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A gold-zinc oxide heterojunction nanoparticle array and its preparation method

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, The effect of simple preparation process

Active Publication Date: 2021-03-23
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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  • A gold-zinc oxide heterojunction nanoparticle array and its preparation method
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  • A gold-zinc oxide heterojunction nanoparticle array and its preparation method

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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 heterojunction nanoparticle array and a preparation method thereof. In the gold-zinc oxide heterojunction nanoparticle array, the shape of the gold-zinc oxide heterojunction nanoparticle is a polygonal star , with gold nanospheres as the center, ZnO nanosheets grow non-compactly around the gold nanospheres. The preparation method comprises: mixing gold nanospheres, zinc nitrate, sodium hydroxide and sodium borohydride in water to prepare a precursor mixed solution; then reacting it at 60-100°C for 10-60 minutes to prepare A gold-zinc oxide heterojunction nanoparticle colloidal solution was obtained, and then centrifuged, then dispersed in n-butanol solution, processed by the gas-liquid interface self-assembly method, and the single-layer nanoparticle floating on the liquid surface was processed with a substrate. The particle array can be scooped up. The invention not only has strong absorption peaks in the ultraviolet region and the visible region, and has high catalytic reaction efficiency, but also has simple preparation process, low cost, environmental protection and no pollution, and is 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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Patent Type & Authority Patents(China)
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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