Pressure sensor with porous graphene foam structure and preparation method thereof

A porous graphene, pressure sensor technology, applied in the field of sensors, can solve the problems of low sensitivity of flexible pressure sensors, expensive materials, small measurable range, etc., and achieve high market value and industrialization potential, low price, low cost. Effect

Inactive Publication Date: 2017-08-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of flexible pressure sensor based on new nano-material technology generally has problems such as low sensitivity and small measurable range, which are also limited in application.
Pressure sensors based on new materials still have problems such as expensive materials and complicated processes, and encounter many bottlenecks in market promotion.

Method used

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  • Pressure sensor with porous graphene foam structure and preparation method thereof
  • Pressure sensor with porous graphene foam structure and preparation method thereof
  • Pressure sensor with porous graphene foam structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 The schematic diagram of the basic structure of the novel pressure sensor provided by the present invention, wherein the sensor includes an electrode, a porous graphene foam structure, and silver paste is used as the connection between the porous graphene foam structure and the electrode to increase conductivity, and the electrode is aluminum The electrodes are bonded on the upper and lower sides of the porous graphene foam structure through silver paste. The electrodes are connected to the test circuit. The porous graphene foam structure is composed of porous polydimethylsiloxane and reduced graphene oxide.

[0030] Since the porous graphene foam structure has more porous structures, when pressure acts on the pressure sensor, the structure will be squeezed, and the connection state of the reduced graphene oxide will change, and its resistance will also change. Thereby converting the pressure signal into an electrical signal. The electrodes are made of alumi...

Embodiment 2

[0037] The pressure sensor made in Example 1 was connected to the test circuit, and the pressure was applied with a pull-pressure tester (model SHIMADZUAGS-X), and the resistance value was recorded with a digital multimeter (model ROGOL DM3068). When no pressure is applied, the initial resistance is 300 kΩ.

[0038] image 3 It shows the pressure characteristic curve of the sensor in Example 1 of the present invention, wherein the measurement range can reach above 150kPa, and the sensitivity can reach above 3.5, and the sensor that reflects the pressure has a larger sensitivity and a larger measurement range at the same time.

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Abstract

The invention provides a pressure sensor with a porous graphene foam structure. The pressure comprises electrodes and the porous graphene foam structure. Silver paste is used for connecting the porous graphene foam structure and the electrodes for improving conductivity. The electrodes are made of one selected from aluminum strip, silver wire and copper plate. The electrodes are adhered on the upper surface and the lower surface of the porous graphene foam structure through the silver paste. The invention further provides a preparation method of the pressure sensor. Compared with prior art, the pressure sensor provided by the invention has advantages of low cost, high sensitivity and large measurement range. The pressure sensor is made of a flexible material and can be used for a novel wearable device. The pressure sensor has advantages of simple preparation process, easy industrialization, high market value and high industrialization potential.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a sensor for pressure signal collection. Background technique [0002] In recent years, with the continuous development of electronic information technology and material technology, smart wearable devices have emerged rapidly and have been greatly improved. While greatly facilitating people's lives, they have also opened up new areas for the development of information technology. The rapid development of wearable devices has created a huge demand for new flexible sensors, especially flexible pressure sensors. However, many of the existing pressure sensors are based on silicon substrates and are manufactured based on traditional microelectronics processes, which cannot be applied to wearable devices. For example, patent CN105784254A discloses a flexible pressure sensor and a touch screen. The flexible pressure sensor includes a dielectric layer, a first electrode layer above the dielectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18G01L9/02
CPCG01L1/18G01L9/02
Inventor 任天令王丹阳陶璐琪刘莹杨轶
Owner TSINGHUA UNIV
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