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Flexible stress sensor with composite microstructure and preparation method thereof

A stress sensor and composite microstructure technology, applied in the field of sensors, to achieve the effects of excellent comprehensive performance, large stretching range and high sensitivity

Inactive Publication Date: 2019-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the defect that the stretchable range and the sensitivity of the flexible stress sensor in the prior art cannot be combined, and the elastic rope with a textile fiber structure on the surface is used as the base, and the composite one-dimensional conductive nanomaterial is prepared by ultrasonic mixing method as the sensor. The sensing material is adhered to the surface of the elastic rope base, so that the sensor has a large stretchable range and good stability

Method used

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  • Flexible stress sensor with composite microstructure and preparation method thereof
  • Flexible stress sensor with composite microstructure and preparation method thereof
  • Flexible stress sensor with composite microstructure and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0028] The schematic diagram of the preparation process of this embodiment is as follows figure 1 as shown,

[0029] 1) Weigh 1.33 mg of multi-walled carbon nanotubes (Multi-walled carbon nanotubes, MWCNTs) powder into a test tube, add 4 mL of silver nanowires (Ag nanowires, Ag NWs)-isopropanol suspension with a concentration of 10 mg / mL, The mass ratio of MWCNTs and Ag NWs was 1:30, and the suspension of the two was stirred for 5 min and then ultrasonically dispersed for 2 h to obtain a more uniformly dispersed MWCNTs-Ag NWs hybrid material. Note that the mixture should be stirred for 5 minutes every 30 minutes of ultrasonic dispersion to ensure that MWCNTs and Ag NWs can be more uniformly dispersed;

[0030] 2) The elastic rope whose surface is cotton textile fiber is cut into a small section with a length of 20 mm, cleaned with ethanol and deionized water, and cleaned with N 2 Blow dry, then immerse in the suspension of the MWCNTs-Ag NWs hybrid material prepared in 1), ul...

Embodiment 2

[0036] 1) Weigh 1.60mg of carbon nanofiber powder into a test tube, add 5mL of copper nanowires (Cuanowires, Cu NWs)-isopropanol suspension with a concentration of 10mg / mL, stir the suspension of the two for 5min and then ultrasonically disperse for 2h , to obtain a more uniformly dispersed carbon nanofiber-Cu NWs hybrid material. Note that the mixture should be stirred for 5 minutes every 30 minutes of ultrasonic dispersion to ensure that the carbon nanofibers and Cu NWs can be more uniformly dispersed;

[0037] 2) the surface is that the elastic rope of nylon textile fiber is cut into the segment that length is 30mm, cleans up with ethanol and deionized water, uses N 2 Blow dry, and then immerse in the suspension of the carbon nanofiber-Cu NWs hybrid material prepared in 1), ultrasonic 2h makes the carbon nanofiber-Cu NWs hybrid material more evenly adhere to the nylon fiber surface of the outer layer of the elastic rope;

[0038] 3) Take out the elastic rope, put it in the...

Embodiment 3

[0040]1) Weigh 2.0mg of carbon nanofiber powder into a test tube, add 5mL of gold nanowires (Aunanowires, Au NWs)-isopropanol suspension with a concentration of 20mg / mL, stir the suspension of the two for 5min and then ultrasonically disperse for 2h , to obtain a more uniformly dispersed carbon nanofiber-Au NWs hybrid material. Note that the mixture should be stirred for 5 minutes every 30 minutes of ultrasonic dispersion to ensure that the carbon nanofibers and Cu NWs can be more uniformly dispersed;

[0041] 2) the surface is that the elastic rope of nylon textile fiber is cut into the segment that length is 30mm, cleans up with ethanol and deionized water, uses N 2 Blow dry, and then immerse in the suspension of the carbon nanofiber-Cu NWs hybrid material prepared in 1), ultrasonic 2h makes the carbon nanofiber-Cu NWs hybrid material more evenly adhere to the nylon fiber surface of the outer layer of the elastic rope;

[0042] 3) Take out the elastic rope, put it in the ai...

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Abstract

The invention discloses a flexible stress sensor with a composite microstructure and a preparation method thereof, and belongs to the field of sensors. The method comprises the following steps: two one-dimensional nanomaterials are dispersed in solvents such as ethanol and isopropyl alcohol and stirred and then ultrasonically performed for half an hour, and the process is repeated until the nanomaterials are uniformly dispersed; step 2, an elastic rope is immersed into the dispersion liquid of the conductive nanomaterial of the step 1 and stirred and then ultrasonically performed for 2 hours so that the conductive nanomaterial can adhere to the textile fiber on the surface of the elastic rope sufficiently; and step 3, the elastic rope is taken out to be dried in the air and a metal wire isrespectively connected on the two ends of the elastic rope as a lead-out electrode. The characteristics of large stretchable range, good stability, high sensitivity and rapid response of one-dimensional conductive nanometer material of the textile microstructure substrate are integrated, and the prepared flexible stress sensor has excellent comprehensive performance and high sensitivity and highstretchability.

Description

technical field [0001] The invention belongs to the field of sensors, and relates to a flexible stress sensor with composite microstructure and a preparation method thereof. Background technique [0002] Due to the characteristics of rigidity, small measuring range and low sensitivity of traditional stress sensors, the application range is greatly limited, and the room for further improvement is becoming smaller and smaller. Flexible stress sensors have the characteristics of wearable, high performance, low cost, low power consumption, large measurement range, good biocompatibility, light weight and portability. Broad application potential and development prospects [0003] However, there is a contradictory relationship between high sensitivity and high stretch range in most stress sensors. For example, flexible stress sensors based on metal nanoparticles have high sensitivity but rather low stretchable range, while those based on carbon nanotubes have high stretchable ran...

Claims

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Application Information

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IPC IPC(8): G01L1/22B82Y15/00B82Y30/00
CPCG01L1/22B82Y15/00B82Y30/00
Inventor 李爱东赖天成曹燕强吴迪
Owner NANJING UNIV
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