A kind of n-p heterogeneous core-shell array gas-sensing material and its preparation method

A gas-sensitive material, n-p technology, applied in the direction of material resistance, etc., can solve the problems of interface electron depletion, reduce the gas sensitivity of materials, shorten the service life of gas-sensitive materials, etc., and achieve the effect of strong selectivity and high sensitivity

Active Publication Date: 2021-11-19
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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  • A kind of n-p heterogeneous core-shell array gas-sensing material and its preparation method
  • A kind of n-p heterogeneous core-shell array gas-sensing material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The steps are:

[0025] Step 1: Porous alumina template preparation

[0026] Select an aluminum oxide template with a pore size of 200nm and double-pass, magnetron sputtering a layer of gold film with a thickness of 0.5μm on the back of it, and then after ultrasonic cleaning with trimethylsilyl cyanide, ethanol, and distilled water, dry it for later use;

[0027] The second step: Sn nanotube array preparation

[0028] Sn nanotube arrays were prepared by pulse electrodeposition in the electrolytic cell: the alumina template was prepared in the first step as the working electrode, the tin sheet was used as the counter electrode, and the tin wire was used as the auxiliary electrode. Pulse electrodeposition was performed after adding the deposition solution. After completion, wash with distilled water until neutral, and heat-treat at 200°C for 1 hour;

[0029] The composition of the deposition solution is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 and Na 3 C...

Embodiment 2

[0038] The steps are:

[0039] Step 1: Porous alumina template preparation

[0040] Select an aluminum oxide template with a pore size of 200nm and double-pass, magnetron sputtering a layer of gold film with a thickness of 0.5μm on the back of it, and then after ultrasonic cleaning with trimethylsilyl cyanide, ethanol, and distilled water, dry it for later use;

[0041] The second step: Sn nanotube array preparation

[0042] Sn nanotube arrays were prepared by pulse electrodeposition in the electrolytic cell: the alumina template was prepared in the first step as the working electrode, the tin sheet was used as the counter electrode, and the tin wire was used as the auxiliary electrode. Pulse electrodeposition was performed after adding the deposition solution. After completion, wash with distilled water until neutral, and heat-treat at 120°C for 5 hours;

[0043] The composition of the deposition solution is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 and Na 3 ...

Embodiment 3

[0052] The steps are:

[0053] Step 1: Porous alumina template preparation

[0054] Select an aluminum oxide template with a pore size of 200nm and double-pass, magnetron sputtering a layer of gold film with a thickness of 0.5μm on the back of it, and then after ultrasonic cleaning with trimethylsilyl cyanide, ethanol, and distilled water, dry it for later use;

[0055] The second step: Sn nanotube array preparation

[0056] Sn nanotube arrays were prepared by pulse electrodeposition in the electrolytic cell: the alumina template was prepared in the first step as the working electrode, the tin sheet was used as the counter electrode, and the tin wire was used as the auxiliary electrode. Pulse electrodeposition was performed after adding the deposition solution. After completion, wash with distilled water until neutral, and heat-treat at 150°C for 3 hours;

[0057] The composition of the deposition solution is: 0.1mol / L SnCl 4 ·5H 2 O, 0.01 mol / L NaCl, H 3 BO 3 and Na 3 ...

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Abstract

The invention relates to an n-p heterogeneous core-shell array gas-sensing material and a preparation method, in particular to a p-type nano-NiO as the core and an n-type nano-SnO 2 The core-shell monomer is a shell, and the whole is a highly ordered nano-array of NiO@SnO 2 Core-shell array gas-sensing material and preparation method. On the one hand, the gas-sensitive material of the invention avoids the depletion of interface electrons caused by the direct exposure of the p-type NiO in the core layer to the air; on the other hand, it utilizes the n-type SnO in the shell layer 2 The energy band structure of the gas-sensing material is improved, and the overall ordered array increases the active contact point, which improves the sensitivity of the gas-sensing material to gas. The method adopted in the present invention has a wide range of sources of raw materials and low prices; the obtained n-p heterogeneous NiO@SnO 2 The core-shell array gas-sensing material has high sensitivity and strong selectivity.

Description

technical field [0001] The invention relates to the field of gas-sensing materials, in particular to a preparation method of an n-p heterogeneous core-shell array gas-sensing material. Background technique [0002] In recent years, with the rapid growth of automobile ownership in my country, a large amount of NOx (mainly NOx 2 and NO), will seriously affect the air quality, causing PM2.5 to soar. In response to the increasingly prominent problem of air pollution, on October 26, 2018, the state promulgated the "Law of the People's Republic of China on the Prevention and Control of Air Pollution" (amended version). Therefore, the prevention and control of air pollution and the monitoring of gas pollution sources are of high urgency. At present, the commercial NO 2 The sensor is mainly based on the principle of electrochemistry, its structure is complicated, the price is expensive, and the response speed is slow. Therefore, the development of NO 2 The rapid, high-sensitivi...

Claims

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Application Information

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Patent Type & Authority Patents(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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