Impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and preparation method thereof

A technology of silicon dioxide and humidity sensitive components, applied in material resistance, instruments, analytical materials, etc., can solve the problem of difficult to ensure the uniform distribution of humidity active substances, and achieve the effect of good humidity sensitive characteristics and good stability

Inactive Publication Date: 2017-06-27
JILIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This type of composite moisture-sensitive material needs to be prepared by physical blending. The disadvantage is that there are no strong chemical bonds such as ionic bonds or covalent bonds between silica and humidity active substances, and it is difficult to ensure the uniform distribution of humidity active substances in silica.

Method used

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  • Impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and preparation method thereof
  • Impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and preparation method thereof
  • Impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] (1) Preparation of vinyl-modified silica particles

[0031] Weigh 1.20 g of vinyltriethoxysilane and mix it with 100 ml of deionized water in a 250 ml Erlenmeyer flask. Stir at room temperature until the oily matter completely disappears, place the Erlenmeyer flask in a 70-degree oil bath, add 6.7 milliliters of ammonia water (mass fraction 20%) dropwise to the Erlenmeyer flask under stirring to adjust the pH value of the solution to 9.0, and stir to react After 4 hours, the product was collected by ethanol centrifugation, and vacuum-dried at 40°C for 12 hours to obtain vinyl-modified silica particles; the product mass was 316.0 mg.

[0032] (2) Preparation of Silica Particles Modified by Hydrophilic Polymer

[0033] Material 1 (the molar ratio of ethylenic bonds in silica particles to monomers is 1:0.05):

[0034] Weigh 100.0 mg of vinyl-modified silica nanoparticles, add 21.6 mg of methacryloyloxyethyltrimethylammonium chloride aqueous solution (mass fraction 80%) a...

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Abstract

The invention discloses an impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and a preparation method of the impedance type humidity sensitive element, and belongs to the technical field of humidity sensitivity material and humidity sensitivity element preparation. On olefinic bond modified silicon dioxide particles, a polar polymer is modified on the silicon dioxide particles by using a free radical polymerization reaction, the silicon dioxide particles are used as skeletons, polymer chains are used for providing hydrophily, and meanwhile the polymer modified silicon dioxide particles can be stably dispersed in a solvent, so that the humidity sensitive element can be prepared by using a solution processing method. According to preparation method of the impedance type humidity sensitive element based on the polymer modified silicon dioxide particles, a humidity sensitive membrane is prepared by processing a substrate surface solution printed with an interdigital electrode, and detection for environmental relative humidity is realized by detecting the impedance of the humidity sensitive element along with the change of humidity. The method is simple and reliable, and low-cost and high-stable batch preparation of the humidity sensitive elements is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of preparation of humidity-sensitive materials and humidity-sensitive elements, and in particular relates to an impedance-type humidity-sensitive element based on solution-processable polymer-modified silicon dioxide particles and a preparation method thereof. Background technique [0002] The detection and control of humidity has a broad demand in many fields such as industrial and agricultural production, weather forecasting, smart home, and cultural relics protection. [0003] The humidity sensor can quantitatively monitor the ambient humidity. According to different detection techniques, it can be divided into surface acoustic wave type, mass type, capacitive type, impedance type, etc. Among them, the impedance type humidity sensor has the advantages of simple structure and convenient signal processing, and is a type of humidity sensor with the most application potential. The working principle of the i...

Claims

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Application Information

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IPC IPC(8): G01N27/12C08F120/34C08F2/44
CPCC08F2/44C08F120/34G01N27/121G01N27/126G01N27/127
Inventor 费腾张彤赵红然刘森
Owner JILIN UNIV
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