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Flexible pressure sensor and preparation method thereof, and wearable equipment

A pressure sensor and flexible technology, applied in the field of sensors, can solve the problems of increasing the sensor preparation process and manufacturing cost, limiting the detection range of the sensor, and delaying the response time of the sensor, achieving easy control of the detection range, ensuring stability and repeatability, The effect of eliminating the packaging process

Active Publication Date: 2021-12-10
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 and preparation method thereof, and wearable equipment
  • Flexible pressure sensor and preparation method thereof, and wearable equipment
  • Flexible pressure sensor and preparation method thereof, and wearable equipment

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

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

[0062] The graphene composite slurry is formed on the first flexible substrate to form a preset structure, dry, prepared fork finger electrode layer;

[0063] The sensing material containing graphene is applied to the second flexible substrate and dried to prepare a compactive layer;

[0064] The onk finger electrode layer and the edge of the pressure sensitive layer are adhered by the adhesive layer having a gap.

[0065] In some embodiments, the specific steps of the preparing fork finger electrode layer include printing or printing the graphene composite slurry or printed on the first flexible substrate to form a preset structure to form a preset structure, drying. The printing can be printed directly, the printing can be a screen printing.

[0066] In some embodiments, the coating method can be screen printing, scraper coa...

Embodiment 1

[0076] 1) Preparation of the fork finger electrode layer

[0077] 20g of 20 g of a chlocetic resin was placed in a 80 g of a nutrioticate solvent, and the mixture was heated at 60 ° C to completely dissolve the chlorine resin, forming a chlorine resin solution. Then 20 g of a chlocene resin solution was taken, 0.8 g of graphene is added, and the dispersion is uniformly dispersed. The graphene composite slurry is printed onto the PET film using the silk screen version. figure 1 The fork finger electrode of the preset structure shown in (a), wherein the fork finger width of the fork finger electrode is 0.25 mm, and the distance between the electrode diameter is 8.5 mm, and the distance between the adjacent finger electrodes is 0.75 mm, a total of 2 pairs; At the electrode diameter of 8.5 mm to 13.75 mm, the distance between adjacent finger electrodes is 0.375 mm, and a total of 4 pairs. The PET film containing the fork refers to the electrode structure is then heated in an oven of 9...

Embodiment 2

[0087] The present embodiment is substantially the same as the preparation method of Example 1, and the difference is that the fork refers to the electrode parameters. Specific steps are as follows:

[0088] 1) Preparation of the fork finger electrode layer

[0089]The vinegar chloride resin was placed 20g 80g dibasic ester solvent, it was heated at 60 deg.] C and stirred until the resin was completely dissolved chlorine vinegar, vinegar chloride resin solution is formed. Then take 20g vinegar chloride resin solution, was added 0.8g graphene dispersion vacuum degassing Stir 10min, to obtain graphene composite slurry. The use of silk screen printed onto the graphene composite slurry on a PET film, is formed as image 3 Fork structure shown preset finger electrodes, wherein the interdigital electrode of an interdigital width of 0.25mm, 8.5mm in inner diameter of the electrode, the distance between the adjacent interdigital electrodes 0.375 mm, a total of four pairs; electrode diamete...

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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 wearable equipment. The flexible pressure sensor comprises an interdigital electrode layer, a pressure-sensitive layer and an adhesion layer located between the interdigital electrode layer and the pressure-sensitive layer. The distance between the adjacent interdigitals of the interdigital electrode layer has any relation: (a) from the center of the interdigital electrode layer to the outside, the distance between the adjacent interdigitals is gradually increased from 0.2 mm-0. 6 mm to 0.6 mm-1. 2 mm; (b) from the center of the interdigital electrode layer to the outside, the distance between adjacent interdigitals is gradually reduced to 0.2 mm-0. 6 mm from 0.6 mm-1. 2 mm; the mass percentage content of graphene in the pressure-sensitive layer is 0.6%-2%, a gap is reserved in the middle of the adhesion layer to adhere the interdigital electrode layer and the edge of the pressure-sensitive layer so that an air cavity can be formed between the interdigital electrode layer and the pressure-sensitive layer, and the adhesion layer is further provided with a notch so that the air cavity can be communicated with the outside. The sensor is high in detection sensitivity.

Description

Technical field [0001] The present invention relates to the field of sensor technology, particularly, it relates to a flexible pressure sensor and its preparation method, the wearable device. Background technique [0002] Due to the flexible sensor having a good flexibility, can be bent freely even foldable, easy to carry, and can adapt to more complex scenarios. In the field of health management, medical, sports science has broad application prospects. Currently many researchers to produce a high sensitivity pressure sensor using resistive, capacitive, piezoelectric, electric and other frictional sensing mechanism. Wherein the resistive sensor due to a simple manufacturing process, the signal is easy to read, with high sensitivity and fast response time and low cost advantages of being much attention. Most conventional flexible piezoresistive sensors having a polymer substrate in the micro-nano structure as the surface coating of a conductive composite or conductive filler to th...

Claims

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Application Information

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Patent Type & Authority Applications(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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