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Preparation method of sensitive element of humidity sensor

A humidity sensor and sensitive element technology, which is applied in the direction of instruments, scientific instruments, and material analysis using radiation diffraction, etc., to achieve good effect, uniform appearance, and simple operation

Active Publication Date: 2021-08-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using MOFs as templates to add hydrophilic groups to improve the humidity-sensing performance has not been reported yet.

Method used

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  • Preparation method of sensitive element of humidity sensor
  • Preparation method of sensitive element of humidity sensor
  • Preparation method of sensitive element of humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 A method for preparing a sensitive element of a humidity sensor, comprising the steps of:

[0035] (1) Take cobalt nitrate hexahydrate, 4,4'-bipyridyl and polyvinylpyrrolidone as raw materials, measure these three raw materials with a molar ratio of 1:0.35-0.40:2.50-3, mix them and dissolve them in N, N - In the mixed solution of dimethylformamide and absolute ethanol, the volume ratio of N,N-dimethylformamide and absolute ethanol is 3:1, and 7-8ml of absolute ethanol is added for every 1mg of cobalt nitrate hexahydrate and mixed solution, stirred for 10-20 minutes to obtain mixed solution A; wherein the average molecular weight of polyvinylpyrrolidone is 1,300,000;

[0036] (2) Dissolve meso-tetrakis(4-carboxyphenyl)porphine in a mixed solution of N,N-dimethylformamide and absolute ethanol, N,N-dimethylformamide and absolute ethanol The volume ratio is 3:1, wherein the mol ratio of meso-tetrakis(4-carboxyphenyl)porphin to absolute ethanol is 1:2.5-4, stir...

Embodiment 2

[0041] Embodiment 2 A method for preparing a sensitive element of a humidity sensor, comprising the steps of:

[0042](1) Take cobalt nitrate hexahydrate, 4,4'-bipyridyl and polyvinylpyrrolidone as raw materials, measure these three raw materials at a molar ratio of 1:0.37:2.70, mix them and dissolve them in N,N-dimethyl In the mixed solution of formamide and absolute ethanol, the volume ratio of N,N-dimethylformamide and absolute ethanol is 3:1, wherein 7.5ml of absolute ethanol mixed solution is added to every 1mg of cobalt nitrate hexahydrate, and stirred for 15 minutes , to obtain mixed solution A; wherein the average molecular weight of polyvinylpyrrolidone is 1,300,000;

[0043] (2) Dissolve meso-tetrakis(4-carboxyphenyl)porphine in a mixed solution of N,N-dimethylformamide and absolute ethanol, N,N-dimethylformamide and absolute ethanol The volume ratio of the mixture is 3:1, and the molar ratio of meso-tetrakis(4-carboxyphenyl)porphin to absolute ethanol is 1:3, and s...

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Abstract

The invention provides a preparation method of a sensitive element of a humidity sensor with a high-sensitivity humidity response characteristic. The preparation method comprises the following steps: by taking cobalt nitrate hexahydrate, 4, 4 '-dipyridyl, polyvinylpyrrolidone and meso-tetra (4-carboxyl phenyl) porphin as main raw materials, a cobalt-based metal organic framework Co-MOF is firstly obtained through a synthetic reaction; the Co-MOF and phytic acid are further subjected to a reaction, and a phytic acid modified Co-MOF material is obtained; the material and deionized water are mixed and ground into pasty slurry, the surface of a substrate and a sensitive material film are uniformly coated with the pasty slurry, and the phytic acid modified Co-MOF humidity sensor sensitive element is prepared after drying. The phytic acid and the Co-MOF material are complementary, the phytic acid can corrode free protons of an MOF framework, and the performance of the sensitive material is effectively regulated and controlled. The sensitive element of the humidity sensor is short in response time, wide in detected relative humidity range and good in stability.

Description

technical field [0001] The invention belongs to the technical field of humidity sensors, and in particular relates to a method for preparing a sensitive element of the humidity sensor. Background technique [0002] Humidity is a physical quantity closely related to life, which requires accurate monitoring of humidity. Humidity sensors play an important role in environmental monitoring, human physiological activities, precision instrument protection, food safety and other fields. The development of high-performance humidity sensors with high sensitivity, fast response and low cost has become a research hotspot in the field of scientific research and industry. Among them, sensitive materials are the core of humidity sensors, and the key to improving the performance of humidity sensors is to develop humidity-sensitive materials with excellent response characteristics. [0003] Metal-organic frameworks (MOFs) are organic-inorganic hybrid materials, which are composed of metal i...

Claims

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Application Information

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IPC IPC(8): G01N23/2273G01N23/02G01N23/20
CPCG01N23/2273G01N23/02G01N23/20G01N2223/03G01N2223/085G01N2223/613
Inventor 王子莹胡宁霍燕明
Owner HEBEI UNIV OF TECH
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