Humidity-sensitive film based on chitosan and polypyrrole and preparation method and application thereof

A moisture-sensitive film and polypyrrole technology, applied in applications, sensors, diagnostics, etc., can solve problems such as reducing the stability of QCM sensors

Active Publication Date: 2021-06-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at higher relative humidity, the polymer will swell, reducing the stability of the QCM sensor

Method used

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  • Humidity-sensitive film based on chitosan and polypyrrole and preparation method and application thereof
  • Humidity-sensitive film based on chitosan and polypyrrole and preparation method and application thereof
  • Humidity-sensitive film based on chitosan and polypyrrole and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Such as Figure 1-12 Shown, a kind of humidity-sensitive film based on chitosan and polypyrrole, described humidity-sensitive film is based on the compound humidity-sensitive film of chitosan (CS) and polypyrrole (PPy), described CS / PPy compound humidity-sensitive film The film is a porous, high specific surface area, stacked and staggered incomplete covering structure.

[0074] The thickness of the CS / PPy composite moisture-sensitive film is 50-70nm, and the water contact angle is 21.07°.

[0075] The present invention comprises a kind of method for preparing the humidity-sensitive film based on chitosan and polypyrrole, comprises the steps:

[0076] (1) Add chitosan powder to the acetic acid solution, stir while adding, and magnetically stir for 10 h, and obtain light yellow transparent chitosan solution by standing for defoaming;

[0077] (2) adding pyrrole and ammonium sulfate to deionized water, stirring continuously for 4h, then filtering, and centrifugally wash...

Embodiment 2

[0117] Such as figure 1 Shown, a kind of breathing detection system based on QCM humidity sensor, described system comprises the QCM humidity sensor based on chitosan (abbreviated as CS) and polypyrrole (abbreviated as PPy) composite film, breathing detection mask, QCM vibrator , QCM frequency tester, breathing detection APP. The system senses the respiratory humidity signal through the respiratory mask constructed by the humidity sensor, collects the signal through the QCM tester, and extracts the characteristic parameters of the respiratory signal according to the requirements through the App with human-computer interaction, judges the respiratory type, calculates the respiratory frequency and generates a corresponding Breathing type detection report.

[0118] The QCM humidity sensor of the CS / PPy composite film includes a humidity sensitive film, a QCM element, and a wire; the humidity sensitive film is coated on one electrode side of the QCM element.

[0119] The breathi...

Embodiment 3

[0163] A kind of preparation method of CS / PPy composite humidity sensitive film, carry out according to the following steps:

[0164] ①Add 0.4g CS powder to acetic acid solution (0.05M, 100mL), stir while adding, and magnetically stir for 10h. After static defoaming, a light yellow transparent CS solution (4 mg·mL -1 );

[0165] ② Add pyrrole (0.1M) and APS (0.1M) to 100mL deionized water, stir continuously for 4h, then filter, wash with deionized water 4 times, the rotation speed is 7000r / min, and the single washing time is 3min;

[0166] ③ Dry the black precipitate obtained in step ② at 50°C for 12 hours, and then grind it into a fine black PPy powder;

[0167] ④Add the PPy powder obtained in step ③ into the CS solution described in ①, and use magnetic stirring for physical blending. The resulting solution was sonicated for 40 min to form a homogeneous CS / PPy suspension;

[0168] ⑤ Transfer the suspension obtained in step ④ to the spraying device, use a self-made baffle ...

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Abstract

The invention relates to the technical field of humidity-sensitive materials, in particular to a humidity-sensitive film based on chitosan and polypyrrole and a preparation method and application thereof. The humidity-sensitive film is a composite humidity-sensitive film based on chitosan (CS) and polypyrrole (PPy), and the CS / PPy composite humidity-sensitive film is of a multi-pore, high-specific-surface-area, stacked and staggered incomplete coating structure. And the prepared CS / PPy-QCM humidity sensor is prepared. The obtained sensor has the advantages of high sensitivity (52.91 Hz / % RH), low humidity hysteresis (1.68% RH), short response / recovery time (4s / 2s), good selectivity, good repeatability, good stability and the like. The invention constructs a human respiration detection system. According to the system, a breathing mask constructed by a humidity sensor is used for sensing a breathing humidity signal, a QCM tester is used for collecting the signal, and an App with a human-computer interaction interface is used for extracting characteristic parameters of the breathing signal, judging the breathing type, calculating the breathing frequency and generating a corresponding breathing type detection report according to requirements. And a potential respiration monitoring value is displayed.

Description

technical field [0001] The invention relates to the technical field of moisture-sensitive materials, in particular to a moisture-sensitive film based on chitosan and polypyrrole, a preparation method and application thereof. Background technique [0002] As an important physical parameter to measure the dryness and humidity of the air, humidity is closely related to human production and life. On the one hand, humidity is of great significance to industrial and agricultural production, food industry, drug storage, and biomedicine. Excessively high humidity will reduce the durability and safety of electrical equipment, and accelerate the growth of bacteria and food mildew; too low humidity will cause static interference and reduce crop yields. On the other hand, ambient humidity also has an important impact on human health. Studies have shown that when the ambient humidity is too low, it is easy to cause respiratory diseases such as asthma and bronchitis; when the ambient hu...

Claims

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Application Information

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IPC IPC(8): G01N5/00A61B5/08
CPCG01N5/00A61B5/082
Inventor 张冬至李停停柳晓华王东岳王兴伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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