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Sensor prepared from combination of conductive foam electrode and flexible strain gauge, and preparation method thereof

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

Active Publication Date: 2021-03-09
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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  • Sensor prepared from combination of conductive foam electrode and flexible strain gauge, and preparation method thereof
  • Sensor prepared from combination of conductive foam electrode and flexible strain gauge, and preparation method thereof
  • Sensor prepared from combination of conductive foam electrode and flexible strain gauge, and preparation method thereof

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Experimental program
Comparison scheme
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 prepared from a combination of a conductive foam electrode and a flexible strain gauge, and a preparation method thereof. The sensor comprises the flexible gauge and conductive foam symmetrically arranged along the two ends of the flexible gauge, wherein the flexible gauge is in contact with the foam electrode; the flexible gauge is prepared by dispersing conductive nanowires in an organic solvent containing a curing agent; and wires are arranged on the conductive foam. The preparation method comprises the following steps: dispersing the conductive nanowires inthe organic solvent containing the curing agent to obtain a mixed solution; then titrating the mixed solution between the symmetrically placed conductive foam with a gap, allowing the gap to be filled with the mixed solution, and curing the mixed solution; and after curing is completed, leading out the wires from the conductive foam to enable the conductive foam to serve as an electrode, therebyobtaining the stress resistance change sensor. According to the invention, sufficient and strong contact between the strain gauge and the electrode is ensured, a regulation and control process is simple and feasible, cost is low, and the prepared sensor is stable in resistance change and high in 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 Applications(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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