Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-sensitivity large-strain flexible strain sensor and preparation method thereof

A strain sensor, high-sensitivity technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problem of difficult balance, no more than 2%, etc., to achieve the effect of improving electrical conductivity, high sensitivity, and increasing effective volume

Active Publication Date: 2021-03-26
NANJING UNIV OF SCI & TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sensitivity and strain sensing range are two contradictory properties. For example, a strain sensor based on graphene film has high sensitivity, but its strain sensing range does not exceed 2%, and another strain sensor based on graphene fiber The strain sensing range of the strain sensor can reach 100%, but its sensitivity coefficient does not exceed 10 (GF=(R-R0) / R0Δε, where R represents the resistance before deformation, R0 represents the resistance after deformation, and Δε represents strain)), it is difficult to Balance performance between sensitivity and strain sensing range

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-sensitivity large-strain flexible strain sensor and preparation method thereof
  • High-sensitivity large-strain flexible strain sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, measure 90 mL of concentrated sulfuric acid and 30 mL of concentrated nitric acid solution, and stir them evenly in a 1000 mL beaker to obtain an acid solution; then weigh 0.2 g of multi-walled carbon nanotubes, and slowly add them to the acidic mixed solution while stirring , after being uniformly dispersed, stir at 60 °C for 4 h; after the reaction, add a large amount of deionized water to dilute the resulting solution, and filter it with a polyvinylidene fluoride membrane. The acidified multi-walled carbon nanotubes can be obtained by drying under vacuum for 48 h; the graphite oxide is prepared by the traditional Hummers method, and then the graphite oxide is placed in water and ultrasonically treated to obtain a monolithically dispersed graphene oxide dispersion, and the The vinylidene fluoride filter membrane was subjected to suction filtration, and after all the suction filtration was completed, the solid was collected and dried in vacuum at 80 °C for 48 h ...

Embodiment 2

[0037] Repeat the method of Example 1 according to the specified components, but in step 1, the mass ratio of concentrated sulfuric acid and concentrated nitric acid is 2:1; in step 2, the ultrasonic power is 50 kHz, and the ultrasonic time is 2 h, and the obtained acidified The concentration of multi-walled carbon nanotubes / graphene oxide suspension was 2 mg / mL; in step 3, the immersion time was 1 h, and the thickness of the obtained multi-walled carbon nanotubes / graphene / carbonized absorbent cotton gauze three-dimensional hybrid network material was 2 nm; in step 4, the elastomer emulsion is styrene-butadiene rubber and natural rubber, the mass ratio is 1:1, the curing temperature is 60 °C, and the curing time is 5 h. The sensitivity index Gaugefactor (GF) of the obtained sensor is about 1375 (0 ε 0 ) / R 0 Δε, where R represents the resistance before deformation, R 0 Indicates the resistance after deformation, and Δε indicates the strain). When the strain is 7.5% and 50%, a...

Embodiment 3

[0039] Repeat the method of Example 1 according to the specified components, but in step 4, the elastomer emulsion is PDMS prepolymer and its curing agent diethylaminomethyltriethoxysilane. The sensitivity index Gaugefactor (GF) of the obtained sensor is about 1285 (0 ε 0 ) / R 0 Δε, where R represents the resistance before deformation, R 0 Indicates the resistance after deformation, and Δε indicates the strain). When the strain is 7.5% and 50%, after repeated 50 times, the sensitivity indexes are 1213 and 7819 respectively.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-sensitivity large-strain flexible strain sensor and a preparation method thereof. The method comprises: firstly preparing acidified multi-walled carbon nanotubes, and then ultrasonically preparing acidified multi-walled carbon nanotube / graphene oxide suspension, then taking absorbent cotton gauze as a template, tightly covering the absorbent cotton gauze with acidified multi-walled carbon nanotube / graphene oxide by using a vacuum extraction process, and preparing by using a gradient temperature variation technology to obtain a multi-walled carbon nanotube / graphene / carbonized absorbent cotton gauze three-dimensional hybrid net-like material, and finally compounding and curing with an elastomer emulsion to obtain the high-sensitivity large-strain flexible strain sensor. According to the high-sensitivity and large-strain flexible strain sensor disclosed by the invention, the conditions of the preparation method are mild, the cost is low, the repeatability ishigh, and the strain sensor has excellent deformation capability, is high in sensitivity and wide in strain range, and is used for wearable electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of strain sensor preparation, and in particular relates to a high-sensitivity and large-strain multi-wall carbon nanotube / graphene / carbonized absorbent cotton gauze / elastomer flexible strain sensor and a preparation method thereof. Background technique [0002] In recent years, flexible and wearable resistive sensors have received extensive attention from researchers. The strain sensor is a sensor made of "strain-resistance effect", which can convert the local deformation strain on the object under test into an intuitive and measurable resistance change, suitable for health monitoring, virtual electronics, flexible touch screen, human-computer interaction and industrial robots. However, as the core of wearable devices, the sensor unit faces many challenges. The sensitivity and signal strength of the existing smart sensing units are generally low. Complex, difficult to form a mature application. Compared w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 贾红兵林炎坤张旭敏章婉琪王晶宋万诚陆少杰李雪雨
Owner NANJING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com