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N-p heterogeneous core-shell array gas sensitive material and preparation method thereof

A gas-sensing material, n-p technology, applied in the direction of material resistance, can solve the problems of reducing the gas-sensitivity of the material, shortening the service life of the gas-sensing material, depletion of the interface electrons, etc., to achieve strong selectivity, high sensitivity, and improved energy band effect of structure

Active Publication Date: 2019-10-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the exposure of p-type materials to the air will lead to the depletion of interface electrons, which will reduce the gas sensitivity of the material and shorten the service life of the gas sensitive material.

Method used

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  • N-p heterogeneous core-shell array gas sensitive material and preparation method thereof
  • N-p heterogeneous core-shell array gas sensitive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The steps are:

[0025] Step 1: Preparation of porous alumina template

[0026] Select an aluminum oxide template with a 200nm double-pass aperture, magnetron sputter a layer of gold film with a thickness of 0.5μm on the back of the template, and then ultrasonically clean with trimethylsilyl cyanide, ethanol, and distilled water, and then dry for use;

[0027] Step 2: Sn nanotube array preparation

[0028] The Sn nanotube array is prepared by pulse electrodeposition in the electrolytic cell: the first step is to prepare the alumina template as the working electrode, the tin sheet as the counter electrode, and the tin wire as the auxiliary electrode. After adding the deposition solution, pulse electrodeposition is carried out. After completion, wash with distilled water to neutral, heat treatment at 200℃ for 1h;

[0029] The composition of the sedimentation liquid is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 And Na 3 C 6 H 5 O 7 ·2H 2 O;

[0030] The conditions of the pu...

Embodiment 2

[0038] The steps are:

[0039] Step 1: Preparation of porous alumina template

[0040] Select an aluminum oxide template with a 200nm double-pass aperture, magnetron sputter a layer of gold film with a thickness of 0.5μm on the back of the template, and then ultrasonically clean with trimethylsilyl cyanide, ethanol, and distilled water, and then dry for use;

[0041] Step 2: Sn nanotube array preparation

[0042] The Sn nanotube array is prepared by pulse electrodeposition in the electrolytic cell: the first step is to prepare the alumina template as the working electrode, the tin sheet as the counter electrode, and the tin wire as the auxiliary electrode. After adding the deposition solution, pulse electrodeposition is carried out. After completion, wash with distilled water to neutral, heat treatment at 120℃ for 5h;

[0043] The composition of the sedimentation liquid is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 And Na 3 C 6 H 5 O 7 ·2H 2 O;

[0044] The conditions of the pu...

Embodiment 3

[0052] The steps are:

[0053] Step 1: Preparation of porous alumina template

[0054] Select an aluminum oxide template with a 200nm double-pass aperture, magnetron sputter a layer of gold film with a thickness of 0.5μm on the back of the template, and then ultrasonically clean with trimethylsilyl cyanide, ethanol, and distilled water, and then dry for use;

[0055] Step 2: Sn nanotube array preparation

[0056] The Sn nanotube array is prepared by pulse electrodeposition in the electrolytic cell: the first step is to prepare the alumina template as the working electrode, the tin sheet as the counter electrode, and the tin wire as the auxiliary electrode. After adding the deposition solution, pulse electrodeposition is carried out. After completion, wash with distilled water to neutral, heat treatment at 150℃ for 3h;

[0057] The composition of the sedimentation liquid is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 And Na 3 C 6 H 5 O 7 ·2H 2 O;

[0058] The conditions of the pu...

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Abstract

The invention relates to an n-p heterogeneous core-shell array gas sensitive material and a preparation method thereof, in particular to a NiO@SnO2 core-shell array gas sensitive material which uses p-type nano NiO as a core and n-type nano SnO2 as a shell and is a highly ordered nano array on the whole and a preparation method thereof. On one hand, the gas sensitive material provided by the invention avoids the exhausting of interface electrons due to direct exposure of the p-type NiO in the core layer to the air. On the other hand, the energy band structure of the gas sensitive material is improved by using the n-type SnO2 in the shell layer, and the overall ordered array increases the number of active contact points and improves the gas sensitivity of the gas sensitive material. The method provided by the invention has the advantages of a wide range of raw materials and low price. The n-p heterogeneous NiO@SnO2 core-shell array gas sensitive material obtained has high sensitivity and strong selectivity.

Description

Technical field [0001] The invention relates to the field of gas-sensitive materials, in particular to a method for preparing n-p heterogeneous core-shell array gas-sensitive materials. Background technique [0002] In recent years, with the rapid growth of my country’s car ownership, a large amount of NOx (mainly NO 2 And NO), which will seriously affect air quality and cause PM2.5 to soar. In response to the increasingly prominent problem of air pollution, the state issued the "People's Republic of China Air Pollution Prevention and Control Law" (revised version) on October 26, 2018. Therefore, prevention and control of air pollution and monitoring of gas pollution sources are of high urgency. At present, commercialized NO for atmospheric detection 2 The sensor is mainly based on electrochemical principles, its structure is complicated, the price is expensive, and the response speed is slow. Therefore, development is aimed at NO 2 The rapid, high-sensitivity, low-concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 张肖鑫徐靖才王新庆洪波金红晓彭晓领金顶峰葛洪良
Owner CHINA JILIANG UNIV
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