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Flexible capacitive sensor and preparation method and application thereof

A flexible capacitor and sensor technology, applied in the field of flexible sensors, can solve problems such as nonlinearity, limited application range of capacitive sensors, external environmental interference, etc., achieve high linearity and signal-to-noise ratio, broaden the sensing range and application fields, and prevent effect of disease

Inactive Publication Date: 2021-06-04
BEIJING UNIV OF POSTS & TELECOMM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to provide a flexible capacitive sensor to solve the problems of limited application range of current capacitive sensors, nonlinear characteristics and easy interference from the external environment; the flexible capacitive sensor of the present invention has a high sensing range and high linearity and high signal-to-noise ratio

Method used

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  • Flexible capacitive sensor and preparation method and application thereof
  • Flexible capacitive sensor and preparation method and application thereof
  • Flexible capacitive sensor and preparation method and application thereof

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preparation example Construction

[0061] According to another aspect of the present invention, the present invention also relates to the preparation method of described flexible capacitive sensor, comprises the following steps:

[0062] adhering the flexible electrode to the surface of the dielectric layer;

[0063] The dielectric layer is mainly obtained by compounding the inorganic high dielectric particles and the flexible dielectric elastomer substrate.

[0064] The preparation method of the flexible capacitive sensor provided by the invention has the advantages of easy control of the experimental process, suitable for large-scale production and the like.

[0065] Preferably, the preparation method of the dielectric layer includes: drying the mixture of the solution of the flexible dielectric elastomer substrate and the inorganic high dielectric particles.

[0066] The drying of the present invention adopts constant temperature drying, which can quickly solidify the coated mixed solution and shorten the p...

Embodiment 1

[0101] A preparation method for a flexible capacitive sensor, comprising the following steps:

[0102] (a) preparing butyl acrylate by atom transfer radical polymerization, the heating temperature of the atom transfer radical polymerization is 60°C, and the heating time is 12h;

[0103] (b) preparing barium titanate particles by a sol-precipitation method, the heating temperature of the sol-precipitation method is 160°C, and the heating time is 4h;

[0104] (c) Add barium titanate to the butyl acrylate solution in proportion, after ultrasonic stirring for 3 hours, pour it on a glass plate, and dry at a constant temperature of 70°C for 12 hours to obtain a cured composite film; the thickness of the composite film is 100 μm , the volume ratio of barium titanate particles and composite film is 1:8;

[0105] (d) Ultrasonicating the single-walled carbon nanotubes in an aqueous solution of alkyl sodium dodecahydrate for 3 hours, and suction filtering onto filter paper to prepare si...

Embodiment 2

[0109] A preparation method for a flexible capacitive sensor, comprising the following steps:

[0110](a) preparing butyl acrylate by atom transfer radical polymerization, the heating temperature of the atom transfer radical polymerization is 50°C, and the heating time is 15h;

[0111] (b) preparing barium titanate particles by a sol-precipitation method, the heating temperature of the sol-precipitation method is 150°C, and the heating time is 5h;

[0112] (c) Add barium titanate in proportion to the butyl acrylate solution, stir ultrasonically for 2-3 hours, pour it on a glass plate, and dry it at a constant temperature of 80°C for 10 hours to obtain a cured composite film; the thickness of the composite film 80μm, the volume ratio of barium titanate particles and composite film is 1:12;

[0113] (d) Ultrasonicating the single-walled carbon nanotubes in an aqueous solution of alkyl sodium dodecahydrate for 2 hours, and suction filtering onto filter paper to prepare single-wa...

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Abstract

The invention relates to the field of flexible sensors, in particular to a flexible capacitive sensor and a preparation method and application thereof. The flexible capacitive sensor comprises a dielectric layer and a flexible electrode, the flexible electrode is arranged on the surface of the dielectric layer, and the dielectric layer comprises a flexible dielectric elastomer substrate and inorganic high-dielectric particles. The flexible capacitive sensor has good stretchability and good dielectric response performance at the same time, the sensor is endowed with a high-baseline initial capacitance value by adding the inorganic high-dielectric particles, the capacity of the sensor for resisting pF-level electromagnetic interference in the external environment is improved, and the sensing range and the application field of the sensor are widened.

Description

technical field [0001] The invention relates to the field of flexible sensors, in particular to a flexible capacitive sensor and its preparation method and application. Background technique [0002] With the rapid development of artificial intelligence, human-computer interaction and the Internet of Things, flexible sensors have received extensive attention. Capacitive sensors have been widely researched and applied in the fields of medical rehabilitation, daily monitoring, and biometrics due to their advantages of simple structure, short response time, and no influence of temperature and humidity. [0003] Early capacitive sensors usually used hard semiconductor materials and metal electrodes as substrates and electrodes, which limited their flexibility and application scenarios. As the research found, the dielectric elastomer film has good flexibility and stretchability, and can withstand large deformation without breaking. However, the dielectric constant of the dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/021A61B5/0245A61B5/107
CPCA61B5/021A61B5/0245A61B5/1071
Inventor 郝亚楠秦婧毕科封烁钟少龙党智敏
Owner BEIJING UNIV OF POSTS & TELECOMM
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