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ZnO-CuO core-shell structure quantum dot/nanocrystal and preparation method thereof

A core-shell structure and quantum dot technology, which is applied in the field of preparation of nanomaterials, can solve the problems of difficult ZnO-CuO core-shell structure and many one-dimensional structures, and achieves the effects of low cost, uniform product and convenient operation.

Inactive Publication Date: 2015-06-24
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, due to the large structural difference between ZnO and CuO crystals, it is difficult to prepare the ZnO-CuO core-shell structure, and there are many rod-shaped or linear one-dimensional structures. For example, Ruey-Chi Wang et al. Obtain ZnO nanorods, and then use dip coating method to obtain ZnO-CuO rod-like core-shell structure; Ji Chan Park et al. obtained ZnO-CuO core-branch structure nanoparticles from ZnO nanospheres by two-step injection method

Method used

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  • ZnO-CuO core-shell structure quantum dot/nanocrystal and preparation method thereof
  • ZnO-CuO core-shell structure quantum dot/nanocrystal and preparation method thereof
  • ZnO-CuO core-shell structure quantum dot/nanocrystal and preparation method thereof

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Experimental program
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Embodiment 1

[0030] Embodiment one ( process such as Figure 7 shown ）：

[0031] 1) The ZnO core was prepared by sol-gel method: 0.176 g of zinc acetate dihydrate [Zn (CH 3 COO) 2 2H 2 O] and 10ml of absolute ethanol were stirred in a 60°C water bath until fully dissolved to obtain a 0.08mol / L ethanol solution of zinc acetate (solution A). Stir 0.96g of sodium hydroxide (NaOH, flake) and 96ml of absolute ethanol at room temperature until fully dissolved to obtain a 0.5mol / L ethanol solution of sodium hydroxide (solution B). The obtained solution A and solution B were all mixed together, and stirred at a constant speed of 600 r / min for 12 hours at room temperature to obtain a uniform ZnO quantum dot / nanocrystal sol (ZnO sol).

[0032] 2) Use the hydrolysis of copper salt to coat the CuO shell on the ZnO core: 0.040g of copper acetate monohydrate [Cu (CH 3 COO)·H 2 O] and 10ml of absolute ethanol were stirred at 60°C until fully dissolved to obtain a 0.08mol / L ethanol solution of co...

Embodiment 2

[0039] Embodiment two (comparative example):

[0040] The preparation process is basically the same as in Example 1, except that the pH value in the coating process is maintained in the range of 11~12 (note: the pH does not include the content end value of 11), and the coating reaction is still carried out. During the process, the amount of ethanol solution added with NaOH was controlled to adjust.

[0041] The obtained powder product is analyzed by X-ray diffraction, and the results are as follows: Figure 5 As shown, because the pH is too large to cause the overall erosion of the ZnO core, the Cu 2+ Infiltrate into the ZnO lattice to form a new Cu, O, Zn ternary compound, but cannot form a core-shell structure.

Embodiment 3

[0042] Embodiment three (comparative example):

[0043] The preparation process is basically the same as that of Example 1, except that the pH value in the coating process is maintained in the range of 9-10 (note: the pH does not include the end value of 10), and the coating reaction is still carried out. During the process, the amount of ethanol solution added with NaOH was controlled to adjust.

[0044] The obtained powder product is analyzed by X-ray diffraction, and the results are as follows: Figure 6 As shown, because the pH is too small to inhibit the hydrolysis of copper salt, it is not enough to provide the raw materials needed to form the shell, but there will still be a small amount of Cu 2+ Infiltrated into the ZnO lattice to form a new ternary compound.

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Abstract

The invention discloses a ZnO-CuO core-shell structure quantum dot / nanocrystal and a preparation method thereof. The material takes ZnO as a coated inner core and takes CuO as an outer shell coating ZnO. The preparation method of the core-shell structure comprises the following steps: firstly preparing the ZnO inner core by a sol-gel method and further coating a layer of CuO outer shell on the ZnO inner core by hydrolysis of a copper salt. The grown ZnO-CuO core-shell structure quantum dot / nanocrystal has good absorption in a visible light wave band and further has an absorption peak near blue-violet light and can be used in the photoelectric fields of solar cells, photocatalysis, ultraviolet functional materials and the like. The ZnO-CuO core-shell structure quantum dot / nanocrystal disclosed by the invention has the advantages of strong controllability and uniform and stable product; compared with the prior art, the operation process flow is greatly simplified, and the operation process is improved; and the cost is low, and the ZnO-CuO core-shell structure quantum dot / nanocrystal is suitable for mass production.

Description

technical field [0001] The invention relates to the preparation of a nano material, in particular to a ZnO-CuO core-shell structure quantum dot / nano crystal (ie ZnO-CuO core-shell composite material) and a preparation method thereof. Background technique [0002] Zinc oxide (ZnO) is a II-VI material with a band gap of 3.37eV at room temperature and belongs to the direct wide bandgap optoelectronic semiconductor. Another notable feature of ZnO is that the exciton binding energy is 60meV, which enables excitons to exist at room temperature or higher and has good environmental stability. At the same time, ZnO quantum dots also have the advantages of environmental friendliness, low production cost and abundant raw materials, non-toxic and easy to degrade, which make them widely used in light-emitting diodes (LEDs), detectors, solar cells, transparent conductors, sensors and photocatalysis. field. [0003] In recent years, ZnO-based composite materials not only inherit the supe...

Claims

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Application Information

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IPC IPC(8): C09K11/58C09K11/02
Inventor 李宏夏梦玲
Owner WUHAN UNIV OF TECH
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