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Formaldehyde air-sensitive material and its preparation method and preparation method for formaldehyde air-sensitive device

A formaldehyde gas and device technology, applied in the direction of material resistance, etc., can solve the problems that have not yet been commercialized, and achieve the effects of low working temperature, high resolution, and good selectivity

Inactive Publication Date: 2008-03-19
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

As for the formaldehyde gas sensor, it is in the stage of exploration and research in China, and has not yet been commercialized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Manufacturing steps of formaldehyde gas sensor:

[0028] 1. SnO 2 -TiO 2 Preparation of Binary Nanocomposite Powders

[0029] Take 10ml Ti(OC 4 h 9 ) 4 Under the condition of stirring, add it dropwise to 26ml of absolute ethanol, and continue to stir for 30min to obtain a light yellow transparent solution A; calculate the molar ratio of Sn and Ti as 0.3 to take SnCl 4 ·5H 2 Add O into solution A, stir to make the solution uniform and transparent, and obtain liquid B; mix 20ml of absolute ethanol, 2ml of 1mol / L HCl aqueous solution and 2ml of distilled water to obtain a colorless and transparent solution C; put solution C under stirring conditions Add it dropwise to solution B to obtain a light yellow transparent solution, continue to stir for 2 hours, then seal it and let it stand, and obtain yellow-white gel particles after vacuum drying; grind and refine the dry gel, and calcinate it at 450°C for 2 hours , that is, get SnO 2 -TiO 2 Binary nanocomposite powder...

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Abstract

The invention relates to a formaldehyde gas sensitive material, the preparation method thereof and a manufacture method of a formaldehyde gas sensitive component. The component of the formaldehyde gas sensitive material takes an SnO2-TiO2 binary nanometer composite material as a substrate, the mol ratio of the Ti / Sn is 0.2 to 0.5, the fractional ratio of the quality adulterated is 2 percent to 5 percent Cd2, the formaldehyde gas sensitive material is adjusted to be pasty after being ground with an appropriate amount absolute ethyl alcohol and 0.2 to 1 portion polyethylene glycol, and is painted on the surface of an electrode pipe evenly, and a formaldehyde gas sensitive electrode pipe is produced through 400 degree annealing processing for two to four hours; finally a formaldehyde gas sensitive component is made through the welding, the electrical ageing and the sealing to the gas sensitive electrode pipe according to the heater type structure traditional process. The gas sensitive sensor made through the invention has low operating temperature, has high sensitivity to the formaldehyde gas, has good antiinterference performance to other indoor pollutant gases, such as benzene, toluene, xylene and ammonia, etc, the response time and the recovery time are short, and the gas sensitive sensor is used for the detection to the indoor decorating formaldehyde gas pollution.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor gas-sensing elements, and in particular relates to a formaldehyde gas-sensing material, a preparation method thereof, and a manufacturing method of a formaldehyde gas-sensing device. Background technique [0002] Formaldehyde is a protoplasmic poison that destroys the protein of biological cells. It can cause damage to human skin, respiratory tract and internal organs, anesthetize the central nervous system, and cause pulmonary edema, hepatic coma, and kidney failure. At present, the problem of formaldehyde pollution is concentrated in the living room and decoration materials. Plywood, fiberboard, and other man-made panels in living room decoration materials and furniture contain a large amount of formaldehyde-based urea-formaldehyde resin, and various paints and coatings contain formaldehyde. The problem of formaldehyde pollution is a serious threat to human health and should a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 林志东曾文
Owner WUHAN INSTITUTE OF TECHNOLOGY
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