 to 300 DEG C; enabling the growth of the mixture at 240 to 380 DEG C for 1 to 12 hours to obtain the selenium-bearing compound nanocrystal; wherein, the selenium precursor is obtained by dissolving selenium salt in the solvent with additives; the additives are organic amine or organic acid with the carbon content of no less than 10; the solvent is non-coordinating solvent with the dissolving point of no more than 60 DEG C; the molar ratio of the additives and the selenium is 3 to 5:1. The method has the advantages of regular and stable low toxicity medicine for synthesis, economy, environmental friendliness, capability of saving cost of over 80%, high quality of nanocrystal, even size distribution, high fluorescence efficiency, narrow FWHM (full width at half maximum), and huge application value in both laboratory synthesis and industrial synthesis.

Description

(1) Technical field [0001] The invention relates to a preparation method of a selenium-containing compound nanocrystal, in particular to a method for synthesizing a high-quality selenium-containing compound nanocrystal without phosphorus. (2) Background technology [0002] Semiconductor nanoparticles, especially II-VI semiconductor nanoparticles are research hotspots in recent years. Semiconductor nanoparticles are also called semiconductor quantum dots (Quantum Dots, referred to as QDs). 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 effect, dielectric confinement effect, surface effect, etc., which make it have broad application prospects in optoelectronic devices, solar cells, and laser biomarkers. Recently, research on semiconductor nanocrystals in the visible light-emitting region, especially as a biomarker, has attracted attentio...

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Problems solved by technology

However, Peng et al. and other groups have been using tributylphosphine (TBP) or trioctylphosphine (TOP) to dissolve selenium as the precursor of selenium when synthesizing the precursor of selenium. The disadvantage is that tributylphosphine or trioctylphosphine are toxic, flammable and explosive drugs, and they are expensive

In 2005, Zou Bingsuo's group discovered that dissolving selenium powder into liquid paraffin, and then injecting cadmium precursors at high temperatures can synthesize CdSe nanocrystals, but the quality of the synthesized nanocrystals is not as good as that of tributylphosphine or trioctylphosphine. Therefore, the low-cost and low-cost synthesis of high-quality selenium-containing compound nanocrystals without phosphorus is still blank.

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