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Method for synthesizing cadmium selenide or zinc selenide quantum-dot by selenium dioxide

A technology of selenium dioxide and synthesis method, which is applied in the field of semiconductor nanomaterial preparation, can solve the problems of high cost of alkylphosphine process, high cost, and danger of environmental pollution, and achieve good crystallinity, low synthesis cost and environmental friendliness Effect

Inactive Publication Date: 2008-05-21
HEFEI UNIV OF TECH
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Problems solved by technology

[0005] In short, the current synthesis process of selenide quantum dots (including cadmium selenide / zinc) has disadvantages: ① The cost of the alkylphosphine process is high, and there is a risk of environmental pollution; ② The cost of the existing phosphine-free process is high

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  • Method for synthesizing cadmium selenide or zinc selenide quantum-dot by selenium dioxide
  • Method for synthesizing cadmium selenide or zinc selenide quantum-dot by selenium dioxide
  • Method for synthesizing cadmium selenide or zinc selenide quantum-dot by selenium dioxide

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Embodiment Construction

[0036] 1. SeO 2 Precursor preparation

[0037] Take 0.112g of selenium dioxide powder and add it to 4ml of ethylene glycol monobutyl ether (diethylene glycol monobutyl ether), and then add 1ml of dodecyl dimethylamine, heat to 100°C, 10min to become completely transparent Colorless solution. Set aside.

[0038] 2. Synthesis of CdSe quantum dots and ZnSe quantum dots

[0039] (1) Synthesis of cadmium selenide in oleamide medium

[0040] Preparation of cadmium solution and synthesis of quantum dots: Mix 1.000 g of cadmium oleate, 2 ml of oleic acid, 2 ml of dodecyldimethylamine and 8 ml of N, N-dimethyl oleamide, heat to 150 ° C, and vacuum dehydrate for 0.5 Hour. After dehydration, heat to 230°C, add SeO 2For the precursor solution, the temperature is lowered to about 200-220°C, and the temperature is kept at 210±5°C for 1min to 10min (the time is determined according to the size of the product required by the design), and the reaction is terminated. The reaction solutio...

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Abstract

A method for synthesizing cadmium selenide or zinc selenide quantum dots from selenium dioxide is to add the selenium dioxide precursor solution into the fatty acid cadmium or fatty acid zinc precursor solution under stirring, and react at 150-320° C. After the end, it is separated and purified with low carbon alcohol. The method completely does not use alkylphosphine and other environmentally harmful solvents and surfactants, and can obtain high-quality quantum dots with narrow size distribution.

Description

1. Technical field [0001] The invention relates to a method for preparing a semiconductor nanometer material, specifically a method for synthesizing cadmium selenide or zinc selenide quantum dots from selenium dioxide. 2. Background technology [0002] Quantum dots are semiconductor nanocrystals whose size is smaller than the Bohr diameter of the corresponding material. Quantum dots are a new class of functional materials with broad application prospects due to their physical and chemical properties related to size and shape. Due to their good photoelectric properties, selenide quantum dots can be used in photodiodes, solar cells, single-electron lasers, biolabels and other fields. The controllable synthesis of selenide quantum dots is the focus of extensive research in recent years, and the synthesis of cadmium selenide, zinc selenide and their alloys and doping compound quantum dots is the focus. The current liquid-phase chemical synthesis method of semiconductor nanomat...

Claims

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Application Information

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IPC IPC(8): C01B19/04
Inventor 张忠平蒋阳王春李国华
Owner HEFEI UNIV OF TECH
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