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Cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element and manufacturing method thereof

A technology of composite polymer and humidity sensor, which is applied in the field of cationic polyelectrolyte and polypyrrole composite polymer resistance type humidity sensor, and can solve the problems of narrowing the detection range of the humidity sensor, reducing the conductivity of composite materials, adverse effects of application, etc. , to achieve the effect of reducing wet hysteresis, speeding up the response time, and weakening the interaction

Inactive Publication Date: 2014-05-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, due to the introduction of hydrophobic materials, the electrical conductivity of the composite material is reduced, especially in the low humidity environment, the impedance is large, and it is difficult to measure
This will lead to a narrow detection range of the humidity sensor, which will also adversely affect its application.

Method used

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  • Cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element and manufacturing method thereof
  • Cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element and manufacturing method thereof
  • Cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0027] The interdigitated gold electrodes on the surface of the ceramic substrate have an interdigital width of 100 μm and an interdigital gap of 100 μm.

[0028] 2) Add 3.5 g of 1-vinyl-3-ethylimidazole bromide and 0.035 g of azobisisobutyronitrile into 20 ml of chloroform, stir at room temperature for one hour, heat up to 90°C for 3 hours, and cool the product to At room temperature, discard the solvent, dissolve with an appropriate amount of methanol, then precipitate in a large amount of acetone, filter with suction, and dry in a vacuum oven until constant weight to obtain a white solid, which is polybrominated 1-vinyl-3-ethylimidazole ;

[0029] 3) Add 0.35 g of the polybrominated 1-vinyl-3-ethylimidazole and 0.5 g of pyrrole monomers prepared in step 2) into 30 mL of deionized water in turn, stir well, Add 40 milliliters of 0...

Embodiment 2

[0036] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0037] The interdigitated gold electrodes on the surface of the ceramic substrate have an interdigital width of 20 μm and an interdigital gap of 20 μm.

[0038] 2) Add 1.0 g of 1-vinyl-3-ethylimidazole bromide and 0.03 g of azobisisobutyronitrile into 50 ml of chloroform, stir at room temperature for one hour, raise the temperature to 100°C for 5 hours, and cool the product to At room temperature, discard the solvent, dissolve with an appropriate amount of methanol, then precipitate in a large amount of acetone, filter with suction, and dry in a vacuum oven until constant weight to obtain a white solid, which is polybrominated 1-vinyl-3-ethylimidazole ;

[0039] 3) Add 0.1 g of polybrominated 1-vinyl-3-ethylimidazole and 0.5 g of pyrrole monomers prepared in step 2) into 50 mL of deionized water in turn, stir evenly, and under ultraso...

Embodiment 3

[0043] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0044] The interdigitated gold electrodes on the surface of the ceramic substrate have an interdigital width of 40 μm and an interdigital gap of 40 μm.

[0045] 2) Add 2.0 g of 1-vinyl-3-ethylimidazole bromide and 0.03 g of azobisisobutyronitrile into 20 ml of chloroform, stir at room temperature for one hour, raise the temperature to 60°C for 2 hours, and cool the product to At room temperature, discard the solvent, dissolve with an appropriate amount of methanol, then precipitate in a large amount of acetone, filter with suction, and dry in a vacuum oven until constant weight to obtain a white solid, which is polybrominated 1-vinyl-3-ethylimidazole ;

[0046] 3) Add 0.3 g of the polybrominated 1-vinyl-3-ethylimidazole and 0.5 g of pyrrole monomers prepared in step 2) into 20 mL of deionized water in turn, stir well, and within 15 ...

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Abstract

The invention discloses a cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element and a manufacturing method thereof. The cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element is characterized in that a ceramic matrix is utilized and multiple pairs of interdigital Au electrodes are arranged on the ceramic matrix; humidity-sensitive films are coated on surfaces of the interdigital Au electrodes and the ceramic matrix; and the humidity-sensitive film is a composite of cross-linked quaternized polytetravinylpyridine and poly(ionic liquid)-doped dispersible polypyrrole. In a wide humidity range and especially in a low-humidity environment, the cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element has an appropriate resistance value, high sensitivity, good linearity, a fast response speed, small hysteresis, good reversibility, strong stability and detectability at a room temperature. Therefore, the cationic polyelectrolyte-polypyrrole composite polymer resistive-type humidity-sensitive element can be widely used for environment humidity accurate measurement and control in fields of industrial and agricultural production, storage and atmospheric environment monitoring.

Description

technical field [0001] The invention relates to a cationic polyelectrolyte and polypyrrole compound polymer resistance type humidity sensitive element and a manufacturing method thereof. Background technique [0002] Humidity detection and control play an increasingly important role in industrial production, modern digital agriculture, warehousing, atmospheric environment monitoring and other fields. The market also promotes the research of humidity sensors. The current humidity sensor can be divided into resistive type, capacitive type, surface acoustic wave type, optical fiber type, quartz vibrator type, etc. according to its detection principle, and the core of the humidity sensor, that is, the sensitive material, mainly includes inorganic semiconductor ceramics and organic polymers. Among many humidity sensors, the polymer resistive type has become the focus of research and development of humidity sensors due to its advantages of high response sensitivity, simple prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 李扬邓超杨慕杰
Owner ZHEJIANG UNIV
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