Electrode surface in-situ growth nano ZnO based NO2 sensor

An in-situ growth, electrode surface technology, applied in instruments, scientific instruments, material analysis by electromagnetic means, etc., can solve the problems of slow response/recovery, complex preparation process, etc., to achieve short response and recovery time, simple preparation, Solve the effect of complex preparation process

Active Publication Date: 2017-07-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current complex process for preparing ZnO nanowire arrays and its shortcomings in gas-sensing characteristics, the present invention provides a NO 2 The sensor and its preparation method aim to form a ZnO seed layer on the electrode surface in advance by thermal decomposition method, and then prepare a ZnO nanowire array with good crystallization and high aspect ratio on the electrode surface by hydrothermal method, and finally undergo heat treatment and aging After treatment, it is directly assembled into NO with the advantages of high sensitivity, good reversibility, rapid response / recovery, and excellent selectivity. 2 sensor to overcome existing NO 2 The sensor has deficiencies such as complex preparation process and slow response / recovery

Method used

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  • Electrode surface in-situ growth nano ZnO based NO2 sensor
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  • Electrode surface in-situ growth nano ZnO based NO2 sensor

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Effect test

Embodiment 1

[0045] NO in situ growth of ZnO nanowire arrays on the surface of ceramic tube electrode components 2 The sensor element, its structure diagram is shown in figure 1 As shown, it consists of ceramic tubes, gold electrodes, platinum leads, and layers of gas-sensing materials. The gold electrode is covered on the surface of the ceramic tube, the platinum lead wire is welded on the surface of the gold electrode, and the gas-sensitive material is grown on the entire surface of the ceramic tube and the gold electrode. The gas-sensing material is composed of ZnO nanowire arrays, which are evenly distributed and grown on the surface of the electrode element. The ZnO nanowires have a regular shape, a smooth surface, and a single hexagonal wurtzite crystal structure, with a diameter of 80-100nm , the length is 600nm~1μm, and the aspect ratio is high.

[0046] A gas-sensing material for NO based on in-situ growth of ZnO nanowire arrays on the surface of ceramic electrodes 2 The sensor...

Embodiment 2

[0058] NO in situ growth of ZnO nanowire arrays on the surface of ceramic tube electrode components 2 The sensor element, its structure diagram is shown in figure 1 As shown, it consists of ceramic tubes, gold electrodes, platinum leads, and layers of gas-sensing materials. The gold electrode is covered on the surface of the ceramic tube, the platinum lead wire is welded on the surface of the gold electrode, and the gas-sensitive material is grown on the entire surface of the ceramic tube and the gold electrode. The gas-sensing material is composed of ZnO nanowire arrays, which are evenly distributed and grown on the surface of the electrode element. The ZnO nanowires have regular appearance, smooth surface, and a single hexagonal wurtzite crystal structure, with a diameter of 80- 100nm, length 600nm ~ 1μm, high aspect ratio.

[0059] A kind of NO based on in-situ growth of ZnO nanowire array gas-sensing material on the surface of ceramic tube electrode element 2 The sensor...

Embodiment 3

[0069] NO in situ growth of ZnO nanowire arrays on the surface of ceramic tube electrode components 2 The sensor element, its structure diagram is shown in figure 1 As shown, it consists of ceramic tubes, gold electrodes, platinum leads, and layers of gas-sensing materials. The gold electrode is covered on the surface of the ceramic tube, the platinum lead wire is welded on the surface of the gold electrode, and the gas-sensitive material is grown on the entire surface of the ceramic tube and the gold electrode. The gas-sensing material is composed of ZnO nanowire arrays, which are evenly distributed and grown on the surface of the electrode element. The ZnO nanowires have regular appearance, smooth surface, and a single hexagonal wurtzite crystal structure, with a diameter of 80- 100nm, length 600nm ~ 1μm, high aspect ratio.

[0070] A kind of NO based on in-situ growth of ZnO nanowire array gas-sensing material on the surface of ceramic tube electrode element 2 The sensor...

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Abstract

The invention relates to an electrode surface in-situ growth nano ZnO based NO2 sensor and belongs to the technical field of gas sensors of one-dimensional semiconductor metal oxide materials. The electrode surface in-situ growth nano ZnO based NO2 sensor is characterized by being obtained through in-situ growth ZnO nanowire arrays on the electrode elements, a ZnO nanowires are 80-100nm in diameter and 600nm-1umm in length, and the crystal structure of the ZnO nanowires is of the hexagonal-phase wurtzite crystal structure. The gas sensor acquiring maximum sensitivity on NO2 gas in the working temperature of 250DEG C is short in response and recovery time, good in reversibility and selectivity and good in development prospect.

Description

technical field [0001] The invention belongs to the technical field of gas sensors of one-dimensional semiconductor metal oxide materials, in particular to a NO sensor based on the in-situ growth of ZnO nanowire arrays on the electrode surface 2 Sensors and methods of making them. Background technique [0002] Nitrogen dioxide (NO 2 ) is a poisonous and harmful gas, mainly from fuel combustion, industrial production process, city vehicle exhaust, etc. NO 2 The gas can lead to the formation of acid rain and photochemical smog, which can endanger human health and cause the destruction of surface vegetation in excess. Therefore to NO 2 Effective and real-time monitoring of gas can not only effectively avoid the occurrence of potential safety accidents, but also provide for the follow-up NO 2 Gas treatment provides a reliable upfront guarantee. [0003] In recent years, gas sensors based on different gas-sensing materials and conduction platforms have been developed rapidl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 沈岩柏陈享享钟祥熙李停停魏德洲韩聪崔宝玉
Owner NORTHEASTERN UNIV
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