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Zinc oxidenanorod-carbon nanotubealcohol sensor and preparation method thereof

A technology of zinc oxide nanorods and carbon nanotubes, applied in the direction of material resistance, can solve the problems of poor response recovery characteristics and low sensitivity, and achieve the effects of high sensitivity, low cost, and high surface adsorption capacity

Inactive Publication Date: 2017-09-08
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

ZnO is one of the most widely used gas-sensing materials at present. Many studies on ZnO nanostructured gas sensors have been reported. However, a single zinc oxide as a sensor still has a series of bottlenecks, including low sensitivity and response recovery characteristics. Inferior disadvantages limit its further application
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  • Zinc oxidenanorod-carbon nanotubealcohol sensor and preparation method thereof
  • Zinc oxidenanorod-carbon nanotubealcohol sensor and preparation method thereof
  • Zinc oxidenanorod-carbon nanotubealcohol sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] like figure 1 , figure 2 The shown zinc oxide nanorod-carbon nanotube ethanol sensor includes a ceramic tube 1 , a sensitive layer 2 on the ceramic tube, a test electrode 3 and a heating electrode 4 . A ceramic tube (about 4.1 mm in length, about 1.0 mm in inner diameter, and about 1.4 mm in outer diameter) is attached with gold electrodes at both ends, and 4 Pt wires are drawn from the gold electrodes as test electrodes; a helical nickel-chromium alloy wire runs through the ceramic tube, as a heating electrode; wherein, the sensitive layer is a zinc oxide nanorod-carbon nanotube composite material, covering the surface of the ceramic tube and between two gold electrodes.

[0033] The preparation process of zinc oxide nanorod-carbon nanotube ethanol sensor is as follows:

[0034] Preparation of zinc oxide nanorods: first, a mixed solution of zinc nitrate (0.05M), urotropine (0.05M), ammonia water (0.05M) and polyethyleneimine (2mM) was prepared with ultrapure water. ...

Embodiment 2

[0043]The structure and preparation steps of the zinc oxide nanorod-carbon nanotube ethanol sensor are as in Example 1, the mass fraction content of the carbon nanotubes in the zinc oxide nanorod-carbon nanotube composite material is reduced from 25% to 10%, and the obtained The sensitivity of the gas sensor to 50ppm concentration of ethanol was reduced from 16 to 8.

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Abstract

The invention discloses a zinc oxidenanorod-carbon nanotubealcohol sensor and a preparation method thereof, and belongs to the technical field of gas detection. Thealcohol sensor comprises a ceramic tube, a sensitive layer on the ceramic tube, a testing electrode and a heating electrode, wherein the sensitive layeris made of a zinc oxidenanorod-carbon nanotubecompositematerial. The preparation method of the sensor comprises the following steps: firstly, preparing the zinc oxidenanorod-carbon nanotubecompositematerial; secondly, preparing an indirectly heatedsinteredgas-sensitive element. The lower detection limit of the gas-sensitive sensor to alcohol reaches 2ppm, and meanwhile the sensor has short response time, relatively high repetition stability and relatively high sensitivity.

Description

technical field [0001] The invention relates to a gas sensor and a preparation method thereof, in particular to an ethanol sensor with a zinc oxide nanorod-carbon nanotube as a sensitive film and a preparation method thereof, belonging to the technical field of gas detection. Background technique [0002] The development of new sensors with high sensitivity and fast response is of great significance to environmental monitoring, people's health, military defense and so on. ZnO is one of the most widely used gas-sensing materials at present. Many studies on ZnO nanostructured gas sensors have been reported. However, a single zinc oxide as a sensor still has a series of bottlenecks, including low sensitivity and response recovery characteristics. Inferior shortcomings limit its further application. Therefore, it is necessary to combine zinc oxide with other materials to realize the integration of materials and functions, and to exert the advantages of the two materials. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 李翠平曹菲菲李明吉李红姬杨天琦吴小国杨保和
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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