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Zinc oxide nano-sheet cluster and preparation method thereof

A zinc oxide nanometer and sheet cluster technology is applied in the field of chemistry, which can solve the problems of increasing cost and energy consumption, and achieve the effects of small size dispersion, simple process and high yield.

Active Publication Date: 2016-02-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all need heating reaction at a certain temperature, and in order to limit the growth of nanosheets, specific compounds are used as complexing agents, which increase the cost and energy consumption in the actual production process

Method used

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  • Zinc oxide nano-sheet cluster and preparation method thereof
  • Zinc oxide nano-sheet cluster and preparation method thereof
  • Zinc oxide nano-sheet cluster and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a) Adding a certain amount of zinc acetate and sodium hydroxide to deionized water at 5°C respectively to form an aqueous solution of zinc acetate and an aqueous solution of sodium hydroxide with initial concentrations of 1 mol / L and 4 mol / L respectively;

[0025] b) Take 20mL of the above-mentioned aqueous solution of zinc acetate, slowly add it dropwise to 30mL of the above-mentioned aqueous solution of sodium hydroxide, stir until the mixed solution is completely clear, and obtain Zn(OH) with a molar concentration of 0.4mol / L 4 2- aqueous solution;

[0026] c) the above Zn(OH) 4 2- Quickly pour 50mL of the aqueous solution into 500mL of deionized water at room temperature (25°C), and stir for precipitation reaction for 30 minutes;

[0027] d) Suction filter the obtained suspension, wash the product twice with deionized water and once with ethanol, and dry to obtain a white powder, which is the zinc oxide nanosheet cluster provided by the present invention, with a ...

Embodiment 2

[0039] According to the steps of Example 1, only the deionized water at normal temperature (25° C.) in step c was replaced with deionized water at 50° C. to obtain the zinc oxide nanosheet clusters provided by the present invention with a yield of 85%.

[0040] The scanning electron microscope results and XRD results of the resulting zinc oxide nanosheet clusters are shown in image 3 and 4 .

[0041] It can be seen from the figure that after increasing the reaction temperature, the size of the zinc oxide nanosheet clusters does not change greatly, but the zinc oxide sheets on the nanometer scale become slender compared to Example 1, and the nanosheet clusters are denser, and the nanosheet clusters has a diameter of 6 μm and consists of nanosheets with a thickness of 100 nm.

[0042] XRD results showed that the obtained product was still pure nano zinc oxide.

[0043] According to the method of Example 1, the photoelectric conversion efficiency of the dye-sensitized solar c...

Embodiment 3

[0045] According to the steps of Example 1, only sodium hydroxide in step a) was replaced with potassium hydroxide to obtain the zinc oxide nanosheet clusters provided by the present invention with a yield of 83%.

[0046] The scanning electron microscopy results of the resulting zinc oxide nanosheet clusters are shown in Figure 5 .

[0047] It can be seen from the figure that the product obtained in this example is basically the same as that in Example 1, and the use of different alkaline precursors has little effect on the morphology and composition of the product.

[0048]According to the method of Example 1, the photoelectric conversion efficiency of the dye-sensitized solar cell prepared by using the nano-zinc oxide obtained in this example is 4%.

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Abstract

The invention discloses a zinc oxide nano-sheet cluster and a preparation method thereof. The preparation method comprises the following steps: a zinc salt water solution is subjected to a reaction with an alkali solution, such that a water solution of Zn(OH)4<2-> is obtained; (2) the Zn(OH)4<2-> water solution obtained in the step (1) is subjected to a precipitation reaction in deionized water; a precipitate is collected when the reaction is finished; and the precipitate is dried, such that the zinc oxide nano-sheet clusters are obtained. The zinc oxide nano-sheet cluster preparation method provided by the invention has the advantages of low cost and high yield. The method has a simple process, and does not need high-temperature heating and the addition of a complexing agent. The product has good morphology controllability. With the method, nano-sheet clusters with single morphology and low size dispersion degree can be prepared. The method is suitable for industrialized productions.

Description

technical field [0001] The invention belongs to the field of chemistry and relates to a nanometer material, in particular to a zinc oxide nanosheet cluster and a preparation method thereof. Background technique [0002] Zinc oxide is an important wide-bandgap semiconductor material. It has a bandgap width of 3.37eV and an exciton binding energy of 60meV at room temperature. It is also non-polluting and rich in resources, so it is widely used in sensors, photocatalysis, and photoelectric conversion. . Due to the size effect, nanoscale zinc oxide exhibits unique physical and chemical properties, and has a large specific surface area, making it easy to prepare thin films, so it has more important application value than bulk materials. With the help of different synthesis methods, people have prepared a wealth of ZnO micro-nanostructures, including nanorods, nanosheets, nanobelts, nanospindles, nanoflowers, etc. [0003] The micro-nano composite structure of nanosheet clusters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00B82Y40/00
Inventor 王立铎董豪鹏郭旭东
Owner TSINGHUA UNIV
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