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Macromolecule-based resistance type humidity sensing element and preparation method thereof

A moisture-sensitive component and polymer-based technology, applied in the direction of material resistance, can solve the problems of resistance-type polymer humidity sensors with unsatisfactory water resistance and loss of sensitive substances, and achieve high sensitivity, good stability, and mild conditions.

Inactive Publication Date: 2015-11-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of resistive polymer humidity sensor is that the water resistance of the element is not ideal under high humidity conditions, and the loss of sensitive substances is prone to occur during long-term work

Method used

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  • Macromolecule-based resistance type humidity sensing element and preparation method thereof
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  • Macromolecule-based resistance type humidity sensing element and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of P1 polymer elements

[0026] Octapropylmercaptooctasilsesquioxane (300.0mg, 294.7μmol), divinylbenzene (115.1mg, 884.2μmol), methacryloxyethyltrimethylammonium chloride (80wt% aqueous solution, 153.0mg, 589.4 μmol), benzoin dimethyl ether (6.0 mg, 23.6 μmol) were added into the reaction flask, and tetrahydrofuran (1 mL) was added to dissolve the reactant. After the reactants are evenly mixed, the carbon interdigitated electrodes (substrate area 5mm×8mm, four pairs of electrodes, electrode width 300μm, inter-finger spacing 350μm) are immersed in the solution for about 10 seconds, then taken out, and dried in the air for two minutes With ultraviolet light (120mJ / cm 2 ) was irradiated for 30 minutes to carry out polymerization, and the thickness of the obtained cross-linked humidity sensitive film was 28 μm, thereby preparing a polymer-based resistance type humidity sensitive element.

Embodiment 2

[0028] Preparation of P2 polymer elements

[0029] Octapropylmercaptooctasilsesquioxane (300.0 mg, 294.7 μmol), divinylbenzene (105.5 mg, 810.5 μmol), methacryloxyethyltrimethylammonium chloride (80 wt % aqueous solution, 191.3 mg, 736.8 μmol), benzoin dimethyl ether (6.0 mg, 23.6 μmol) were added into the reaction flask, and tetrahydrofuran (1 mL) was added to dissolve the reactant. After the reactants are evenly mixed, the carbon interdigitated electrodes (substrate area 5mm×8mm, four pairs of electrodes, electrode width 300μm, inter-finger spacing 350μm) are immersed in the solution for about 10 seconds, then taken out, and dried in the air for two minutes With ultraviolet light (120mJ / cm 2 ) was irradiated for 30 minutes to carry out polymerization, and the thickness of the obtained cross-linked humidity sensitive film was 25 μm, thereby preparing a polymer-based resistance type humidity sensitive element.

Embodiment 3

[0031] Preparation of P3 polymer elements

[0032] Octapropylmercaptooctasilsesquioxane (300.0 mg, 294.7 μmol), divinylbenzene (124.7 mg, 957.9 μmol), methacryloyloxyethyltrimethylammonium chloride (80 wt % aqueous solution, 114.8 mg, 442.1 μmol), benzoin dimethyl ether (6.0 mg, 23.6 μmol) were added into the reaction flask, and tetrahydrofuran (1 mL) was added to dissolve the reactant. After the reactants are evenly mixed, the carbon interdigitated electrodes (substrate area 5mm×8mm, four pairs of electrodes, electrode width 300μm, inter-finger spacing 350μm) are immersed in the solution for about 10 seconds, and then put out after drying in the air for two minutes. With ultraviolet light (120mJ / cm 2 ) was irradiated for 30 minutes to carry out polymerization, and the thickness of the obtained cross-linked humidity sensitive film was 25 μm, thereby preparing a polymer-based resistance type humidity sensitive element.

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Abstract

The invention discloses a macromolecule-based resistance type humidity sensing element and a preparation method thereof, belonging to the technical field of humidity sensing elements and preparation. The macromolecule-based resistance type humidity sensing element of a humidity sensing macromolecule cross linkage film, which is based on in situ preparation, is obtained by the steps of dissolving a certain amount of poly-sulfhydryl compound, poly-alkenyl compound and alkenyl compound containing a polar group and a photocatalyst by using an organic solvent to obtain a mixture, dropwise coating and dipcoating a substrate printed with an interdigital electrode with the mixture, and triggering and clicking polymerization reaction due to the irradiation of ultraviolet light. A polymer humidity sensing film can be prepared on different substrates and electrodes, humidity sensing type polymers with stable structures can be directly prepared on the substrates, and meanwhile, the prepared humidity sensing element has good humidity sensing characteristic and stability in the whole relative humidity range. The method is simple and reliable, and the batch production of the humidity sensing elements with high performance can be realized.

Description

technical field [0001] The invention belongs to the technical field of humidity sensitive elements and preparation thereof, and in particular relates to a polymer-based resistance type humidity sensitive element and a preparation method thereof. Background technique [0002] In the earth's atmosphere, gaseous water molecules are a very important component. The precise measurement and control of humidity is crucial in many fields such as aerospace, warehousing, environmental monitoring, medical care, structural health monitoring, industrial and agricultural production, and precision instrument protection. important. [0003] Humidity sensors can convert ambient humidity into corresponding measurable electrical signals, including resistance, capacitance, and complex impedance. Among a wide variety of humidity sensors, resistive humidity sensors are widely used due to their simple structure and convenient signal processing. The humidity-sensitive materials are mainly organic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 费腾张彤代建勋江凯
Owner JILIN UNIV
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