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Applicable ion type flexible humidity sensor and preparation method and application thereof

A humidity sensor, ion-type technology, applied in the field of sensors, can solve the problems of unsatisfactory stability and reliability, and achieve the effect of simple and controllable preparation process and cheap and easy-to-obtain raw materials

Active Publication Date: 2017-09-19
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability and reliability of moisture-sensitive elements including ionic polymers are not ideal at present, especially the moisture content of the moisture-sensitive film itself is a key factor affecting the detection limit and long-term stability of the device. These problems For many years, the practical application and further development of humidity sensors have been restricted and hindered. Therefore, to explore new high-precision, high-reliability, and long-life excellent modified polymer humidity-sensitive materials, to improve the structure of components and their preparation processes, to improve and enhance Sensor response characteristics, stability and reliability have become the core topics of research in this field

Method used

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  • Applicable ion type flexible humidity sensor and preparation method and application thereof
  • Applicable ion type flexible humidity sensor and preparation method and application thereof
  • Applicable ion type flexible humidity sensor and preparation method and application thereof

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preparation example Construction

[0056] In some preferred embodiments, the preparation method further includes: coating a biocompatible material at least on the first surface of the flexible substrate and a partial surface of the electrode to form a flexible protective layer, and making the The flexible protective layer, electrodes, sensitive layer and flexible substrate form an integrated structure.

[0057] Further, the polymer includes polyvinyl alcohol, but is not limited thereto.

[0058] Further, the inorganic salt includes any one or a combination of two or more of sodium sulfate, sodium hydroxide, sodium bicarbonate, potassium sulfate, potassium hydroxide, and potassium bicarbonate, but is not limited thereto.

[0059] Further, the modified filler includes any one or a combination of two or more of montmorillonite, kaolin, polypropylene, sodium polyacrylate, and polyacrylamide, but is not limited thereto.

[0060] In some embodiments, the preparation method may further include: mixing inorganic salts...

Embodiment 1

[0083] Example 1: Weigh 6g of PVA and 3g of potassium hydroxide into a flask filled with 60mL of deionized water, stir at 85°C until completely dissolved, then add 0.5g of polypropylene and polyacrylamide mixture to continue To mix evenly, obtain modified PVA gel electrolyte solution (see figure 2 transparent solution in ), the sensitive layer is obtained after removing moisture by drying, natural drying, etc., see figure 2 As shown, the results show that there are a large number of porous structures inside the film (see image 3 shown), which is beneficial to the adsorption of water molecules and the rapid movement of ions in the electrolyte, which can improve the response rate and response range of the sensitive layer. On this basis, by drawing two electrodes on the surface of the sensitive layer, and coating the electrode layer and the surface of the sensitive layer with a material with good biocompatibility (such as silica gel), after forming a protective layer, the var...

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Abstract

The invention discloses an applicable ion type flexible humidity sensor and a preparation method and application thereof. The sensor comprises a flexible substrate, a sensitive layer and at least two electrodes, wherein the flexible substrate is provided with a first surface and a second surface which are opposite; the sensitive layer is arranged on the first surface of the flexible substrate; the at least two electrodes are arranged at an interval and are electrically combined with the sensitive layer; the sensitive layer comprises an ion type modified polymer electrolyte sensitive film which is provided with a three-dimensional porous structure in even distribution. The sensor has the characteristics of being light, thin, soft and the like, can be processed into various shapes and can be worn and attached, the high-flexibility single response for moisture can be realized, and the sensor also has the advantages of high accuracy, high reliability, long service life, simple and controllable preparation technology and cheap and abundant raw materials and is suitable for large-scale industrial production, and a constructed non-contact humidity switch system can realize finger non-contact approaching visible display.

Description

technical field [0001] The invention relates to a sensor, in particular to a stickable ion-type flexible humidity sensor and its preparation method and application. Background technique [0002] Humidity sensor refers to a sensor that detects the humidity of the external environment, and converts the measured environmental humidity into an electrical (frequency) signal that is easy to process, display, and record. It is an important class of chemical sensors and has a wide range of applications in storage, industrial production, process control, and environmental monitoring. There are many types of humidity sensors. Since the advent of the electrolyte resistance type humidity sensor represented by LiCl in the 1930s, new humidity-sensitive materials and structural forms have emerged continuously. Among them, polymer resistive thin-film humidity sensors have gradually replaced inorganic ceramic sensors and become the key direction of humidity sensor development because of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/121G01N27/126
Inventor 李铁张珽徐雁丁海燕
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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