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Preparation method of hexagonal copper selenide nanosheets

A technology of nanosheets and copper selenide, which is applied in the field of preparation of nanomaterials technology, can solve the problems of uncontrollable CuSe reaction process, complex reaction process of CuSe nanosheets, uneven particle size distribution of CuSe nanoparticles, etc., and shorten the reaction time , reduce the chance of recombination, and have strong operability

Active Publication Date: 2014-09-03
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the reaction process of preparing CuSe cannot be controlled, resulting in uneven particle size distribution and various shapes of the prepared CuSe nanoparticles, as well as the complex reaction process of CuSe nanosheets and long reaction time. A preparation method with simple process, low cost, low energy consumption and capable of controlling the morphology of CuSe nanomaterials

Method used

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  • Preparation method of hexagonal copper selenide nanosheets
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  • Preparation method of hexagonal copper selenide nanosheets

Examples

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Embodiment 1

[0020] This embodiment relates to a preparation method of hexagonal copper selenide nanosheets, the specific steps are as follows:

[0021] (1) Add 3 mmol of cuprous chloride and 100 mg of polyvinylpyrrolidone to 50 mL of sodium hydroxide aqueous solution (5 mol / L), stir evenly with magnetic force, and record it as solution A;

[0022] (2) Add 4.5mmol selenium powder to the above solution A under continuous stirring conditions and continue stirring for 30min to obtain solution B;

[0023] (3) Pour solution B into a hydrothermal reaction kettle and place it in an oven, react at 140°C for 2 hours, take out the product after the reaction is completed and clean it with deionized water, and finally obtain hexagonal copper selenide nanosheets, The side length is 600 nm and the thickness is 20 nm.

[0024] Experimental process such as figure 1 As shown, the SEM image and absorption spectrum of the prepared product are as figure 2 and image 3 shown.

Embodiment 2

[0026] This embodiment relates to a preparation method of hexagonal copper selenide nanosheets, the specific steps are as follows:

[0027] (1) Add 4 mmol of cuprous iodide and 150 mg of polyvinylpyrrolidone to 50 mL of sodium hydroxide aqueous solution (12 mol / L), stir evenly with magnetic force, and record it as solution A;

[0028] (2) Add 6 mmol of selenium powder to the above solution A under continuous stirring conditions and continue stirring for 30 minutes to obtain solution B;

[0029] (3) Pour solution B into a hydrothermal reaction kettle and place it in an oven, react at 160°C for 1 hour, take out the product after the reaction is completed and clean it with deionized water, and finally obtain hexagonal copper selenide nanosheets, The side length is 610 nm and the thickness is 20 nm. The SEM image of the prepared product is shown in Figure 4 shown.

Embodiment 3

[0031] This embodiment relates to a preparation method of hexagonal copper selenide nanosheets, the specific steps are as follows:

[0032] (1) Add 5 mmol of cuprous chloride and 100 mg of polyvinylpyrrolidone to 50 mL of potassium hydroxide aqueous solution (10 mol / L), stir evenly with magnetic force, and record it as solution A;

[0033] (2) Add 7.5mmol selenium powder to the above solution A under continuous stirring condition and continue stirring for 30min to obtain solution B;

[0034] (3) Pour solution B into a hydrothermal reaction kettle and place it in an oven, react at 100°C for 4 hours, take out the product after the reaction is completed and clean it with deionized water, and finally obtain hexagonal copper selenide nanosheets, The side length is 500 nm and the thickness is 20 nm. The SEM image of the prepared product is shown in Figure 5 shown.

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Abstract

The invention discloses a preparation method of hexagonal copper selenide nanosheets. The preparation method comprises the steps of uniformly mixing copper salt and polyvinylpyrrolidone with a strong alkali water solution to form a solution A; adding selenium powder into the solution A under the magnetic stirring condition, and continuously stirring for 30 minutes to obtain a solution B; performing hydrothermal reaction on the solution B in a hydrothermal reaction kettle at 100-160 DEG C for 1-4 hours; taking out products and cleaning to obtain the hexagonal copper selenide nanosheets. According to the preparation method, copper selenide crystal nucleuses preferentially grow along a crystal surface under the induction effect of polyvinylpyrrolidone molecules by adopting a hydrothermal reaction process and polyvinylpyrrolidone as a surfactant, so that controllable preparation of the hexagonal copper selenide nanosheets is realized. The preparation method has the advantages that the process is simple, the reaction time is short, the operability is good, and a large quantity of hexagonal copper selenide nanosheets can be prepared. The transmission path of photogenerated electrons in the hexagonal copper selenide nanosheets is long, so that the compound probability of photogenerated carriers can be reduced.

Description

technical field [0001] The invention relates to a preparation method in the technical field of nanomaterials, in particular to a method for preparing hexagonal copper selenide nanosheets. Background technique [0002] Copper selenide (CuSe) is a well-known p-type semiconductor material with excellent photoelectric and catalytic properties, and has broad application prospects in photovoltaic cells, photodetectors and photocatalysis. It often has a variety of phases and structures, such as α-Cu that conforms to the stoichiometric ratio 2 Se, Cu 3 Se 2 , CuSe, CuSe 2 and non-stoichiometric Cu 2-x Se. Therefore, how to prepare copper selenide in pure phase is the premise of its large application in the above fields. In recent years, researchers have studied Cu 2 A lot of research has been done on the controllable preparation of Se nanomaterials, and the Cu 2 Se or Cu 2-x Controllable preparation of Se. However, there are few studies on the preparation of pure Cu(Ⅱ)Se n...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82Y30/00B82Y40/00
Inventor 李子炯运高谦常同钦王海燕袁朝圣
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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