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Polymer grafted carbon black composite resistance type thin film humidity sensor and its production method

A technology of grafting carbon black and composite resistance, applied in the direction of material resistance, can solve the problems of easy dissolution and loss of polymer sensitive materials, poor stability, poor response, etc., to reduce agglomeration phenomenon, wide resistance change range, The effect of increased spacing

Inactive Publication Date: 2007-11-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also problems such as high-molecular sensitive materials are easily dissolved and lost in a high-humidity environment, resulting in poor response and poor stability; and in a low-humidity environment, it is difficult to measure due to too high resistance.

Method used

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  • Polymer grafted carbon black composite resistance type thin film humidity sensor and its production method
  • Polymer grafted carbon black composite resistance type thin film humidity sensor and its production method
  • Polymer grafted carbon black composite resistance type thin film humidity sensor and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Soak and clean the glass-ceramics substrate with interdigitated gold electrodes on the surface photoetched and evaporated with absolute ethanol and acetone, and dry for later use;

[0030] 2) In the presence of 4-hydroxyl-2,2,6,6-tetramethylpyridine nitroxide free radicals, benzoyl peroxide initiator is used to initiate bulk polymerization of 4-vinylpyridine, under argon atmosphere at 125 After reacting at ℃ for 15 hours, the obtained product was precipitated, washed by filtration, and dried in vacuum to obtain a polymer terminated by nitroxide radicals;

[0031] 3) Dissolve the nitroxide-terminated polymer in N,N-dimethylformamide, add carbon black, the mass ratio of carbon black to polymer is 1:6, and react at 125°C for 2h under an argon atmosphere , and then precipitated with ether, filtered, washed and vacuum-dried to obtain a poly-4-vinylpyridine-grafted carbon black composite.

[0032] 4) The poly 4-vinylpyridine grafted carbon black composite and 1,4-dibromob...

Embodiment 2

[0035] 1) Electrode cleaning is the same as in Example 1

[0036] 2) In the presence of 4-hydroxyl-2,2,6,6-tetramethylpyridine nitroxide free radicals, benzoyl peroxide initiator is used to initiate bulk polymerization of 4-vinylpyridine, under argon atmosphere for 90 After reacting at ℃ for 40 hours, the obtained product was precipitated, filtered and washed, and vacuum-dried to obtain a nitrogen-oxygen radical-terminated polymer;

[0037] 3) Dissolve the polymer terminated by nitrogen and oxygen radicals in N,N-dimethylformamide, add carbon black, the mass ratio of carbon black to polymer is 1:24, and react at 90°C under an argon atmosphere 15h, and then precipitated with ether, filtered, washed and dried in vacuum to obtain poly-4-vinylpyridine-grafted carbon black composite.

[0038] 4) The poly 4-vinylpyridine grafted carbon black composite and 1,4-dibromobutane are dispersed in N,N-dimethylformamide by ultrasonic vibration, and the poly 4-vinylpyridine grafted carbon bl...

Embodiment 3

[0041] 1) Electrode cleaning is the same as in Example 1

[0042]2) In the presence of 4-hydroxyl-2,2,6,6-tetramethylpyridine nitroxide free radicals, benzoyl peroxide initiator is used to initiate bulk polymerization of 4-vinylpyridine, under argon atmosphere at 125 After reacting at ℃ for 29 hours, the obtained product was precipitated, washed by filtration, and dried in vacuum to obtain a polymer terminated by nitroxide radicals;

[0043] 3) Dissolve the obtained nitroxide-terminated polymer in N,N-dimethylformamide, add carbon black, the mass ratio of carbon black to polymer is 1:9, and react at 125°C under an argon atmosphere 12h, and then precipitated with ether, filtered, washed and dried in vacuum to obtain poly-4-vinylpyridine-grafted carbon black composite.

[0044] 4) The poly 4-vinylpyridine grafted carbon black composite and 1,4-dibromobutane are dispersed in N,N-dimethylformamide by ultrasonic vibration, and the poly 4-vinylpyridine grafted carbon black composit...

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Abstract

The invention discloses a resistance film humidity sensor with the combination of polymer and graft carbon black and the fabricating method. Glass ceramic is used as the substrate and on it there are multiple pairs of interdigital golden electrodes. Combination humidity film obtained by graft carbon black of poly 4-vinypyridine with cross-linking quaternary amination is coated on surfaces of glass ceramic and interdigital golden electrodes. The invention is provided with simple preparing process and low cost. It is suitable for mass production. Prepared humidity sensor is provided with high sensitivity, good linearity, good water resistance, measuring in room temperature so on in the humidity range of 0-98%RH, especially in circumstance with middle-low humidity (less than 30%RH). It can be applied in production process of industry and agriculture, storage and accurate measurement and control for circumstance humidity, especially the circumstance humidity with low than 30%RH, when air circumstance is monitored.

Description

technical field [0001] The invention relates to a polymer-grafted carbon black composite resistive film humidity-sensitive element and a manufacturing method thereof. Background technique [0002] Humidity measurement and control play a very important role in environmental monitoring and protection, weather forecasting, industrial and agricultural production, material storage, and optimization of home living environment. The humidity sensor is the most commonly used and effective tool for detecting humidity, and its research and application are of great significance. Compared with the traditional ceramic material humidity sensor, the polymer material humidity sensor has the characteristics of good response characteristics, wide measurement range, good stability, room temperature detection, easy integration, miniaturized mass production, and low price. It has become a humidity sensor at present. An important direction of sensor research and development. Among them, the poly...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 李扬洪利杰杨慕杰
Owner ZHEJIANG UNIV
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