Preparation method of CdHgTe alloy quantum dots

Abstract

The invention discloses a preparation method of CdHgTe alloy quantum dots. The method comprises the following steps: A, reducing tellurium powder through potassium borohydride to prepare a potassium hydrogen telluride solution, namely weighing potassium borohydride and the tellurium powder in a test tube with a soft plug respectively, and adding high-purity water; B, weighing CdCl2.2.5H2O crystals, and dissolving in the high-purity water to obtain a cadmium chloride solution; C, weighing HgCl2 crystals, and dissolving in the high-purity water to obtain a mercury chloride solution; D, adding transferred thiohydracrylic acid into a cadmium chloride and mercury chloride mixed solution, and adjusting the pH value by using a sodium hydroxide solution; E, removing dissolved oxygen, adding the potassium hydrogen telluride solution, continuously introducing nitrogen, and mixing; F, irradiating a raw solution by indoor light to obtain a solution of the CdHgTe alloy quantum dots at different wavebands; G, adding isopropanol for purifying, and freeze-drying to obtain solid powder of the CdHgTe alloy quantum dots. The process is simple and easy to control; raw materials are low in price and easily available; the synthesized CdHgTe alloy quantum dots are small in particle size and very good in biocompatibility and can be used for marking fixed cells.

Description

technical field [0001] The invention relates to the synthesis of fluorescent nanometer materials, more specifically to a method for preparing CdHgTe alloy quantum dots at room temperature in an aqueous phase. The synthesis conditions are mild, the quantum dots have small particle size and high stability, and can be used for labeling fixed cells. Background technique [0002] CdHgTe alloy quantum dots have become a research hotspot because of their mild synthesis conditions and high biocompatibility. The CdHgTe quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high. At present, CdHgTe quantum dots prepared by aqueous phase synthesis are rarely reported. Due to the special energy band gap and special nucleation mechanism of metallic mercury, high temperature will cause quantum dots to aggl...

AI Technical Summary

Problems solved by technology

The CdHgTe quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high.

At present, CdHgTe quantum dots prepared by the aqueous phase synthesis method are rarely reported. Due to the special energy band gap and special nucleation mechanism of metallic mercury, high temperature will cause quantum dots to agglomerate and form nanorods, which is not conducive to biomarking.