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Polyelectrolyte and graphene composite resistive moisture sensor and manufacturing method thereof

A graphene composite and polyelectrolyte technology, which is applied in the direction of material resistance, can solve problems such as limited application, high resistance, and difficulty in measurement, and achieve good linear response, high conductivity, and reduced resistance.

Inactive Publication Date: 2012-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the polymer resistive humidity sensor is mainly based on polyelectrolyte, which has a relatively high response sensitivity, but at the same time, this kind of material has a high resistance in a low-humidity environment, which is difficult to measure, which greatly limits its application in low-humidity detection.

Method used

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  • Polyelectrolyte and graphene composite resistive moisture sensor and manufacturing method thereof
  • Polyelectrolyte and graphene composite resistive moisture sensor and manufacturing method thereof
  • Polyelectrolyte and graphene composite resistive moisture sensor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0025] 2) Dilute 5 g of 25%wt PDDA solution with 5 ml of deionized water;

[0026] 3) Add 5 mg of graphene oxide to 5 ml of water, ultrasonically oscillate for 15 minutes, then add dropwise to the PDDA solution prepared in step 2), continue ultrasonically oscillating for 15 minutes, then add 0.1 ml of 85% Hydrazine hydrate, heated at 65°C for 5 hours to obtain a precursor solution;

[0027] 4) Immerse the ceramic interdigitated gold electrode in step 1) in the precursor solution prepared in step 3) for 0.5 minutes, pull it out, and heat it at 60°C for 1 hour to obtain a composite moisture-sensitive electrode covered with polyelectrolyte and graphene. Thin film resistive humidity sensor.

Embodiment 2

[0029] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0030] 2) Dilute 3 g of 25%wt PDDA solution with 7 ml of deionized water;

[0031] 3) Add 7 mg of graphene oxide to 7 ml of water, ultrasonically oscillate for 20 minutes, then add dropwise to the PDDA solution prepared in step 2), continue ultrasonically oscillating for 20 minutes, then add 0.2 ml of 85% Hydrazine hydrate, heated at 125°C for 7 hours to obtain a precursor solution;

[0032] 4) Immerse the ceramic interdigitated gold electrode in step 1) in the precursor solution prepared in step 3) for 0.8 minutes, pull it out, and heat it at 70°C for 2 hours to obtain a composite moisture-sensitive electrode covered with polyelectrolyte and graphene. Thin film resistive humidity sensor.

Embodiment 3

[0034] 1) Clean the surface photolithography and evaporate the ceramic substrate with interdigitated gold electrodes, and dry it for later use;

[0035] 2) Dilute 1 g of 25%wt PDDA solution with 10 ml of deionized water;

[0036] 3) Add 15 mg of graphene oxide to 10 ml of water, ultrasonically oscillate for 30 minutes, then add dropwise to the PDDA solution prepared in step 2), continue ultrasonically oscillating for 30 minutes, then add 0.4 ml of 85% Hydrazine hydrate, heated at 80°C for 10 hours to obtain a precursor solution;

[0037] 4) Immerse the ceramic interdigitated gold electrode in step 1) in the precursor solution prepared in step 3) for 1.5 minutes, pull it out, and heat it at 90°C for 5 hours to obtain a composite moisture-sensitive electrode covered with polyelectrolyte and graphene. Thin film resistive humidity sensor.

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Abstract

The invention discloses a polyelectrolyte and graphene composite resistive moisture sensor and a manufacturing method thereof. The polyelectrolyte and graphene composite resistive moisture sensor uses a ceramic as a substrate on which a plurality of pairs of interdigital gold electrodes are arranged; a moisture sensitive film is coated on the ceramic substrate and the interdigital gold electrode surfaces, the moisture sensitive film is a polyelectrolyte poly (diallyldimethylammonium chloride) and graphene composite. The moisture sensor has the advantages of moderate impedance value, high sensitivity, good linearity, small dampness and can be detected at room temperature in a wide humidity range, in particular in a low humidity environment, can be widely applied to the accurate measurement and control of the environmental humidity in the fields of industrial and agricultural production, storage, atmospheric environment monitoring and the like, in particular the humidity in a low humidity environment.

Description

technical field [0001] The invention relates to a polyelectrolyte and graphene composite resistive humidity sensor and a manufacturing method thereof. Background technique [0002] Humidity detection plays an increasingly important role in modern industrial and agricultural production and environmental monitoring. As the most commonly used and effective method for detecting humidity, the research of humidity sensor has been paid more and more attention by various countries. In recent years, high-voltage electrical equipment has been more and more used in all aspects of production and life, and the moisture content in sulfur hexafluoride gas, the medium used for insulation of high-voltage substation equipment, has a significant impact on its insulation performance, and affects the life of equipment and Safety, so the monitoring of low humidity environment has also received great attention. The polymer resistive humidity sensor has the advantages of high response sensitivity...

Claims

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Application Information

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IPC IPC(8): G01N27/04
Inventor 李扬邓超杨慕杰
Owner ZHEJIANG UNIV
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