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Flexible and wearable pressure sensors and pressure sensor arrays with ultrahigh capacitance

A pressure sensor, ultra-high capacitance technology, applied in instruments, measuring forces, measuring devices, etc., can solve problems such as sensitivity to noise interference, unfavorable applications, etc., to achieve high sensitivity, high signal-to-noise ratio, and rich pressure sensing information. Effect

Active Publication Date: 2022-05-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the physical limitations of this mechanism, its capacitance level is limited to the pF level, which is equivalent to the parasitic capacitance in the circuit and the capacitance level of the external environment noise. It is susceptible to noise interference and has low sensitivity, which is not conducive to the application in the actual environment.

Method used

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  • Flexible and wearable pressure sensors and pressure sensor arrays with ultrahigh capacitance
  • Flexible and wearable pressure sensors and pressure sensor arrays with ultrahigh capacitance
  • Flexible and wearable pressure sensors and pressure sensor arrays with ultrahigh capacitance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a flexible wearable pressure sensor with ultra-high capacitance includes an upper encapsulation layer 1, an upper conductive fabric electrode 21, a middle support frame 4, a lower conductive fabric electrode 51 and a lower encapsulation layer arranged sequentially from top to bottom. Layer 6, the central conductive hydrogel 31 is arranged in the central support frame 4 .

[0038] Wherein, the conductive hydrogel used is cylindrical, with a thickness of 4 mm and a radius of 3 mm. The preparation method of the conductive hydrogel is as follows: dissolving acrylamide monomer (9.98wt%) and sodium chloride or lithium chloride (16.16wt%) in deionized water to prepare an acrylamide-salt ion solution. A solution of N,N-methylenebisacrylamide was prepared as a crosslinking agent, and its solution concentration was 1.2wt%. Next, mix and stir the crosslinking agent solution (1.13wt%), ketoglutaric acid (photoinitiator) (2.2wt%), acrylamide-salt ion sol...

Embodiment 2

[0045] Such as Figure 4 As shown, this embodiment provides a flexible and wearable two-dimensional pressure sensing array with ultra-high capacitance, which includes 16 sensing units, and each sensing unit is arranged in the same plane in an orthogonal arrangement. The specific structure is that the upper encapsulation layer 1, the upper conductive fabric electrode layer 2, the middle conductive hydrogel layer 3, the lower conductive fabric electrode layer 5 and the lower encapsulation layer 6 are sequentially arranged from top to bottom;

[0046] The upper conductive woven electrode layer 2 includes four upper conductive woven electrodes 21 arranged at equal intervals, the lower conductive woven electrode layer 5 includes four lower conductive woven electrodes 51 arranged at equal intervals, the four upper conductive woven electrodes 21 and The four lower conductive fabric electrodes 51 are arranged in a vertically intersecting manner;

[0047] The middle conductive hydroge...

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Abstract

The invention provides a flexible wearable pressure sensor with ultra-high capacitance, which includes an upper encapsulation layer, an upper conductive woven cloth electrode, a middle support frame, a lower conductive woven cloth electrode and a lower encapsulation layer arranged in sequence from top to bottom. The middle support frame is provided with a middle conductive hydrogel. The pressure sensor proposed by the present invention has ultra-high capacitance (can reach nF-μF level), can effectively resist the interference of environmental capacitance noise (pF level), has the advantages of high sensitivity and high signal-to-noise ratio, and can be used for the preparation of wearable Array pressure sensitive skin.

Description

technical field [0001] The invention relates to the technical field of pressure sensors, in particular to a flexible wearable pressure sensor with ultrahigh capacitance and a pressure sensor array. Background technique [0002] Pressure sensors can sense external pressure and convert pressure signals into electrical signals, and have a wide range of applications in industrial production, life and other fields. Traditional pressure sensors rely on rigid electronic devices, which are difficult to adapt to the deformation of soft interfaces such as human skin, so their application fields are limited. [0003] In recent years, emerging flexible pressure sensors use new soft functional materials that are easy to deform and stretch, which have good flexibility and biocompatibility, and can be applied to wearable electronic skin, soft robot tactile perception and other fields. [0004] The mechanism of flexible pressure sensors can be divided into resistive, capacitive, piezoelect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/14
CPCG01L1/142
Inventor 谷国迎沈泽群
Owner SHANGHAI JIAO TONG UNIV
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