Method for fast preparing particle size-controllable water-soluble silver selenide quantum dot

Abstract

The invention discloses a method for fast preparing a particle size-controllable water-soluble silver selenide quantum dot. The method comprises adding a stabilizer into a silver nitrate solution under heating in a water bath and magnetic stirring, carrying out stirring, adding a dispersant into the mixture, carrying out stirring, adjusting pH of the reaction solution to greater than 7, adding a sodium selenosulfate solution into the mixture, carrying out a reaction process for 5 to 8min, carrying out centrifugation precipitation on the product, removing the supernatant, and collecting the bottom precipitates so that the particle size-controllable water-soluble silver selenide quantum dot is obtained. The method utilizes cheap and nontoxic raw materials, has short reaction time of only 10-15min, is free of inert gas protection and post-treatment and has a simple purification process. The Ag2Se quantum dot does not contain toxic heavy metal elements, has good water solubility, controllable particle size and adjustable band gap, has excellent physicochemical properties and can be used for bio-labeling, biosensing, optoelectronics and optoelectronic devices.

Description

Technical field [0001] The invention belongs to the field of chemical materials science, and particularly relates to a method for quickly preparing water-soluble silver selenide quantum dots with controllable particle size. Background technique [0002] Quantum dots are 1-10nm quasi-zero-dimensional nanomaterials. Due to the quantum size effect, they have electronic and luminescence properties different from those of the bulk material, so they are widely used in biomarkers, light-emitting diodes, and solar cells. Among them, the size of quantum dots has an important impact on its performance. For example, the position of the emission spectrum can be adjusted by controlling the size. [0003] At present, the most widely used quantum dots of group II-VI and group IV-VI, such as CdS, CdSe, PdS, PdSe, etc., have the advantages of narrow fluorescence spectrum, high quantum yield, and strong oxidation resistance. But at the same time, the existence of toxic heavy metals lead or cadmium ...

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Problems solved by technology

[0005] Chinese Patent Publication No. CN 101555000 A discloses a method for preparing silver selenide nanomaterials, and successfully prepared silver selenide nanomaterials, but the method uses silver protein liquid as the silver source, and the preparation cost is relatively high and requires 12 ~ 96h static reaction, the reaction time is long, not conducive to mass production

[0006] It can be seen from the above that quantum dots have unique optical and electronic properties, but toxic metals, complicated preparation process, harsh reaction conditions, long reaction time and other factors limit the development of its preparation technology.

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