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Sensitive film for humidity/salinity sensor, preparation method and application thereof

A sensitive film and sensor technology, which is applied in the field of chemical/biological sensors, can solve problems such as complex experimental operations, low sensitivity of salinity/humidity sensors, and inability to fully meet the sensor sensitivity requirements, and achieve simplified production processes, high sensitivity, and friendly The effect of water performance enhancement

Active Publication Date: 2019-02-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huang Deyi and others proposed a fiber grating temperature / humidity sensor in their utility model patent (publication number CN 202869694 U), which is prepared by using a moisture-sensitive material represented by a polyimide layer on the surface of the fiber grating, but The salinity / humidity sensor is not very sensitive
Xu Jian et al. used pure polyimide as the moisture-sensitive material to coat the surface of the fiber grating to prepare the salinity sensor. Even if the method of increasing the film thickness (the film thickness of the sensor reaches 50 μm), its sensitivity to the salt solution test is only 25pm / (mol / L), not only cannot fully meet the sensor sensitivity requirements, but also the experimental operation is more complicated

Method used

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  • Sensitive film for humidity/salinity sensor, preparation method and application thereof
  • Sensitive film for humidity/salinity sensor, preparation method and application thereof
  • Sensitive film for humidity/salinity sensor, preparation method and application thereof

Examples

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Embodiment 1

[0031] In this embodiment, polyimide doped with carbonyl iron powder is selected and coated on the surface of a fiber grating to prepare a salinity fiber sensor. The particle size of the selected carbonyl iron powder is less than 10 μm, the activity is high, and the color is dark gray. The polymer swelling material used is polyimide with a concentration of 12% to 14%; the silane coupling agent is KH-550.

[0032] A kind of humidity / salinity fiber grating sensor, the sensitive film on its fiber grating surface comprises carbonyl powder doped polymer swelling material coating, the preparation method of described humidity / salinity sensor sensitive film is as follows:

[0033] (1) Preparation of modified carbonyl iron powder: install a constant temperature water bath heating device and a mechanical stirrer, and a three-necked flask with a dropping device; weigh the silane coupling agent, Absolute ethanol and deionized water, according to the mass ratio of silane coupling agent an...

Embodiment 2

[0040] This embodiment uses acrylamide polymerization to obtain the desired polymer swelling material (hydrogel). The carbonyl powder used is a mixture of carbonyl iron powder and carbonyl nickel powder (according to any proportion). The particle size of the carbonyl powder is less than 10 μm and has a large activity , dark gray in color.

[0041] A kind of optical fiber method Perth humidity / salinity optical fiber sensor, the sensitive film on the surface of its optical fiber method comprises a carbonyl powder-doped polymer swelling material coating, and the preparation method of the humidity / salinity sensor sensitive film is as follows:

[0042] (1) Preparation of modified carbonyl powder: install a constant temperature water bath heating device and a mechanical stirrer, and a three-necked flask with a dropping device; Water, ethanol and deionized water, weigh the carbonyl powder according to the mass ratio of silane coupling agent and carbonyl iron powder at a ratio of 1:10...

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Abstract

The invention belongs to the field of chemical / biological sensors, and particularly relates to a humidity / salinity sensor sensitive membrane based on a carbonyl powder doped polymer swelling material, a preparing method thereof and applications of the sensitive membrane. The sensitive membrane comprises a carbonyl powder doped polymer swelling material coating. The coating is formed from a carbonyl powder doped polymer swelling material solution through soaking, pulling or spin-coating and curing. The carbonyl powder doped polymer swelling material comprises a polymer swelling material and modified carbonyl powder. The humidity / salinity sensor sensitive membrane based on the carbonyl powder doped polymer swelling material is provided. When the sensitive membrane is applied for sensors, sensitivity is high. The sensitive membrane is low in thickness. Compared with a fact that traditional methods improve sensitivity through increasing the thickness of sensitive membranes, the preparing process of the sensitive membrane is simplified, the cost is saved, and the sensitive membrane has high practical application value.

Description

technical field [0001] The invention belongs to the field of chemical / biological sensors, and in particular relates to a humidity / salinity sensor sensitive film based on carbonyl powder-doped polymer swelling material and its preparation method and application. Background technique [0002] Seawater salinity is the ratio of the mass of dissolved substances in seawater to the mass of seawater, and is an important physical quantity for studying ocean physical and chemical processes. Detecting changes in salinity is important for both practical applications and scientific research. [0003] Air humidity is a meteorological element that indicates the water vapor content and degree of humidity in the air. At a certain temperature, the less water vapor contained in a certain volume of air, the drier the air; the more water vapor, the wetter the air. In this sense, physical quantities such as absolute humidity, relative humidity, comparative humidity, mixing ratio, saturation diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/00G01N19/10C08L79/08C08L33/26C08K9/06C08K3/08
CPCC08K3/08C08K9/06C08K2003/0856C08K2003/0862C08K2201/003G01N19/00G01N19/10C08L79/08C08L33/26
Inventor 胡文彬龚铮高敏
Owner WUHAN UNIV OF TECH