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Flexible strain sensor and preparation method thereof, and application of flexible strain sensor

A strain sensor and strain sensing technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, catheter, etc., can solve the problems of limitation, high cost, low sensitivity, etc., to achieve convenient attachment, high durability, bending sensitivity, etc. good effect

Active Publication Date: 2018-09-21
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional strain sensors mainly focus on high stretchability and high sensitivity test motion under high deformation, while in the state of micro deformation, their low sensitivity limits their application in the fields of heartbeat monitoring, pulse wave detection, or sound signal acquisition and recognition. Applications
Existing technologies (such as CN 107655398 A, CN 107720685 A) use graphene and its composite products as strain-sensing materials to prepare flexible strain sensors. The above-mentioned preparation method is complex, the preparation process is difficult to control, and the cost is high. The conductivity of the strain sensor Low, can not achieve its high sensitivity in micro-deformation state such as biomedical detection

Method used

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  • Flexible strain sensor and preparation method thereof, and application of flexible strain sensor
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  • Flexible strain sensor and preparation method thereof, and application of flexible strain sensor

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preparation example Construction

[0046]The preparation method of the above-mentioned flexible strain sensor first prepares the AgNWs / RGO composite material according to the following steps, then arranges electrodes on the AgNWs / RGO composite material, and uses a flexible packaging layer for insulating packaging, thereby preparing a flexible strain sensor——

[0047] S1) Disperse unreduced graphite oxide GO into dimethylformamide solution, and make GO suspension by ultrasonic treatment;

[0048] S2) Add silver nanowire AgNWs solution to the GO suspension prepared in step S1 and stir it magnetically, then add dimethylformamide solution, ammonium hydroxide solution and hydrazine hydrate solution in sequence, and continue magnetic stirring to carry out redox reaction of GO , to obtain the AgNWs / RGO composite material solution;

[0049] S3) cooling, filtering and drying the composite material solution prepared in step S2 to obtain the AgNWs / RGO composite material.

[0050] Further, in step S2, the concentration of...

Embodiment 1

[0064] A preparation method for a flexible strain sensor, comprising the steps of:

[0065] (1) Disperse 50g of unreduced graphite oxide GO into 25ml of dimethylformamide DMF (≥99.5%) solution, place it in a water-bath sonicator for 15min until GO is completely dispersed, and the ultrasonic frequency is 40KHz. into a GO suspension with a concentration of 2.0mg / mL;

[0066] (2) Add 50ml, 10mg / ml silver nanowire AgNWs solution to the above GO suspension and stir it magnetically for 5min, then add 30mL dimethylformamide DMF solution, 3mL ammonium hydroxide solution (NH3·H2O, 25 %) and 0.5mL hydrazine hydrate (N2H4•H2O, 80%) solution, and continued magnetic stirring at 90°C for 20min to perform redox reaction on GO to obtain AgNWs / RGO composite material solution;

[0067] (3) Cool to room temperature, use a vacuum filter to filter the above AgNWs / RGO composite material solution through a microporous filter membrane with a pore size of 220 nm, and then place the vacuum filtered pr...

Embodiment 2

[0074] A preparation method for a flexible strain sensor, comprising the steps of:

[0075] (1) Disperse 50g of unreduced graphite oxide GO into 25ml of dimethylformamide DMF (≥99.5%) solution, place it in a water-bath sonicator for 10min until GO is completely dispersed, and the ultrasonic frequency is 40KHz. into a GO suspension with a concentration of 2.0mg / mL;

[0076] (2) Add 50ml, 8mg / ml silver nanowire AgNWs solution to the above GO suspension and stir it magnetically for 5min, then add 30mL dimethylformamide DMF solution, 3mL ammonium hydroxide solution (NH3•H2O, 25 %) and 0.5mL hydrazine hydrate (N2H4•H2O, 80%) solution, and continued magnetic stirring at 90°C for 20min to perform redox reaction on GO to obtain AgNWs / RGO composite material solution;

[0077] (3) Cool to room temperature, use a vacuum filter to filter the above AgNWs / RGO composite material solution through a microporous filter membrane with a pore size of 220 nm, and then place the vacuum filtered pro...

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Abstract

The present invention provides a flexible strain sensor and a preparation method thereof, and an application of a flexible strain sensor. The flexible strain sensor comprises strain induction materials, an electrode and an insulated flexible package layer, the strain induction materials are electrically connected with the electrode, the strain induction materials and the electrode are packaged bythe flexible package layer, the end portion of the electrode is led to the external portion of the flexible package layer, and the strain induction materials comprise composite materials AgNWs / RGO including reduced graphene oxide and silver nanowires. The reduced graphene oxide (RGO) with low cost and the silver nanowire (AgNWs) with high conductivity are employed to obtain strain induction composite materials AgNWs / RGO with ultra-high conductivity; the flexible polymer is employed to perform package of the composite materials AgNWs / RGO, the durability is high, and the bending sensitivity is good; and moreover, the composite materials AgNWs / RGO can be cut to prepare high-sensitivity flexible strain sensors with different shapes and sizes, and the high-sensitivity flexible strain sensors can be flexibly and conveniently attached to the surfaces of various morphologies, the quality is light, and the environmental suitability is high.

Description

technical field [0001] The invention relates to a composite material and its application in the field of sensors, in particular to a flexible strain sensor and its preparation method and application, belonging to the field of sensors. Background technique [0002] With the development of transparent, flexible and strain-sensitive sensors, there is a growing demand for real-time medical monitoring, biointegrated therapy, wearable displays, and lightweight mobile electronics. In contrast to rigid supports such as glass or silicon wafers, flexible electronics are built on flexible polymers such as polyethylene terephthalate PET, polyethyleneimine PEI or polydimethylsiloxane PDMS Due to the elasticity of this flexible polymer, the electronic components on the flexible polymer substrate can be bent and uniformly stretched, which can be widely used in deformable touch screens, biometric devices, wearable supercapacitors or solar energy battery etc. [0003] Traditional strain se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16A61B5/024A61B5/02
CPCA61B5/02A61B5/024G01B7/18
Inventor 徐荣青叶亚龙韩永琪曹姝清陈启山
Owner NANJING UNIV OF POSTS & TELECOMM