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Preparation method of graphene/carbon nanotube network flexible multifunctional strain sensor

A technology of strain sensor and carbon nanotube, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of low sensitivity, large gauge coefficient, small detection range, etc., achieve simple preparation process and increase specific surface area , The method is stable and reliable

Active Publication Date: 2019-11-08
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the commonly used active materials, the strain sensor made of one-dimensional fiber material has high stretchability, large detection range, excellent tolerance and stability, but it is not suitable for micro-deformation detection, low sensitivity, strain small coefficient
The strain sensor made of two-dimensional sheet material has high sensitivity, large gauge coefficient, and short response time, but its stretchability is poor, it is not suitable for large deformation detection, and its stability and tolerance are weak
However, the operating conditions of the strain sensor prepared by simple sheet graphene are harsh, the sensor stability is not good, the detection range is small, and the mechanical properties of sheet graphene are not good in the actual environment, so that it cannot be effectively used in practical applications. effect

Method used

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  • Preparation method of graphene/carbon nanotube network flexible multifunctional strain sensor
  • Preparation method of graphene/carbon nanotube network flexible multifunctional strain sensor
  • Preparation method of graphene/carbon nanotube network flexible multifunctional strain sensor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038] (1) Put the nickel foam substrate into a tube furnace, use ethanol as the carbon source, and grow graphene by chemical vapor deposition under normal pressure and 950°C for 10 minutes, then cool to room temperature at a rate of 50°C / min, 3 Mole / liter hydrochloric acid solution etches the nickel foam substrate to obtain a self-supporting three-dimensional graphene network.

[0039](2) Deposit 1 mm thick metal iron nanoparticles on the surface of graphene by electron beam evaporation to obtain a composite material of three-dimensional graphene and metal iron nanoparticles.

[0040] (3) Put the composite material of three-dimensional graphene and metal iron nanoparticles into a tube furnace, and grow carbon nanotubes on the surface of three-dimensional graphene by secondary chemical vapor deposition method under normal pressure and 750°C for 15 minutes, / min rate to cool to room temperature to obtain a three-dimensional graphene / carbon nanotube network.

[0041] (4) Mix di...

Embodiment 2

[0044] (1) Put the nickel foam substrate into a tube furnace, use methane as the carbon source under normal pressure, grow graphene by chemical vapor deposition at 1000°C for 25 minutes, cool to room temperature at a rate of 50°C / min, 3 The nickel foam substrate was etched in mole / liter hydrochloric acid solution to obtain self-supporting three-dimensional graphene.

[0045] (2) Add 0.25 mmol of nickel nitrate hexahydrate, 0.5 mmol of cobalt nitrate hexahydrate and 1.2 mmol of urea into 40 ml of deionized water, stir evenly and transfer them to a 50 ml reactor with three-dimensional graphene, and react at 120°C After 2 hours, wash with deionized water and dry to obtain a composite material of three-dimensional graphene and NiCo nanoparticles.

[0046] (3) Put the three-dimensional graphene and NiCo nanoparticle composite material into a tube furnace, grow carbon nanotubes by secondary chemical vapor deposition for 25 minutes under normal pressure and 750°C, and cool at a rate ...

Embodiment 3

[0051] (1) Put the nickel foam substrate into a tube furnace, use ethanol as the carbon source under normal pressure, grow graphene by chemical vapor deposition at 900°C for 15 minutes, and cool to room temperature at a rate of 50°C / min , the nickel foam substrate was etched in 3 mol / L hydrochloric acid solution to obtain self-supporting three-dimensional graphene.

[0052] (2) Add 0.5 mmol of nickel nitrate hexahydrate, 1 mmol of cobalt nitrate hexahydrate and 2 mmol of urea into 40 ml of deionized water, stir well and transfer them to a 50 ml reaction kettle together with three-dimensional graphene, at 120°C The three-dimensional graphene and NiCo nanoparticle composite material was obtained after reacting for 2 hours.

[0053] (3) Put the three-dimensional graphene and NiCo nanoparticle composite material into a tube furnace, grow carbon nanotubes by secondary chemical vapor deposition for 20 minutes under normal pressure and 750 °C, and cool to room temperature at a rate o...

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Abstract

The invention discloses a three-dimensional graphene / carbon nanotube network flexible multifunctional strain sensor preparation method. According to the invention, the three-dimensional network of three-dimensional graphene and a one-dimensional carbon nanotube grows through two-step chemical vapor deposition; and the three-dimensional network and an elastic polymer as a flexible substrate are solidified and combined to acquire a flexible wearable multifunctional electronic strain sensor based on the three-dimensional network of the graphene and the carbon nanotube. According to the invention, the electronic strain sensor breaks the limitation relationship between the strainability and the sensitivity of the strain sensor, has an excellent electronic strain sensing performance and the function of a micro heater, realizes high sensitivity detection of human physiological signals and physical activities, shows excellent electronic skin simulation capabilities and a micro heating source application performance, has the advantage of simple process, and can be widely used in many fields such as clinical diagnosis, health monitoring, a robot, an electronic screen, electronic skin, a flexible micro heater and intelligent home.

Description

Technical field: [0001] The invention relates to a preparation method of a wearable flexible multifunctional electronic strain sensor based on a three-dimensional graphene / carbon nanotube three-dimensional network material. The obtained electronic strain sensor can be applied to the detection of human physiological signals and physical activities and micro heating sources , which has a wide range of practical application values ​​in many fields such as clinical diagnosis, health monitoring, robots, electronic screens, electronic skin, flexible micro-heating sources, and smart homes. Background technique: [0002] With the rapid development of science and technology and medical level, clinical diagnosis and evaluation of human diseases, health monitoring, virtual electronics, flexible touch screen, human-computer interaction and industrial robots have posed new challenges to electronic strain sensing technology. Traditional strain sensors are mainly based on metal and semicon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
CPCG01B7/16
Inventor 董晓臣蔡依晨黄维
Owner NANJING TECH UNIV
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