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Zinc oxide/polypyrrole nano composite resistance-type film gas sensor and production method thereof

A gas sensor and pyrrole nanotechnology, applied in the direction of material resistance, can solve the problems of unsuitable batch preparation, etc., and achieve the effect of promoting response sensitivity, promoting synergistic effect, and increasing specific surface area

Inactive Publication Date: 2014-04-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires high-temperature calcination to prepare zinc oxide-titanium dioxide nanofibers, and its composite with polypyrrole is also prepared by dispersing nanofibers in a solution for in-situ polymerization, so it is difficult to directly deposit nanocomposites on electrodes to prepare resistive Gas sensor, not suitable for batch preparation

Method used

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  • Zinc oxide/polypyrrole nano composite resistance-type film gas sensor and production method thereof
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  • Zinc oxide/polypyrrole nano composite resistance-type film gas sensor and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use. The interdigitated gold electrodes are 5 pairs, the interdigitated gold electrodes have a fork width of 200 μm, and an interdigital gap of 200 μm ;

[0028] (2) In step (1), the surface of the interdigitated gold electrode with a ceramic substrate is coated with a zinc oxide nanocolloid solution with a concentration of 0.1 mol / liter. The solvent of the zinc oxide nanocolloid solution is ethanol, and the diameter of the zinc oxide particle is 75 nanometers, heated at 100°C for 2 h, with the surface of the interdigitated gold electrode facing down, horizontally immerse in the aqueous solution of zinc nitrate and hexamethylenetetramine, the concentration of zinc nitrate in the aqueous solution is 0.025 mol / L, hexamethylene The concentration of tetramine is 0.025 mol / liter, reacted at 90°C for 4 hours, then fully washed with deionized wat...

Embodiment 2

[0034] (1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use. The interdigitated gold electrodes are 5 pairs, the interdigitated gold electrodes have a fork width of 200 μm, and an interdigital gap of 200 μm ;

[0035] (2) In the step (1), the surface of the interdigitated gold electrode with a ceramic substrate is coated with a zinc oxide nanocolloid solution with a concentration of 0.4 mol / liter, and the solvent of the zinc oxide nanocolloid solution is N,N-dimethyl formazan Amide, the diameter of zinc oxide particles is 125 nanometers, heated at 100 ° C for 2 h, with the surface of the interdigitated gold electrode facing down, and horizontally immersed in an aqueous solution of zinc nitrate and hexamethylenetetramine, the concentration of zinc nitrate in the aqueous solution is 0.025 mol / L, the concentration of hexamethylenetetramine is 0.025 mol / L, react at 90°C for 4 hours, then fully wash...

Embodiment 3

[0038] (1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use. The interdigitated gold electrodes are 20 pairs, the interdigitated gold electrodes have a fork width of 20 μm, and an interdigital gap of 20 μm ;

[0039] (2) In step (1), the surface of the interdigitated gold electrode with a ceramic substrate is coated with a zinc oxide nanocolloid solution with a concentration of 0.05 mol / liter. The solvent of the zinc oxide nanocolloid solution is ethanol, and the diameter of the zinc oxide particle is 10 nanometers, heated at 230°C for 2 h, with the surface of the interdigitated gold electrode facing down, horizontally immerse in an aqueous solution of zinc nitrate and hexamethylenetetramine, the concentration of zinc nitrate in the aqueous solution is 0.02 mol / L, hexamethylene The concentration of tetraamine is 0.02 mol / liter, reacted at 100°C for 4 hours, then fully washed with deionized wate...

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Abstract

The invention discloses a zinc oxide / polypyrrole nano composite resistance-type film gas sensor and a production method thereof. The gas sensor comprises a ceramic substrate, a fork gold electrode and a gas sensitive film which are sequentially arranged, wherein the gas sensitive film is a zinc oxide / polypyrrole compound with a nano lamella structure, the large specific surface area of the nano compound is favorable for the adsorption and scattering of the gas, the n-type zinc oxide and the p-type polypyrrole nano lamella compounds are well contacted with each other to form a p / n node, and the interface resistance is small, so that the electrical property is remarkably changed after being subject to the influence of the adsorption gas, thus the gas sensor is high in response sensitivity on the ammonia gas under the room temperature and can be widely applied in the fields of precisely measuring and controlling the low-concentration ammonia gas in the industrial and agricultural production process and the atmosphere environment. The invention also provides a method for preparing the gas sensor. The method has the advantages of simplicity in preparation, low cost and the like and is applicable to the mass production.

Description

technical field [0001] The invention relates to an organic / inorganic nanocomposite resistive thin film gas sensor with high response sensitivity at room temperature and a manufacturing method thereof, especially a zinc oxide / polypyrrole nanocomposite resistive thin film gas sensor and a manufacturing method thereof. Background technique [0002] In the 21st century, as a favorable tool for obtaining information, the research and development of sensors has been widely valued. As an important class of chemical sensors, gas sensors have played an important role in many fields of human production and life, and have also developed rapidly. At the same time, the progress of society also puts forward higher requirements for the performance of gas sensors: the range of detection objects is constantly expanding, and the test sensitivity is also increasing. In order to meet the needs of social development, it is necessary to develop high-performance sensors with higher sensitivity, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 范开成李扬朱理智杨慕杰
Owner ZHEJIANG UNIV
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