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Acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and preparation method thereof

A technology of composite nanofibers and conductive polymers, applied in the direction of transmitting sensing components using wave/particle radiation devices, processes for producing decorative surface effects, manufacturing microstructure devices, etc., can solve the problem of not being able to control sensitive films well Problems such as the uniform distribution of the film thickness sensitive film, to achieve good universality, improve contact, and speed up the response

Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of film formation is generally to use dilute solution to directly drop the film to prepare the sensitive film, but the disadvantage of this method is that the film thickness of the sensitive film and the uniform distribution of the sensitive film cannot be well controlled.

Method used

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  • Acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and preparation method thereof
  • Acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and preparation method thereof
  • Acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Prepare the N,N-dimethylformamide solution of polyaniline and polyvinyl butyral doped with polystyrene sulfonic acid, in which the concentration of polyaniline is 10 mg / mL, and the concentration of polyvinyl butyral The molar ratio of styrenesulfonic acid to aniline in polystyrenesulfonic acid-doped polyaniline is 1: 1. ;

[0039] 2) Put the solution prepared in step 1) into a syringe with a needle. The injection needle is connected to the anode of the high-voltage power supply, and the cathode of the high-voltage power supply is connected to the copper plate. Surface wave device, a 5 kV power supply voltage was applied between the needle of the syringe and the copper plate, the distance between the needle and the copper plate was 5 cm, the solution in the syringe was extruded at a flow rate of 0.5 mL / h by a syringe pump, under the action of a high-voltage electric field The moisture-sensitive nanofibers were deposited on the surface of the surface acoustic wave dev...

Embodiment 2

[0042] 1) Prepare the N,N-dimethylformamide solution of polyaniline and polyvinyl butyral doped with polystyrene sulfonic acid, in which the concentration of polyaniline is 20 mg / mL, and the concentration of polyvinyl butyral The molar ratio of styrenesulfonic acid to aniline in polystyrenesulfonic acid-doped polyaniline was 5: 1. ;

[0043] 2) Put the solution prepared in step 1) into a syringe with a needle. The injection needle is connected to the anode of the high-voltage power supply, and the cathode of the high-voltage power supply is connected to the copper plate. Surface wave device, a 10 kV power supply voltage was applied between the needle of the syringe and the copper plate, the distance between the needle and the copper plate was 8 cm, the solution in the syringe was extruded at a flow rate of 0.3 mL / h by a syringe pump, under the action of a high-voltage electric field Depositing the moisture-sensitive nanofibers on the surface of the surface acoustic wave devic...

Embodiment 3

[0048] 1) Prepare the N,N-dimethylformamide solution of polyaniline and polyvinyl butyral doped with polystyrene sulfonic acid, wherein the concentration of polyaniline is 30 mg / mL, and the concentration of polyvinyl butyral The molar ratio of styrenesulfonic acid to aniline in polystyrenesulfonic acid-doped polyaniline was 6: 1. ;

[0049] 2) Put the solution prepared in step 1) into a syringe with a needle. The injection needle is connected to the anode of the high-voltage power supply, and the cathode of the high-voltage power supply is connected to the copper plate. Surface wave device, a power supply voltage of 15 kV is applied between the needle of the syringe and the copper plate, the distance between the needle and the copper plate is 15 cm, the solution in the syringe is extruded at a flow rate of 1.0 mL / h by a syringe pump, under the action of a high-voltage electric field The moisture-sensitive nanofibers were deposited on the surface of the surface acoustic wave d...

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Abstract

The invention discloses an acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and a preparation method thereof. The acoustic surface wave type humidity sensor is prepared by depositing polyaniline and polyvinyl butyral composite nano-fibre on an acoustic surface wave device by adopting an electrostatic spinning method. The acoustic surface wave type humidity sensor has good response linearity and rapid response in a wide humidity range and also has high response sensitivity of being up to 75 kHz / %RH. For low-humidity detection, the acoustic surface wave type humidity sensor also has higher sensitivity and response linearity and is capable of detecting 0.5%RH extra-low humidity. The preparation method disclosed by the invention is simple, convenient and easy to do; the prepared acoustic surface wave type sensor can be widely applied to detecting and controlling environmental humidity in industrial and agricultural production, storage, weathers and daily lives; and signal wireless and remote transmission can be conveniently realized.

Description

technical field [0001] The invention relates to a conductive polymer composite nanofiber surface acoustic wave humidity sensor and a manufacturing method thereof. Background technique [0002] The research and application of chemical sensors is an important field in the development of science and technology in today's society. It plays a very important role in the detection and regulation of modern industrial and agricultural production and people's living environment. Humidity sensor, as a kind of important chemical sensor, has also received more and more attention and attention, and its development is very rapid at present. Among many humidity materials, research on polymer sensitive materials is very active, and a variety of polymer humidity sensors have been commercialized. However, it also has disadvantages such as low response sensitivity, slow response time, large hysteresis, and poor response reproducibility, which hinder its research and wide application. [0003]...

Claims

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Application Information

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IPC IPC(8): G01D5/48B81C1/00
Inventor 李扬杨慕杰林乾乾
Owner ZHEJIANG UNIV
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