Preparation method of zinc and silver co-doped cadmium sulfide quantum dots

A technology of co-doping, cadmium sulfide, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of thioglycolic acid, such as toxicity, general fluorescence performance, harsh reaction conditions, etc., and achieves excellent electrochemical and fluorescence performance and simple process. , the effect of short response time

Inactive Publication Date: 2016-08-10
NANJING COLLEGE OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation method of CdS quantum dots mainly adopts organic synthesis method, which has disadvantages such as harsh reaction conditions, expensive reagents, and toxic raw materials.
Using thioglycolic acid as a coating agent, quantum dots can be synthesized in the water phase. The disadvantage is that thioglycolic acid is toxic; the surface of quantum dots is modified with glutathione. Glutathione is non-toxic, and the disadvantage is that the fluorescence performance is general.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 50 mL of CdCl with a molar concentration of 0.05 mol / L 2 2.5H 2 O solution was placed in a three-necked flask, and 5 mL of Zn(CH 3 COO) 2 2H 2 O solution, 5 mL of AgNO with a molar concentration of 0.005 mol / L 3 Stir the solution evenly by magnetic force; pass high-purity nitrogen gas for half an hour, add 3 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L to the above solution dropwise, and stir evenly by magnetic force;

[0021] Under the protection of nitrogen, adjust the pH value of the solution to 10 with NaOH with a molar concentration of 0.05 mol / L, and continue to magnetically stir evenly; slowly add 13 mL of NaOH with a concentration of 0.2 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; put the solution in a water bath at 80° C., and the reaction time is 3 hours to obtain an aqueous solution of zinc and silver co-doped cadmium sulfide quantum dots. After the solution was cooled, an equal amount of absolute ethanol wa...

Embodiment 2

[0023] 30 mL of CdCl with a molar concentration of 0.06 mol / L 2 2.5H 2 O solution was placed in a three-necked flask, and 2 mL of Zn(CH 3 COO) 2 2H 2 O solution, 3 mL of AgNO with a molar concentration of 0.01 mol / L 3 Stir the solution evenly by magnetic force; pass high-purity nitrogen gas for half an hour, add 8 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L to the above solution dropwise, and stir evenly by magnetic force;

[0024] Under the protection of nitrogen, use NaOH with a molar concentration of 0.05 mol / L to adjust the pH value of the solution to 11.8, and continue to magnetically stir evenly; slowly add 25 mL of NaOH with a concentration of 0.08 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; put the solution in a 70°C water bath, and the reaction time is 5 hours to obtain an aqueous solution of zinc and silver co-doped cadmium sulfide quantum dots. After the solution was cooled, an equal amount of absolute ethanol was...

Embodiment 3

[0026] 50 mL of CdCl with a molar concentration of 0.06 mol / L 2 2.5H 2 O solution was placed in a three-necked flask, and 5 mL of Zn(CH 3 COO) 2 2H 2 O solution, 2 mL of AgNO with a molar concentration of 0.03 mol / L 3 Stir the solution evenly by magnetic force; pass high-purity nitrogen gas for half an hour, add 10 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L dropwise into the above solution, and stir evenly by magnetic force;

[0027] Under the protection of nitrogen, use NaOH with a molar concentration of 0.08 mol / L to adjust the pH value of the solution to 9, and continue to magnetically stir evenly; slowly add 25 mL of NaOH with a concentration of 0.1 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; place the solution in a water bath at 90° C., and react for 1 hour to obtain an aqueous solution of zinc and silver co-doped cadmium sulfide quantum dots. After the solution was cooled, an equal amount of absolute ethanol was added...

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Abstract

The invention relates to a preparation method of zinc and silver co-doped cadmium sulfide quantum dots. It is characterized in that: with Zn(CH 3 COO) 2 2H 2 O as zinc source, AgNO 3 The solution is silver source, with CdCl 2 2.5H 2 O is the source of cadmium, stir well to obtain a mixed solution, under the protection of nitrogen, use glutathione (GSH) as a stabilizer, in an alkaline aqueous solution, use Na 2 S·9H 2 O is a sulfur source, heated in a water bath, and reacted to obtain zinc and silver co-doped cadmium sulfide quantum dots. The preparation method has simple process, easy to obtain raw materials, low energy consumption, uniform particle size of quantum dots, excellent water solubility, excellent electrochemical performance and fluorescence performance, adjustable fluorescence emission peak position, and is suitable for use in fluorescent probes, photoelectric conversion, It has great application prospects in the detection of heavy metal ions.

Description

technical field [0001] The invention relates to the technical field of preparation of a novel fluorescent nano-semiconductor material, in particular to a preparation method of glutathione-modified zinc and silver co-doped cadmium sulfide quantum dots in an aqueous phase. Background technique [0002] Quantum Dots (Quantum Dots) is a new type of semiconductor nanomaterials, a new concept proposed in the 1990s. Semiconductor quantum dots are nanoparticles composed of II-VI or III-V groups. Due to the quantum size effect, quantum dots have the characteristics of high yield, stable luminescence, wide excitation spectrum, narrow emission spectrum, and tunable fluorescence. [0003] CdS quantum dots are an important semiconductor material with good electrochemical and optical properties, and have broad application prospects in the fields of biological detection, solar cells, and biomarkers. At present, the preparation method of CdS quantum dots mainly adopts organic synthesis met...

Claims

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Application Information

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IPC IPC(8): C09K11/56
Inventor 胡智学刘欣
Owner NANJING COLLEGE OF CHEM TECH
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