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Gold-zinc oxide hetero-junction nano-particle array and method for preparing same

A nanoparticle array and nanoparticle technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of weak absorption strength and reduced catalytic reaction efficiency, so as to promote application, high catalytic reaction efficiency, good stability effect

Active Publication Date: 2018-06-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the technical problems that the absorption peak of the existing zinc oxide nanoparticles is mainly concentrated in the ultraviolet region, and the absorption intensity is relatively weak, and the photogenerated electrons and holes are easy to recombine during the reaction, resulting in a significant reduction in the efficiency of the catalytic reaction, the invention provides a The gold-zinc oxide heterojunction nanoparticle array and its preparation method not only have strong absorption peaks in the ultraviolet and visible light regions, but also have high catalytic reaction efficiency, and the preparation process is simple, the reaction temperature is low, fast and efficient, and the cost is low. Environmental protection and pollution-free, suitable for large-scale industrial production

Method used

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  • Gold-zinc oxide hetero-junction nano-particle array and method for preparing same

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preparation example Construction

[0029] Specifically, the preparation method of the gold-zinc oxide heterojunction nanoparticle array may include the following steps:

[0030] Step A, mixing gold nanospheres, zinc nitrate, sodium hydroxide, and sodium borohydride in water so that the concentration of gold nanospheres in the mixed solution is 0.2 to 0.3 mmol / L, and the concentration of zinc nitrate is 0.001 to 0.008 mmol / L, the concentration of sodium hydroxide is 15-30 mmol / L, and the concentration of sodium borohydride is 5-20 mmol / L, and the precursor mixed solution is prepared. In practical application, the gold nanospheres are prepared by the following preparation method: adding chloroauric acid, diethylene glycol diacrylate phthalate (PDDA, as a surfactant), and hydrochloric acid to an ethylene glycol solvent , and heated to 195°C in an oil bath, kept for 30 minutes, and then wet-chemically etched with a small amount of hydrochloric acid to obtain a monodisperse colloidal solution of gold nanospheres; t...

Embodiment 1

[0042] A gold-zinc oxide heterojunction nanoparticle array, the preparation method of which comprises the following steps:

[0043] Step a1: Add chloroauric acid, diethylene glycol diacrylate phthalate (PDDA, as a surfactant), and hydrochloric acid into ethylene glycol solvent, and heat to 195° C. in an oil bath, and keep the temperature for 30 minutes. Then, a small amount of hydrochloric acid is used for wet chemical etching to obtain a monodisperse gold nanosphere colloidal solution; then, the gold nanosphere colloidal solution is centrifuged to obtain gold nanospheres.

[0044] Step b1: mixing gold nanospheres, zinc nitrate, sodium hydroxide, and sodium borohydride in water so that the concentration of gold nanospheres in the mixed solution is 0.25 mmol / L, the concentration of zinc nitrate is 0.002 mmol / L, hydrogen The concentration of sodium oxide is 30 mmol / L, and the concentration of sodium borohydride is 10 mmol / L to prepare a precursor mixed solution.

[0045] Step c...

Embodiment 2

[0049] A gold-zinc oxide heterojunction nanoparticle array, the preparation method of which comprises the following steps:

[0050] Step a2: Add chloroauric acid, diethylene glycol diacrylate phthalate (PDDA, as a surfactant), and hydrochloric acid into the ethylene glycol solvent, and heat it to 195° C. in an oil bath, and keep it warm for 30 minutes. Then, a small amount of hydrochloric acid is used for wet chemical etching to obtain a monodisperse gold nanosphere colloidal solution; then, the gold nanosphere colloidal solution is centrifuged to obtain gold nanospheres.

[0051] Step b2: Mix gold nanospheres, zinc nitrate, sodium hydroxide, and sodium borohydride in water so that the concentration of gold nanospheres in the mixed solution is 0.25 mmol / L, the concentration of zinc nitrate is 0.004 mmol / L, hydrogen The concentration of sodium oxide was 15 mmol / L, and the concentration of sodium borohydride was 10 mmol / L to prepare a precursor mixed solution.

[0052] Step c2:...

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Abstract

The invention discloses a gold-zinc oxide hetero-junction nano-particle array and a method for preparing the same. Gold-zinc oxide hetero-junction nano-particles in the gold-zinc oxide hetero-junctionnano-particle array have polygonal starry morphology, gold nano-spheres are used as centers, and zinc oxide nano-sheets grow around the gold nano-spheres in a non-close manner. The method includes mixing the gold nano-spheres, zinc nitrate, sodium hydroxide and sodium borohydride with one another in water to obtain precursor mixed solution; carrying out reaction on the precursor mixed solution atthe temperature of 60-100 DEG C for 10-60 minutes to obtain gold-zinc oxide hetero-junction nano-particle colloidal solution; centrifugally separating the gold-zinc oxide hetero-junction nano-particle colloidal solution, dispersing the gold-zinc oxide hetero-junction nano-particle colloidal solution into n-butanol solution, carrying out treatment by the aid of gas-solution interfacial self-assembly processes and fishing up monolayer nano-particle arrays by the aid of substrates. The monolayer nano-particle arrays float on solution surfaces. The gold-zinc oxide hetero-junction nano-particle array and the method have the advantages that the gold-zinc oxide hetero-junction nano-particle array has intense absorption peaks in ultraviolet regions and visible regions and is high in catalytic reaction efficiency; processes for preparing the gold-zinc oxide hetero-junction nano-particle array are simple and environmentally friendly and are low in cost and free of pollution, and accordingly thegold-zinc oxide hetero-junction nano-particle array and the method are suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of zinc oxide composite nanomaterials, in particular to a gold-zinc oxide heterojunction nanoparticle array and a preparation method thereof. Background technique [0002] Zinc oxide (ZnO) is a wide bandgap semiconductor material with excellent optical, catalytic, electrical, gas sensing, photoelectric conversion, photoelectric and piezoelectric properties. However, the absorption peaks of the existing zinc oxide nanoparticles are mainly concentrated in the ultraviolet region, and the absorption intensity is weak. In addition, the photogenerated electrons and holes are easy to recombine during the reaction, resulting in a significant reduction in the efficiency of the catalytic reaction. Contents of the invention [0003] In order to solve the technical problems that the absorption peak of the existing zinc oxide nanoparticles is mainly concentrated in the ultraviolet region, and the absorption intensity is relative...

Claims

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Application Information

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IPC IPC(8): C01G9/02B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G9/02C01P2002/72C01P2004/03B22F1/054
Inventor 李越温路路孙一强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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