Halloysite nanotube-based humidity sensor and preparation method thereof

A halloysite nanotube and humidity sensor technology, which is applied in the direction of material impedance, can solve the problems of high performance and low cost, and achieve good response recovery characteristics, fast response speed, and large specific surface area.

Active Publication Date: 2020-01-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the defects that the above-mentioned existing humidity sensors usually cannot balance high performance and low cost, the present invention provides a humidity sensor based on halloysite nanotubes and its preparation method

Method used

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  • Halloysite nanotube-based humidity sensor and preparation method thereof
  • Halloysite nanotube-based humidity sensor and preparation method thereof
  • Halloysite nanotube-based humidity sensor and preparation method thereof

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Embodiment 1

[0037] A humidity sensor based on halloysite nanotubes, comprising a substrate, the surface of the substrate contains interdigital electrodes, the substrate is coated with a humidity sensing layer, and the humidity sensing layer completely covers the interdigital electrodes , the humidity sensing layer is made of halloysite nanotubes and a solvent, the mass ratio of the halloysite nanotubes to the solvent is 1:1; the solvent is ethanol; the thickness of the humidity sensing layer The number of the interdigitated electrodes is 1 pair, and the interdigital distance of each pair of the interdigitated electrodes is 500 μm; the substrate is polyimide.

Embodiment 2

[0039] A humidity sensor based on halloysite nanotubes, comprising a substrate, the surface of the substrate contains interdigital electrodes, the substrate is coated with a humidity sensing layer, and the humidity sensing layer completely covers the interdigital electrodes , the humidity sensing layer is made of halloysite nanotubes and a solvent, the mass ratio of the halloysite nanotubes to the solvent is 1:3; the solvent is deionized water; the humidity sensing layer The thickness of the interdigitated electrode is 30 μm; the number of the interdigitated electrodes is 5 pairs, and the interdigital distance of each pair of the interdigitated electrodes is 150 μm; the substrate is aluminum oxide.

Embodiment 3

[0041] A humidity sensor based on halloysite nanotubes, comprising a substrate, the surface of the substrate contains interdigital electrodes, the substrate is coated with a humidity sensing layer, and the humidity sensing layer completely covers the interdigital electrodes , the humidity sensing layer is made of halloysite nanotubes and a solvent, the mass ratio of the halloysite nanotubes to the solvent is 1:10; the solvent is acetone; the thickness of the humidity sensing layer is 100 μm; the number of the interdigitated electrodes is 10 pairs, and the interdigital distance of each pair of the interdigitated electrodes is 50 μm; the substrate is paper.

[0042] In Embodiment 1-3, the substrate can also be one of silicon, polyetherimide or fabric;

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Abstract

The present invention provides a halloysite nanotube-based humidity sensor and a preparation method thereof, and belongs to the field of humidity sensitive elements and preparation technologies thereof. A halloysite nanotube-based humidity sensor comprises a substrate. A surface of the substrate is provided with an interdigital electrode. A humidity sensing layer is coated on the substrate. The humidity sensing layer completely covers the interdigital electrode, and the humidity sensing layer is a halloysite nanotube. The halloysite nanotube-based humidity sensor in this application has a large humidity response with five orders of magnitude of impedance change; has a wide detection range, and can detect relative humidity in a range of 0%-91.5%; has a fast response time, which does not exceed one second; and has advantages of being rich in raw materials resources, low in costs, green and environmentally friendly and simple in device fabrication process, and has good practical application value.

Description

technical field [0001] The invention relates to the technical field of humidity sensitive elements and their preparation, in particular to a halloysite nanotube-based humidity sensor and a preparation method thereof. Background technique [0002] The development of humidity measurement technology has a history of more than 200 years. People's understanding of the humidity sensor began in 1938 when F.W.Dummore in the United States successfully developed the dip-coated LiCl humidity sensor. Since then, there have been dozens of humidity sensors and sensors. Came into being. [0003] Relative humidity is an important environmental parameter in household, industrial, agricultural and medical places. It is necessary to develop high-performance and low-cost humidity sensors to monitor it accurately. [0004] The humidity sensor refers to a device-type device that can convert humidity into an electrical output that is proportional to it. The main characteristic parameters are hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02
CPCG01N27/02
Inventor 太惠玲段再华蒋亚东赵秋妮黄琦谢光忠杜晓松
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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