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Flexible pressure sensor with complementary spiral structure, preparation method and application thereof

A pressure sensor and helical structure technology, which is applied in the fluid pressure measurement, instrument, and measurement force using capacitance change, can solve the problems of electrode ductility and mechanical strength that limit the application of graphene electrodes, reduce sensor performance, and reduce flexibility. Achieve the effects of excellent flexibility, strong ductility, low cost, and good mechanical tensile properties

Active Publication Date: 2021-11-19
吉林大学重庆研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene electrodes prepared by traditional methods of making graphene electrodes, such as chemical exfoliation, chemical vapor deposition, and dispersion adhesion, often need to be attached to special substrates, which more or less reduces its flexibility, thereby Reduced sensor performance
[0003] In addition, arbitrary patterning of graphene electrodes is also a technical challenge that limits the performance optimization of capacitive pressure sensors. At present, people use high-temperature reduction, chemical reduction, inkjet reduction, etc., which can only achieve some simple patterned reduction, and there is also a resolution. Low, slow restore speed and other issues
In addition, the ductility and mechanical strength of electrodes also greatly limit the application of graphene electrodes in flexible capacitive pressure sensors.

Method used

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  • Flexible pressure sensor with complementary spiral structure, preparation method and application thereof
  • Flexible pressure sensor with complementary spiral structure, preparation method and application thereof
  • Flexible pressure sensor with complementary spiral structure, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0051] A flexible pressure sensor with a complementary helical structure, the flexible pressure sensor is composed of upper and lower composite electrodes and a dielectric layer, the composite electrode is composed of a composite film material 1 and a nano-helical structure 2, the dielectric layer It is a porous material 3, and the composite film material 1 is a composite film material with a smooth surface formed by mixing graphene oxide solution and silk fibroin solution and suction filtration; the composite film material 1 has a nanohelical structure 2 formed on the surface, and the composite film material 1 has a nanohelical structure 2. The outer surface of the film material 1 and the nano-helical structure 2 is adhered with a porous material 3, and the upper and lower electrodes and the dielectric layer form a composite film material 1-nano-helical structure 2-porous material 3-nano-helical structure 2-composite film material 1 multilevel micro-nano structures.

[0052] ...

Embodiment 2

[0057] like figure 1 As shown, a method for preparing a flexible pressure sensor with a complementary helical structure based on laser processing, the specific steps are as follows:

[0058] (1), the preparation of graphene oxide / silk fibroin mixed solution;

[0059]Use a rubber dropper to draw 20 mL of graphene oxide solution with a concentration of 8 mg / mL and put it into a beaker with a capacity of 100 mL, and then add 3 mL of sodium hydroxide solution with a concentration of 0.05 mol / L dropwise to make the pH of the graphene oxide solution value is 7, then add 2mL of silk fibroin solution with a concentration of 40mg / mL, then put the beaker containing the graphene oxide / silk fibroin mixture on a magnetic stirrer and stir for 10s-1min, after mixing evenly, the oxidized Graphene / Silk Fibroin Hybrid Solution.

[0060] Wherein, the graphene oxide solution used is synthesized by Hummer's method, and the specific synthesis steps are as follows: firstly, graphite and sodium nit...

Embodiment 3

[0071] This embodiment provides an application of a flexible pressure sensor with a complementary helical structure based on laser processing for finger bending detection. The specific steps are as follows:

[0072] First, use 3M adhesive tape to attach the helical complementary structure pressure sensor to the joint of the index finger (attached when the finger is straight), and then connect the wires at both ends of the helical complementary structure pressure sensor to the LCR-6200 digital bridge tester, and use a protractor to calibrate The bending angle of the index finger joint, when the finger joint is bent at 0°, 30°, 60°, and 90°, the relative change of the capacitance of the pressure sensor with the helical complementary structure (ΔC / C 0 ) are 0, 0.21, 0.33, 0.48 respectively; when the finger is bent, the parallel plate capacitor It can be obtained that the distance d between the upper and lower electrodes decreases during bending, and at the same time, the air wit...

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Abstract

The invention discloses a flexible pressure sensor with a complementary spiral structure, a preparation method and application thereof, and belongs to the technical field of laser micro-nano machining. Laser is utilized to process the surface of a graphene oxide / silk fibroin composite film, and the photothermal effect of the laser can remove oxygen-containing functional groups in the graphene oxide, so that the graphene oxide is reduced and a spiral structure electrode is formed at the same time; after a porous adhesive tape is clamped between the pair of electrodes with the complementary spiral structures, the high-performance flexible pressure sensor with the complementary spiral structures is obtained, dual-mode detection of finger bending and finger approaching can be achieved, the porous structure of the adhesive tape is beneficial to large change of capacitance when the sensor is bent, and accurate detection of finger bending can be realized. And meanwhile, the spiral structure of the electrode increases the area of the edge region of the electrode, so that more electric fields can be expanded from the electrode plate region to the outer space, and sensitive detection of finger approach is realized.

Description

technical field [0001] The invention belongs to the technical field of laser micro-nano processing, and specifically relates to a flexible pressure sensor with a complementary helical structure, a preparation method and an application thereof. Background technique [0002] Flexible capacitive pressure sensors have broad application prospects in cutting-edge applications such as electronic skin, human-computer interaction, and wearable health monitoring. The innovation of capacitive pressure sensors mainly relies on new electrode materials and structures. Graphene has become a commonly used electrode material in various flexible electronic devices due to its excellent electrical conductivity, flexibility, and mechanical strength. Graphene electrodes prepared by traditional methods of making graphene electrodes, such as chemical exfoliation, chemical vapor deposition, and dispersion adhesion, often need to be attached to special substrates, which more or less reduces its flex...

Claims

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Application Information

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IPC IPC(8): G01L1/14G01L9/12
CPCG01L1/142G01L9/12
Inventor 韩冬冬张永来张嘉芮孙洪波
Owner 吉林大学重庆研究院
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