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Tin oxide-zinc oxide composite hollow microsphere gas sensor device and preparation method

A gas sensor, hollow microsphere technology, applied in the direction of material resistance, can solve the problems of poor gas selectivity and short response time, and achieve the effects of stable performance, simple production and improved response time

Active Publication Date: 2016-05-25
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, individual zinc oxide or tin oxide materials have poor selectivity to gases. By preparing tin oxide-zinc oxide composite materials, the advantages of the two materials can be comprehensively utilized to realize the preparation of gas sensors with high sensitivity and short response time.

Method used

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  • Tin oxide-zinc oxide composite hollow microsphere gas sensor device and preparation method
  • Tin oxide-zinc oxide composite hollow microsphere gas sensor device and preparation method
  • Tin oxide-zinc oxide composite hollow microsphere gas sensor device and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Weigh 2g of block polymer P123, dissolve it in 25ml of absolute ethanol; add 0.43g of zinc acetate and 0.8ml of diethanolamine, and stir at room temperature for 3 hours to obtain a zinc precursor solution; weigh 0.12 g of stannous chloride was placed in the zinc precursor solution and stirred for 1 hour; the tin-zinc precursor solution was placed in a reaction kettle and reacted at 180°C for 24 hours; centrifuged and washed 3 times with alcohol and water respectively to obtain the oxidation Tin-zinc oxide composite hollow microspheres; dissolve the microspheres in absolute ethanol to obtain a paste; clean the alumina ceramic tube with deionized water, acetone, and chloroform, dry it, and put tin oxide-zinc oxide composite hollow microspheres The paste is uniformly coated on the surface of the ceramic tube, electrodes are welded and packaged to obtain a gas sensor. The diameter of the microspheres is between 2.5 and 3 microns, and the resistance response rate ...

Embodiment 2

[0028] Embodiment 2: Take the block polymer polystyrene-polyoxyethylene of 2.5g, be dissolved in the dehydrated alcohol of 30ml; Add the diethanolamine of the zinc acetate of 0.6g and 0.8ml, stir at room temperature for 3 hours to obtain zinc Precursor solution; weigh 0.15g of stannous chloride and place it in the zinc precursor solution, stir for 1 hour; place the tin-zinc precursor solution in a reaction kettle, and react at 180°C for 24 hours; use alcohol and water respectively Centrifuge and wash 3 times to obtain tin oxide-zinc oxide composite hollow microspheres; dissolve the microspheres in absolute ethanol to obtain a paste; clean the alumina ceramic tube with deionized water, acetone, and chloroform, dry it, and dissolve the tin oxide - The zinc oxide composite hollow microsphere paste is evenly coated on the surface of the ceramic tube, the electrodes are welded and packaged to obtain a gas sensor. The diameter distribution of tin oxide-zinc oxide composite hollow mi...

Embodiment 3

[0029] Example 3: Weigh 2g of block polymer P123, dissolve it in 30ml of deionized water; add 0.1g of zinc acetate and 1ml of diethanolamine, and stir at room temperature for 3 hours to obtain a zinc precursor solution; weigh 0.45g of Put stannous chloride in the zinc precursor solution and stir for 1 hour; put the tin-zinc precursor solution in a reaction kettle and react at 180°C for 24 hours; wash with alcohol and water for 3 times, respectively, to obtain tin oxide- Zinc oxide composite hollow microspheres; dissolve the microspheres in absolute ethanol to obtain a paste; clean the alumina ceramic tube with deionized water, acetone, and chloroform, dry it, and make the tin oxide-zinc oxide composite hollow microspheres into a paste The substance is evenly coated on the surface of the ceramic tube, and the electrodes are welded and packaged to obtain a gas sensor. The size distribution of the microspheres obtained by changing the ratio of tin and zinc is in the range of 2 to...

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Abstract

The invention discloses a tin oxide-zinc oxide composite hollow microsphere air-sensitive sensing device and a preparation method thereof, wherein tin oxide-zinc oxide composite hollow microspheres are prepared by a template method; the air-sensitive sensing device is of an indirectly heated device structure; an alumina ceramic tube is taken as a carrier for the air-sensitive sensing device, a heater strip is arranged inside the ceramic tube, a gold electrode is attached on the outer surface of the ceramic tube, and electrodes are extracted from the two ends of the ceramic tube. The ceramic tube is coated with a tin oxide-zinc oxide composite hollow microsphere air-sensitive material, and then welded and packaged; consequently, an air-sensitive sensing device is obtained. The tin oxide-zinc oxide composite hollow microsphere air-sensitive sensing device has the advantages that the large-specific surface area metal oxide is used as the air-sensitive material so that the active vacancies of the material surface are greatly increased, and the response ratio and the response time of an air-sensitive sensor are increased. The air-sensitive sensing device provided by the invention is simple to fabricate, stable in performance, high in sensitivity; the air-sensitive sensing device is highly sensitive to ethanol at a working temperature and can be used for detecting ethanol.

Description

technical field [0001] The invention relates to a gas sensitive sensing device and a manufacturing method thereof, in particular to a tin oxide-zinc oxide composite hollow microsphere gas sensing sensing device and a manufacturing method thereof. Background technique [0002] Semiconductor metal oxide nanomaterial gas sensor has become the best material for gas sensor due to its advantages of high sensitivity, fast response, small size, simple manufacturing method and low price. At present, the development of new gas-sensing materials and new gas-sensing devices has become one of the main directions for the development of semiconductor gas-sensing sensors at home and abroad. [0003] Due to the adjustable pore structure, high specific surface area and strong ion exchange performance of zinc oxide microspheres, it is beneficial for the reactants to react at the active site during the catalytic process, and has shown great promise in the detection of ethanol, acetone, formalde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 葛美英尹桂林姜来新何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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