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A preparation method of copper-doped zinc sulfide quantum dots with tunable luminescence

A technology of quantum dots and zinc sulfide, which is applied in the field of preparing luminescent tunable copper-doped zinc sulfide quantum dots, can solve problems such as single emission wavelength, and achieve the effects of good water solubility, simple preparation process and low cost

Active Publication Date: 2021-02-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Encapsulation and recombination between different quantum dots is an effective method, but the lattice matching, composite structure design and synthesis between quantum dots lead to the successful preparation of only a few composite quantum dots
However, the effect of changing the concentration of dopant ions in the product by only increasing or decreasing the amount of dopant ions in the reactant is not obvious, and the obtained quantum dots often have a single emission wavelength or the emission wavelength is only in a small range. altered quantum dots

Method used

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  • A preparation method of copper-doped zinc sulfide quantum dots with tunable luminescence
  • A preparation method of copper-doped zinc sulfide quantum dots with tunable luminescence
  • A preparation method of copper-doped zinc sulfide quantum dots with tunable luminescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Disperse 0.878g of zinc acetate dihydrate, 0.01g of copper sulfate pentahydrate and 87μL of mercaptopropionic acid in 120mL of deionized water to form a solution, stir evenly, and adjust the pH value of the solution with a concentration of 1M sodium hydroxide solution at the same time is 9, and the precursor solution is obtained. The precursor solution is placed in a microwave reactor, the reaction temperature is set at 120° C., and the reaction is carried out for 5-120 minutes to obtain a Cu-doped ZnS quantum dot solution with adjustable luminescence.

Embodiment 2

[0019] Example 2: Disperse 1.6g of zinc acetate dihydrate, 0.02g of copper sulfate pentahydrate and 160 μL of mercaptoacetic acid in 200mL of deionized water to form a solution, stir evenly, and adjust the pH of the solution with a concentration of 2M potassium hydroxide solution at the same time. 9. Get the precursor solution. The precursor solution is placed in a microwave reactor, the reaction temperature is set at 140° C., and the reaction is carried out for 5-60 minutes to obtain a Cu-doped ZnS quantum dot solution with adjustable luminescence.

Embodiment 3

[0020] Example 3: Disperse 0.878g of zinc acetate dihydrate, 0.01g of copper sulfate pentahydrate and 87uL of mercaptopropionic acid in 200mL of deionized water to form a solution, stir evenly, and adjust the pH value of the solution with a concentration of 1M sodium hydroxide solution at the same time is 10, the precursor solution is obtained. Put the precursor solution in a microwave reactor, set the reaction temperature at 140°C, stop the experiment after the reaction is carried out for 5-120min, and obtain a Cu-doped ZnS quantum dot solution with adjustable luminescence.

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Abstract

The invention discloses a method for preparing luminescent adjustable copper-doped zinc sulfide quantum dots, which belongs to the technical field of synthesis of nanoscale solid luminescent materials. In this method, zinc acetate is used as zinc source, copper sulfate is used as copper source, mercaptopropionic acid or mercaptoacetic acid is used as stabilizer and sulfur source, and the three substances are evenly dispersed in deionized water, and the pH value is adjusted to be alkaline to obtain a precursor solution. The reactor assisted the heating reaction, and controlled different reaction times to prepare copper-doped zinc sulfide quantum dots with adjustable luminescence. The obtained quantum dots have uniform particle size, good water solubility, high fluorescence stability, and the quantum dot fluorescence emission peak is adjustable between 500-595nm, and can be widely used in the fields of fluorescence sensors, biological imaging, solar cells, and the construction of optical devices. Compared with the traditional synthesis method, the present invention uses a protective agent as a sulfur source, avoiding various disadvantages such as additional introduction of a sulfur source, cumbersome operation, and environmental problems. Through simple mixing of reaction raw materials and one-step microwave-assisted reaction, copper-doped zinc sulfide quantum dots with adjustable luminescence are simply and quickly prepared, and the fluorescence emission peak can be adjusted in a wide range of 500‑595 nm by controlling the reaction time.

Description

Technical field: [0001] The invention belongs to the technical field of synthesis of nanoscale solid luminescent materials, and in particular relates to a simple and rapid one-pot method for preparing copper-doped zinc sulfide quantum dots with adjustable luminescence. Background technique: [0002] Quantum dots, due to their unique nanostructure and tunable optical properties, have broad application prospects in biological imaging, biological / chemical sensors, fluorescent probe labeling, solar cells and optoelectronic devices. Compared with traditionally used cadmium-containing quantum dots such as CdSe, CdS, and CdTe, ion-doped ZnS quantum dots, such as Cu-doped ZnS quantum dots, are very promising due to their low toxicity and good photoluminescence properties. Fluorescent materials with potential applications. [0003] At present, there are many methods for preparing Cu-doped ZnS quantum dots, such as solid-phase method, organic synthesis method and liquid-phase method....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/56B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/584
Inventor 张奎何利芳
Owner ANHUI UNIVERSITY OF TECHNOLOGY