Cadmium telluride quantum dots and preparation method thereof

A technology of cadmium telluride quantum dots and cadmium salts, which is applied in the direction of binary selenium/telluride compounds, metal selenide/telluride, nanotechnology, etc., which can solve the problems of good fluorescence performance, difficult merger and preparation time of cadmium telluride quantum dots, etc. problem, to achieve the effect of high fluorescence quantum yield, easy control of reaction conditions, and increase of reaction temperature

Inactive Publication Date: 2016-06-15
厦门市京骏科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The present invention aims to provide a cadmium telluride quantum dot and its preparation method to solve the problems that the existing cadmium telluride quantum dots are difficult to prepare and have short preparation time and good fluorescence performance

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  • Cadmium telluride quantum dots and preparation method thereof
  • Cadmium telluride quantum dots and preparation method thereof

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preparation example Construction

[0028] The invention provides a preparation method of cadmium telluride quantum dots, comprising the following steps: A) mixing tellurium simple substance, borohydride and water under anaerobic conditions, and reacting to obtain a tellurium precursor solution; B) mixing mercapto Compound, soluble cadmium salt, water and alkaline medium are mixed, react to obtain cadmium precursor solution; C) under anaerobic environment and stirring condition, step A) the tellurium precursor solution obtained and step B) the cadmium precursor obtained The solutions are mixed and reacted to obtain a cadmium telluride precursor solution; D) adding the cadmium telluride precursor solution obtained in step C) into a reaction kettle for reaction to obtain cadmium telluride quantum dots.

[0029] In the present invention, the tellurium element is preferably tellurium powder, and the borohydride is one or more of sodium borohydride or potassium borohydride, preferably sodium borohydride. The above-me...

Embodiment 1

[0038] A) Measure 50.8mg of tellurium powder and 37.8mg of sodium borohydride, put them into a 25ml double-necked flask respectively, seal the bottle mouth with an inversion stopper, remove the air in the double-necked flask and fill it with nitrogen protection, inject 10ml of Ultrapure water was heated at 60°C for 20 minutes to obtain a sodium telluride hydride solution.

[0039]B) Measure 45.7mg of cadmium chloride into a flask, add 100mL of water to dissolve, add 17.5μL of thioglycolic acid with a concentration of 2.4mol / mL under stirring, and then add sodium hydroxide solution dropwise to adjust the pH to 9 to obtain a cadmium precursor solution.

[0040] C) Take 1 mL of sodium telluride hydride solution, inject it into 100 mL of cadmium precursor solution under the protection of vigorous stirring and nitrogen flow, and obtain the cadmium telluride precursor solution. Wherein, the molar ratio of Cd / Te / mercaptoacetic acid contained in the system is 1:0.2:1.2.

[0041] D) ...

Embodiment 2

[0045] A) Measure 50.8mg of tellurium powder and 37.8mg of sodium borohydride, put them into a 25ml two-necked flask respectively, seal the bottle mouth with an inversion stopper, remove the air in the two-necked flask and fill it with nitrogen protection, inject 10ml of Ultrapure water was heated at 70°C for 30 minutes to obtain a sodium telluride hydride solution.

[0046] B) Measure 45.7 mg of cadmium chloride and transfer it to a flask, add 100 mL of water to dissolve, add 16 μL of thioglycolic acid with a concentration of 2.4 mol / mL under stirring, and then add 1 M potassium hydroxide solution dropwise to adjust the pH to 8 to obtain a cadmium precursor solution.

[0047] C) Take 2.5 mL of sodium hydride telluride solution, inject it into 100 mL of cadmium precursor solution under the protection of vigorous stirring and nitrogen flow, and obtain the cadmium telluride precursor solution. Wherein, the molar ratio of Cd / Te / mercaptoacetic acid contained in the system is 1:0....

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Abstract

The invention relates to a preparation method of cadmium telluride quantum dots; the preparation method comprises the steps: selecting a tellurium elementary substance as a tellurium source, cadmium chloride as a cadmium source and water as a solvent, and preparing a tellurium precursor solution under a condition of anaerobic heating; and after mixing of the tellurium and cadmium precursor solutions, carrying out a hydrothermal reaction in a reaction kettle to prepare the cadmium telluride quantum dots. The selected raw materials and solvent are wide in sources, low in cost and friendly to the environment; the reaction conditions are mild and are easy to control, and the reaction time can be greatly shortened; the obtained cadmium telluride quantum dots have the advantages of good water solubility and high fluorescent quantum yield; the method is simple, convenient and fast, also can be used for large-scale preparation, and provides a new economical and fast approach for synthesis of the high-quality cadmium telluride quantum dots.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a cadmium telluride quantum dot and a preparation method thereof. Background technique [0002] Due to their excellent optical properties, II-VI semiconductor nanocrystals (ie, quantum dots) have great application value in bioluminescent analysis and light-emitting devices such as lighting, display, and photovoltaic components. The emission spectrum of cadmium telluride quantum dots can cover the entire visible light region and the near-infrared region with the change of size, and can achieve a high quantum yield after surface modification. It is currently being intensively studied as a quantum dot. Cadmium telluride quantum dots are used in many fields due to their unique optical and electronic properties, such as biosensing, bioimaging, and light-emitting devices. However, the current research on the synthesis technology of cadmium telluride quantum dots cannot m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82Y30/00
CPCC01B19/007C01P2002/80C01P2004/04C01P2004/64
Inventor 陈建彬王翔黄明鹭
Owner 厦门市京骏科技有限公司
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