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A kind of humidity sensitive material and preparation method thereof

A humidity-sensitive, magnesium-salt technology, applied in the sensing field, can solve the problems of poor long-term stability and insufficient sensitivity of humidity-sensitive materials, and achieve the effects of stable performance, easy long-term storage and use, and simple preparation process.

Inactive Publication Date: 2015-12-09
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem facing the development of humidity sensors at present is that the sensitivity of humidity-sensitive materials is not high enough and the long-term stability is poor. Therefore, the preparation of humidity-sensitive materials with high sensitivity, fast response and high stability is of great significance to the improvement of the performance of humidity sensors.

Method used

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  • A kind of humidity sensitive material and preparation method thereof
  • A kind of humidity sensitive material and preparation method thereof
  • A kind of humidity sensitive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Co-dissolve magnesium oxalate dihydrate and stannous sulfate in aqueous hydrochloric acid solution with a mass fraction of 3%, add an appropriate amount of tartaric acid under high-speed stirring to keep the solution in a clear state for more than 20 hours, and adjust the pH value of the solution to 3.0 with dilute ammonia water , continue to stir for 5 hours, let it stand for aging, rotate the solution at 76°C to obtain a gel, dry the gel by infrared for 2 hours, grind it thoroughly, and place it in a high-temperature box-type resistance furnace at a speed of no more than 3°C per minute Raise the temperature to 450°C and keep this temperature for 5 hours to obtain MgO and SnO 2 Composite powder;

[0020] (2) Dissolve tetrabutyl titanate and tartaric acid in water, add the above-mentioned composite powder that has been dispersed by ultrasonic waves under constant stirring, continue to stir and mix evenly, directly place it in a drying oven to dry, and after fully gr...

Embodiment 2

[0024] (1) Co-dissolve magnesium nitrate hexahydrate and stannous chloride dihydrate in aqueous hydrochloric acid solution with a mass fraction of 4%, add an appropriate amount of tartaric acid under high-speed stirring to keep the solution in a clear state for more than 20 hours, and adjust the pH of the solution with dilute ammonia The value is 3.1, continue to stir for 6 hours, let it stand for aging, rotate the solution at 78 ° C to obtain a gel, dry the gel for 2 hours in infrared, grind it thoroughly, and place it in a high-temperature box-type resistance furnace at a rate of no more than 3 per minute. °C speed to 460 °C, keep this temperature for 5 hours to get MgO and SnO 2 Composite powder;

[0025] (2) Dissolve titanium acetate, titanium tetrachloride and tartaric acid in water, add the above-mentioned composite powder dispersed by ultrasonic waves under continuous stirring, continue to stir and mix evenly, directly put it in a drying oven for drying, and fully grind...

Embodiment 3

[0029] (1) Co-dissolve magnesium sulfate heptahydrate and tin chloride pentahydrate in hydrochloric acid aqueous solution with a mass fraction of 6%, add appropriate amount of tartaric acid under high-speed stirring to keep the solution in a clear state for more than 20 hours, and adjust the pH value of the solution with dilute ammonia If it is 3.2, continue to stir for 7 hours, let it stand for aging, rotate the solution at 80°C to obtain a gel, dry the gel by infrared for 2 hours, grind it thoroughly, and place it in a high-temperature box-type resistance furnace at a rate of no more than 3°C per minute. The speed is raised to 470 ° C, and this temperature is maintained for 5 hours to obtain MgO and SnO 2 Composite powder;

[0030] (2) Dissolve titanium sulfate nonahydrate and tartaric acid in water, add the above-mentioned composite powder dispersed by ultrasonic waves under continuous stirring, continue to stir and mix evenly, directly place it in a drying oven to dry, and...

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Abstract

The invention relates to a humidity sensitive material and a preparation method thereof. The humidity sensitive material consists of nano composite oxides, namely MgO, SnO2 and TiO2. The preparation method of the humidity sensitive material comprises the steps of co-dissolving magnesium salt and tin salt in a hydrochloric acid aqueous solution, adding tartaric acid in a high-speed stirring state, regulating a pH (potential of hydrogen) value of the solution with weak aqua ammonia, obtaining MgO and SnO2 composite powder after standing, ageing, spiral steaming, dryness, grinding and roasting, adding the powder material into a titanium salt and tartaric acid aqueous solution, after dryness and grinding, performing vacuum drying below 240 DEG C, and obtaining the humidity sensitive material consisting of MgO, SnO2 and TiO2. A particle size scope is 40-95nm, and the mass percentages of MgO, SnO2 and TiO2 are 15-25%, 35-45% and 40-50%. The humidity sensitive material has the characteristics of high sensitivity, rapid response, good stability and the like.

Description

technical field [0001] The present invention relates to a kind of humidity sensitive material and preparation method thereof, especially by MgO, SnO 2 and TiO 2 Composed of nanocomposite oxide humidity sensitive materials. It belongs to the field of sensor technology. Background technique [0002] Humidity is a physical quantity that indicates the degree of dryness of the atmosphere. At a certain temperature, the less water vapor there is in a given volume of air, the drier the air; the more water vapor, the wetter the air. The degree of air dryness and humidity is called humidity, which is usually expressed by physical quantities such as absolute humidity, relative humidity, comparative humidity, mixing ratio, saturation difference, and dew point. The monitoring of humidity is very important to many production processes. The production and storage of products such as fiber, paper, photosensitive film, optical glass, hot-pressed parts, electronic components, precision m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04G01N27/07
Inventor 周考文谷春秀马栋萍曹辉
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV