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Flexible capacitive sensor and preparation method thereof

A flexible capacitor and sensor technology, applied in the field of flexible sensors, can solve the problem of low pressure detection range, and achieve the effect of detection and realization of large and small ranges.

Pending Publication Date: 2022-07-26
XI AN JIAOTONG UNIV
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Problems solved by technology

Although these microstructures provide a new way to improve the performance of capacitive pressure sensors, there are still many challenges in the processing of microscale or even nanoscale microstructures.
Using some materials with low elastic modulus such as sponge can increase the sensitivity of the capacitive pressure sensor at low pressure, but the pressure detection range is still relatively low

Method used

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

Examples

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preparation example Construction

[0068] In another embodiment, in step S1, the preparation method of the conductive composite solution includes the following steps: mixing the graphene composite solution and the multi-walled carbon nanotube particles with a mass ratio of 1:0.25 and 0.05 g of polyethylene oxide particles. It was placed in an environment with a stirring temperature of 60° C. and a stirring speed of 1000 r / min, and stirred for 30 minutes, and then crushed in an ultrasonic crusher for 30 minutes to obtain a conductive composite solution.

[0069] In this example, it should be noted that the graphene composite solution and the multi-walled carbon nanotube particles were purchased from Sigma-Aldrich in the United States, the mass fraction of graphene in the graphene composite solution was 0.1%, and the multi-walled carbon nanotube particles The carbon content in it exceeds 98%. The polyethylene oxide particles were purchased from Hefei BASF Co., Ltd., wherein the molar molecular weight of the polye...

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Abstract

The invention discloses a flexible capacitive sensor, which comprises a first electrode layer and a second electrode layer, and is characterized in that the first electrode layer and the second electrode layer both comprise dust-free paper, and the dust-free paper is dip-dyed with a conductive composite solution; a dielectric layer is arranged between the first electrode layer and the second electrode layer, and the dielectric layer comprises a first elastomer and a second elastomer which are different in elastic modulus. The invention also discloses a preparation method of the flexible capacitive sensor. The flexible capacitive sensor has the proximity sense and pressure sensing functions at the same time, and large and small measuring range detection can be achieved during pressure sensing.

Description

technical field [0001] The present disclosure belongs to the technical field of flexible sensors, and in particular relates to a flexible capacitive sensor and a preparation method thereof. Background technique [0002] Flexible pressure sensor is one of the important components of future human-computer interaction, human motion monitoring, electronic skin and soft robots. At present, pressure sensors can be divided into different types such as piezoresistive, capacitive, piezoelectric and triboelectric according to the sensing mechanism. Capacitive sensors that convert pressure signals into capacitive signals are usually composed of a sandwich structure of upper and lower electrodes and an intermediate dielectric layer. Although the capacitive pressure sensor has the characteristics of simple structure and high drift stability, the detection range of this sensor is limited or it is very easy to saturate under high pressure. Traditional capacitive sensors usually use a soli...

Claims

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Application Information

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IPC IPC(8): G01L1/14
CPCG01L1/142
Inventor 孙瑜赵州郭庆凯杨来浩陈雪峰
Owner XI AN JIAOTONG UNIV
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