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Preparation method of sensitive element of humidity sensor

A humidity sensor and sensitive element technology, applied in instruments, scientific instruments, material analysis using radiation diffraction, etc., to achieve the effect of improving performance, facilitating promotion, and low cost

Active Publication Date: 2022-07-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
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Effect test

Embodiment 1

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

[0035] (1) Take cobalt nitrate hexahydrate, 4,4'-bipyridine and polyvinylpyrrolidone as raw materials, measure these three raw materials in 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 7-8 ml of absolute ethanol is added to each 1 mg of cobalt nitrate hexahydrate to mix The solution was stirred for 10-20 minutes to obtain mixed solution A; wherein the average molecular weight of polyvinylpyrrolidone was 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 molar ratio of meso-tetrakis (4-carboxyphenyl) porphine and absolute ethan...

Embodiment 2

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

[0042](1) Take cobalt nitrate hexahydrate, 4,4'-bipyridine and polyvinylpyrrolidone as raw materials, measure these three raw materials in a molar ratio of 1:0.37:2.70, and dissolve them in N,N-dimethyl after mixing. In the mixed solution of formamide and absolute ethanol, the volume ratio of N,N-dimethylformamide and absolute ethanol is 3:1, and 7.5 ml of the mixed solution of absolute ethanol is added to each 1 mg 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 is 3:1, wherein the mol ratio of meso-tetra(4-carboxyphenyl) porphine and absolute ethanol is 1:3...

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Abstract

The invention provides a preparation method of a sensitive element of a humidity sensor with high sensitivity humidity response characteristics. Using cobalt nitrate hexahydrate, 4,4'-bipyridine, polyvinylpyrrolidone, meso-tetrakis (4-carboxyphenyl) porphine as main raw materials, firstly obtain cobalt-based metal organic framework Co-MOF through synthesis reaction; Co-MOF and phytic acid are further reacted to obtain a phytic acid-modified Co-MOF material; the material is mixed with deionized water and ground into a paste-like slurry, which is uniformly coated on the surface of the substrate, and the sensitive material film is obtained after drying. Phytic acid-modified Co-MOF humidity sensor sensing element. In the present invention, the phytic acid and the Co-MOF material are complementary, and the phytic acid can corrode the free protons of the MOF skeleton and effectively regulate the performance of the sensitive material. The sensitive element of the humidity sensor of the present invention has fast response time, wide range of relative humidity detected, and good stability.

Description

technical field [0001] The invention belongs to the technical field of humidity sensors, and in particular relates to a preparation method of a sensitive element of a humidity sensor. Background technique [0002] Humidity is a physical quantity closely related to life. It needs to be accurately monitored. 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 composed of metal ions and organic ligands...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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