Flexible pressure sensor, preparation method thereof, and wearable device

A pressure sensor, flexible technology, applied in the sensor field, can solve the problems of increasing the sensor preparation process and manufacturing cost, the sensor response time lag, limiting the sensor detection range, etc., to achieve easy control of the detection range, ensure stability and repeatability, The effect of eliminating the packaging process

Active Publication Date: 2022-03-18
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design and processing of the micro-nano structure increases the preparation process and manufacturing cost of the sensor. At the same time, this technology is mainly aimed at improving the sensitivity under small deformation, which limits the detection range of the sensor.
However, sensors that compound conductive fillers into a polymer (such as rubber, etc.) matrix as a pressure sensing layer are generally suitable for detecting large deformations, but the detection range is limited and the sensitivity is low, which limits its application range.
At the same time, due to the viscoelasticity and creep behavior of the polymer, there is a lag problem in the response time of the sensor. When a large force is applied, the recovery time of the sensor is longer, and it cannot return to the initial resistance value, and has a slower response time. and poor stability

Method used

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  • Flexible pressure sensor, preparation method thereof, and wearable device
  • Flexible pressure sensor, preparation method thereof, and wearable device
  • Flexible pressure sensor, preparation method thereof, and wearable device

Examples

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preparation example Construction

[0061] In one aspect of the present invention, there is also provided a method for preparing the above-mentioned flexible pressure sensor, comprising the following steps:

[0062] forming an interdigitated electrode with a preset structure on the first flexible substrate by using the graphene composite slurry, and drying to prepare an interdigitated electrode layer;

[0063] Coating a sensing material comprising graphene on a second flexible substrate and drying it to prepare a pressure-sensitive layer; and

[0064] Adhering the interdigital electrode layer and the edge of the pressure-sensitive layer with the adhesive layer having a gap.

[0065] In some embodiments, the specific steps of preparing the interdigital electrode layer include: printing or printing the graphene composite paste on the first flexible substrate to form interdigital electrodes with a preset structure, and drying. The printing may be direct-ink printing, and the printing may be screen printing.

[00...

Embodiment 1

[0076] 1) Preparation of interdigitated electrode layer

[0077] Put 20g of vinyl acetate resin in 80g of dibasic ester solvent, heat and stir at 60°C until the vinyl acetate resin is completely dissolved to form a vinyl acetate resin solution. Then take 20 g of vinyl chloride resin solution, add 0.8 g of graphene, disperse evenly, vacuum defoam and stir for 10 min to prepare graphene composite slurry. Use the screen printing screen to print the graphene composite paste onto the PET film to form a figure 1 The interdigitated electrode with the preset structure shown in (a), wherein the interdigitated electrode has an interdigitated width of 0.25mm, and within an electrode diameter of 8.5mm, the distance between adjacent interdigitated electrodes is 0.75mm, a total of 2 pairs; When the electrode diameter is between 8.5mm and 13.75mm, the distance between adjacent interdigital electrodes is 0.375mm, and there are 4 pairs in total. Subsequently, the PET film containing the inte...

Embodiment 2

[0087] The preparation method of this embodiment is basically the same as that of Embodiment 1, except that the parameters of the interdigitated electrodes are different. Specific steps are as follows:

[0088] 1) Preparation of interdigitated electrode layer

[0089]Put 20g of vinyl acetate resin in 80g of dibasic ester solvent, heat and stir at 60°C until the vinyl acetate resin is completely dissolved to form a vinyl acetate resin solution. Then take 20 g of vinyl chloride resin solution, add 0.8 g of graphene, disperse evenly, vacuum defoam and stir for 10 min to prepare graphene composite slurry. Use the screen printing screen to print the graphene composite paste onto the PET film to form a image 3 The interdigitated electrode with the preset structure shown, wherein the interdigitated electrode has a fork width of 0.25mm, and within an electrode diameter of 8.5mm, the distance between adjacent interdigitated electrodes is 0.375mm, a total of 4 pairs; Between 8.5mm a...

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Abstract

The invention relates to the technical field of sensors, in particular, to a flexible pressure sensor, a preparation method thereof, and a wearable device. The flexible pressure sensor includes an interdigital electrode layer, a pressure-sensitive layer, and an adhesive layer between the interdigitated electrode layer and the pressure-sensitive layer; the distance between adjacent fingers of the interdigital electrode layer has any relationship: (a) by The center of the interdigitated electrode layer is outward, and the distance between adjacent interdigital fingers gradually increases from 0.2mm~0.6mm to 0.6mm~1.2mm; (b) From the center of the interdigital electrode layer outward, the distance between adjacent interdigital fingers Gradually reduce from 0.6mm~1.2mm to 0.2mm~0.6mm; the mass percentage of graphene in the pressure-sensitive layer is 0.6%~2%, and the middle of the adhesive layer is left empty to connect the interdigital electrode layer and the pressure-sensitive layer. The edge parts of the adhesive layer are bonded to form an air cavity between the interdigital electrode layer and the pressure-sensitive layer, and the adhesive layer has a gap so that the air cavity can communicate with the outside world. The detection sensitivity of the sensor is high.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a flexible pressure sensor, a preparation method thereof, and a wearable device. Background technique [0002] Flexible sensors can adapt to more complex application scenarios due to their good flexibility, free bending or even folding, and easy portability. It has broad application prospects in health management, medical treatment, sports science and other fields. At present, researchers mostly use resistive, capacitive, piezoelectric, triboelectric and other sensing mechanisms to prepare high-sensitivity pressure sensors. Among them, resistive sensors have attracted extensive attention from researchers due to their advantages such as simple preparation process, easy-to-read signals, high sensitivity, fast response time, and low cost. Most of the traditional flexible piezoresistive sensors are made of surface conductive coating on the polymer substrate with micro-nano structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 刘静李文博李静王佳伟李炯利王旭东罗圭纳王刚
Owner 北京石墨烯技术研究院有限公司
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