Method for preparing humidity-sensitive film

A moisture-sensitive, thin-film technology, applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems of performance impact and large volume, and achieve the effects of controllable thickness, low preparation cost and simple preparation

Inactive Publication Date: 2013-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sintered sensors have been studied the most, their volume is relatively large, and their performance is affected by factors such as calcination conditions, crystal structure, and impurities.

Method used

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  • Method for preparing humidity-sensitive film
  • Method for preparing humidity-sensitive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Take analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and can completely dissolve cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Analytical absolute ethanol (C 2 h 5 OH), analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) dissolved in analytical grade absolute ethanol (C 2 h 5 OH), and then slowly add analytically pure butyl phthalate (Ti(OC 4 h 9 ) 4 ), formulated as Co 2+ : Ti 4+ = 1:0.5 molar ratio of the mixed solution, fully stirred at room temperature to obtain a uniform red transparent solution A;

[0022] 2) Slowly add aqueous citric acid solution dropwise to solution A, adjust the pH value of the solution to 1.0, and obtain purple-red sol B;

[0023] 3) Let Sol B stand at 20°C for 48 hours to obtain Gel C;

[0024] 4) Put the substrate to be coated into the mixed solution of acetone and ethanol with a volume ratio of 1:3 for ultrasonic cleaning, the ultrasonic power is 50W, rinse the cleaned substrate with...

Embodiment 2

[0028] 1) Take analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and can completely dissolve cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Analytical absolute ethanol (C 2 h 5 OH), analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) dissolved in analytical grade absolute ethanol (C 2 h 5 OH), and then slowly add analytically pure butyl phthalate (Ti(OC 4 h 9 ) 4 ), formulated as Co 2+ : Ti 4+ = 1:3 molar ratio mixed solution, fully stirred at room temperature to obtain a uniform red transparent solution A;

[0029] 2) Slowly add aqueous citric acid solution dropwise to solution A, adjust the pH value of the solution to 7.0, and obtain purple-red sol B;

[0030] 3) Let Sol B stand at 60°C for 10 hours to obtain Gel C;

[0031] 4) Put the substrate to be coated into a mixed solution of acetone and ethanol with a volume ratio of 1:8 for ultrasonic cleaning, the ultrasonic power is 50W, rinse the cleaned substrate with deionized ...

Embodiment 3

[0035] 1) Take analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and can completely dissolve cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Analytical absolute ethanol (C 2 h 5 OH), analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) dissolved in analytical grade absolute ethanol (C 2 h 5 OH), and then slowly add analytically pure butyl phthalate (Ti(OC 4 h 9 ) 4 ), formulated as Co 2+ : Ti 4+ = 1:1 molar ratio mixed solution, fully stirred at room temperature to obtain a uniform red transparent solution A;

[0036] 2) Slowly add aqueous citric acid solution dropwise to solution A, adjust the pH value of the solution to 4.0, and obtain purple-red sol B;

[0037] 3) Let Sol B stand at 30°C for 25 hours to obtain Gel C;

[0038] 4) Put the substrate to be coated into a mixed solution of acetone and ethanol with a volume ratio of 1:5 for ultrasonic cleaning, the ultrasonic power is 50W, rinse the cleaned substrate with deionized wa...

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Abstract

A method for preparing a humidity-sensitive film, comprises: dissolving cobalt nitrate hexahydrate into absolute ethyl alcohol, and then adding dibutyl phthalate to obtain a solution A; dropping a citric acid solution into the solution A to obtain sol B; stewing the sol B under 20-60 DEG C to obtain gel C; immersing a substrate into the gel C, vertically pulling the substrate in a uniform speed for plating a film, and immediately drying, wherein thickness of the film is controlled by the repeat number for plating the film; annealing the film under 300-700DEG C after dried, cooling in furnace to obtain an object product-CoTiIO3 humidity sensitive film. The CoTiIO3 humidity sensitive film of the invention is tightly applied with the substrate, wherein the film is uniform and flat, and is controllable in thickness. Under room temperature, the film shows good sensitivity, and in a 10%-95% RH environment, a resistance value is most reduced in three orders of magnitude. The technology has advantages of simple preparation, convenient operation, good repeatability, easily available raw material, and low preparation cost.

Description

technical field [0001] The invention relates to a method for preparing a film, in particular to a method for preparing a humidity-sensitive film. Background technique [0002] Environmental humidity monitoring plays an indispensable role in food and drug storage, greenhouse planting, environmental monitoring, instrumentation and electrical appliances, and even in the storage of missiles and rockets for military equipment. However, humidity measurement is not easy. The traditional method obtains humidity by monitoring the physical quantity changes caused by the adsorption of water vapor by some natural substances, but this measurement method has poor accuracy, stability and anti-interference ability, and the response is slow and cannot be online. Tracking humidity changes cannot meet automation requirements. [0003] At present, humidity sensors are mainly divided into two categories: resistive type and capacitive type. From the perspective of preparation technology, they ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00C04B35/462C04B35/622
Inventor 卢靖黄剑锋曹丽云吴建鹏李翠艳费杰
Owner SHAANXI UNIV OF SCI & TECH
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