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A sensor with conductive foam electrodes combined with flexible strain gauges and its preparation method

A conductive foam and sensor technology, applied in the measurement of the property force of the piezoelectric resistance material, fluid pressure measurement by changing the ohmic resistance, instruments, etc., can solve the incomplete contact of the strain gauge, limit the use environment of the flexible stress sensor, Electrode floating and other problems, to achieve the effect of low cost, simple and easy control process, and avoid floating

Active Publication Date: 2022-01-28
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation process of the existing flexible stress sensor, due to the incomplete contact between the strain gauge and the electrode, the sensor has the problem of electrode floating during the straining process, and the external force directly leads to the resistance change caused by the contact of the electrode, which is seriously limited. Therefore, it is necessary to develop a new type of flexible stress sensor that solves the influence of electrode contact

Method used

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  • A sensor with conductive foam electrodes combined with flexible strain gauges and its preparation method
  • A sensor with conductive foam electrodes combined with flexible strain gauges and its preparation method
  • A sensor with conductive foam electrodes combined with flexible strain gauges and its preparation method

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Effect test

Embodiment 1

[0025] see figure 1 In the preparation process, first take 1mL of PDMS solution, add 0.05g of curing agent and 10μL of acetic acid to it, then add 0.02g of Ni nanowires, and stir at room temperature for 10min to obtain a Ni / PDMS mixed solution; then take two pieces of pore size The 2μm conductive nickel foam adheres to the surface of the smooth substrate. There is a certain gap between the two conductive nickel foams, and the gap width is 3mm; drop the Ni / PDMS mixed solution between the two nickel foams to fill the gap and brush the solution. , part of the solution penetrated into the nickel foam, and then cured at a temperature of 60°C for 12 hours; after curing, the Ni / PDMS mixed solution formed a flexible strain gauge, which combined with the conductive nickel foam on both sides to form a sheet-like structure. After taking out the sheet structure, lead out two electrodes on the nickel foam with two wires to complete the preparation of the stress sensor.

[0026] see figu...

Embodiment 2

[0029] First take 1mL of PMMS solution, add 0.12g of curing agent and 20μL of acetic acid to it, then add 0.05g of Cu nanowires, and stir at room temperature for 10min to obtain a Cu / PMMS mixed solution; then take two pore diameters of 50μm Conductive copper foam adheres to the surface of the smooth substrate, and there is a certain gap between the two conductive copper foams, the gap width is 50mm; drop the Cu / PMMS mixed solution between the two copper foams, fill the gap and brush the solution, part of the solution Penetrate into the copper foam, and then cure at 40°C for 5 hours; after curing, the Cu / PMMS mixed solution forms a flexible strain gauge, which combines with the conductive copper foam on both sides to form a sheet structure, and the sheet is taken out from the smooth substrate After the structure, two electrodes are drawn out with two wires on the copper foam to complete the preparation of the stress sensor.

Embodiment 3

[0031] First take 1mL of PDMS solution, add 0.2g of curing agent and 30μL of acetic acid to it, then add 0.1g of Ni nanowires, and stir at room temperature for 10min to obtain a Ni / PDMS mixed solution; then take two pieces of 80μm pore diameter The conductive nickel foam adheres to the smooth substrate surface, and there is a certain gap between the two conductive nickel foams, the gap width is 60mm; drop the Ni / PDMS mixed solution between the two nickel foams, fill the gap and brush the solution, part of the solution Penetrate into the nickel foam, and then cure at 80°C for 20 hours; after curing, the Ni / PDMS mixed solution forms a flexible strain gauge, which combines with the conductive nickel foam on both sides to form a sheet structure, and the sheet is taken out from the smooth substrate. After the structure, two electrodes are drawn out with two wires on the nickel foam to complete the preparation of the stress sensor.

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Abstract

The invention discloses a sensor with a conductive foam electrode combined with a flexible strain gauge and a preparation method. The sensor includes a flexible sheet and conductive foam symmetrically arranged along both ends of the flexible sheet; the flexible sheet is in contact with the foam electrode; the flexible sheet is dispersed by conductive nanowires on It is prepared in an organic solvent containing a curing agent; the conductive foam is provided with wires. The preparation process is to disperse the conductive nanowires in an organic solvent containing a curing agent to obtain a mixed solution; then titrate the mixed solution between symmetrically placed conductive foams with gaps, so that the mixed solution fills the gaps and solidifies; , and lead wires from the conductive foam as electrodes to obtain a stress-resistive sensor. The invention ensures sufficient and strong contact between the strain gauge and the electrode, the control process is simple and easy, the cost is low, and the prepared sensor has stable resistance and high sensitivity.

Description

technical field [0001] The invention belongs to a resistance variable stress sensor, in particular to a stress resistance variable sensor using foam porous electrodes and strain gauges and a preparation method thereof. Background technique [0002] Flexible stress sensors have the advantages of miniature, ultra-light, high stability, and easy integration, and are currently widely used in the measurement of pressure, liquid flow, and acceleration. In recent years, flexible stress sensors have shown great application value in electronic skin, intelligent transportation, and intelligent human-computer interaction interface, which has attracted extensive attention from the scientific research community and the industry. However, how to fabricate highly sensitive and stable flexible stress sensors using simple fabrication methods is still a worthy research direction. In the manufacturing process of the existing flexible stress sensor, due to the incomplete contact between the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/18G01L9/06G01L19/00
CPCG01L1/18G01L9/06G01L19/00
Inventor 楚亮栾瑞霏安航巩冉毛巍威李兴鳌
Owner NANJING UNIV OF POSTS & TELECOMM
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