Method for preparing nickel oxide/zinc oxide heterojunction nanometer materials

A nanomaterial, zinc oxide technology, applied in the field of preparation of nickel oxide/zinc oxide heterojunction nanomaterials, can solve problems such as low sensitivity

Active Publication Date: 2016-07-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of low sensitivity of nickel oxide / zinc oxide heterojunction nanomaterials prepared by existing methods, the present invention provides a preparation method of nickel oxide / zinc oxide heterojunction nanomaterials

Method used

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  • Method for preparing nickel oxide/zinc oxide heterojunction nanometer materials
  • Method for preparing nickel oxide/zinc oxide heterojunction nanometer materials
  • Method for preparing nickel oxide/zinc oxide heterojunction nanometer materials

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Step 1. Completely dissolve nickel acetate tetrahydrate: zinc nitrate hexahydrate: sodium hydroxide in distilled water at a molar ratio of 1:4:10, and magnetically stir for 10 minutes to make it a uniform and clear solution;

[0018] Step 2. Transfer the solution obtained in step 1 to a high-pressure reactor, seal it, heat it at 80°C for 18 hours, wash and centrifuge the product repeatedly with distilled water and absolute ethanol until the pH value of the solution is neutral, and place the obtained product in an oven at 50°C to dry Dry for 10 hours to obtain nickel oxide / zinc oxide heterojunction calcined powder;

[0019] Step 3. Calcining the nickel oxide / zinc oxide pre-calcined powder obtained in step 2 in a muffle furnace, the heating rate is 3°C / min, the calcination temperature is 300°C, and the calcination time is 3h to obtain nickel oxide / zinc oxide Zinc heterojunction nanomaterials.

[0020] From figure 1 It can be seen from the X-ray diffraction pattern of (a...

Embodiment 2

[0022] Step 1. Completely dissolve nickel acetate tetrahydrate: zinc nitrate hexahydrate: sodium hydroxide in distilled water at a molar ratio of 1:9:20, and magnetically stir for 15 minutes to make it a uniform and clear solution;

[0023] Step 2. Transfer the solution obtained in step 1 to a high-pressure reactor, seal it and heat it at 90°C for 12 hours, wash and centrifuge the product repeatedly with distilled water and absolute ethanol until the pH of the solution is neutral, and place the obtained product in an oven at 60°C to dry Dry for 8 hours to obtain nickel oxide / zinc oxide heterojunction calcined powder;

[0024] Step 3. Calcining the nickel oxide / zinc oxide pre-calcined powder obtained in step 2 in a muffle furnace, the heating rate is 5°C / min, the calcination temperature is 350°C, and the calcination time is 2h, to obtain nickel oxide / zinc oxide Zinc heterojunction nanomaterials.

[0025] From figure 1 It can be seen from the X-ray diffraction pattern of (b) t...

Embodiment 3

[0027] Step 1. Completely dissolve nickel acetate tetrahydrate: zinc nitrate hexahydrate: sodium hydroxide in distilled water at a molar ratio of 1:19:40, and magnetically stir for 20 minutes to make it a uniform and clear solution;

[0028] Step 2. Transfer the solution obtained in step 1 to a high-pressure reactor, seal it, heat it at 100°C for 6 hours, wash and centrifuge the product repeatedly with distilled water and absolute ethanol until the pH of the solution is neutral, and place the obtained product in an oven at 70°C to dry Dry for 6 hours to obtain nickel oxide / zinc oxide heterojunction calcined powder;

[0029] Step 3. Calcining the nickel oxide / zinc oxide pre-calcined powder obtained in step 2 in a muffle furnace, the heating rate is 8°C / min, the calcination temperature is 400°C, and the calcination time is 1h to obtain nickel oxide / zinc oxide Zinc heterojunction nanomaterials.

[0030] From figure 1 It can be seen from the X-ray diffraction pattern of (c) that...

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Abstract

The invention discloses a method for preparing nickel oxide/zinc oxide heterojunction nanometer materials. By the aid of the method, the technical problem of low sensitivity of nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of existing methods can be solved. The technical scheme includes that the method comprises synthesizing nickel oxide/zinc oxide heterojunction pre-sintered powder from mixed solution by the aid of a one-step hydrothermal process; calcining the nickel oxide/zinc oxide heterojunction pre-sintered powder to obtain the nickel oxide/zinc oxide heterojunction nanometer materials. The mixed solution is prepared from nickel acetate tetrahydrate, zinc nitrate hexahydrate and sodium hydroxide. The method has the advantages that the method only includes one reaction step instead of two reaction steps in the prior art, and the reaction time is shortened and is 12 h instead of the reaction time of 60 h in the prior art; as shown in gas sensitivity tests, the working temperatures of gas sensors made of the nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of the method are lowered and are 200 DEG C instead of the working temperatures of 330 DEG C in the prior art; the sensitivity of the gas sensors for 100 ppm acetone gas is improved and reaches 15-17 instead of the sensitivity of 12 in the prior art.

Description

technical field [0001] The invention relates to a preparation method of a nano material, in particular to a preparation method of a nickel oxide / zinc oxide heterojunction nano material. Background technique [0002] Since the beginning of the 21st century, people have paid more and more attention to environmental pollution and energy shortages, and more and more scientific researches have been conducted on these two aspects. Zinc oxide is a common metal oxide semiconductor. Due to its optical, electrical, magnetic and other properties, zinc oxide is widely used in photocatalysts, gas-sensitive materials, dielectric materials and other fields. Among them, zinc oxide is an important class of gas-sensitive materials, which can monitor toxic and harmful pollutant gases in the environment. However, many problems such as low sensitivity, high working temperature, and poor selectivity of zinc oxide gas-sensitive materials are also problems that need to be solved urgently. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G9/02G01N27/00B82Y40/00
CPCC01G9/02C01G53/04C01P2002/72C01P2004/03C01P2004/82G01N27/00
Inventor 樊慧庆田海林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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