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Highly-stretchable 3D printed graphene-based flexible sensor with high sensitivity and preparation method of graphene-based flexible sensor

An alkenyl-based flexible, 3D printing technology, which is used in electric/magnetic solid deformation measurement, electromagnetic measurement devices, additive processing, etc., can solve the problem that flexible sensors cannot obtain high sensitivity coefficient and high strain sensing range at the same time. Sensitivity, excellent comprehensive performance and simple operation

Active Publication Date: 2018-11-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the contradiction that existing flexible sensors cannot obtain high sensitivity coefficient and high strain sensing range at the same time, in order to meet the requirements of flexible sensors in the fields of smart medical care, health monitoring, human-computer interaction, etc. The larger strain sensing range and higher Monitoring Accuracy Needs

Method used

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  • Highly-stretchable 3D printed graphene-based flexible sensor with high sensitivity and preparation method of graphene-based flexible sensor
  • Highly-stretchable 3D printed graphene-based flexible sensor with high sensitivity and preparation method of graphene-based flexible sensor
  • Highly-stretchable 3D printed graphene-based flexible sensor with high sensitivity and preparation method of graphene-based flexible sensor

Examples

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Effect test

Embodiment 1

[0029] Mix 100 parts (the said parts are parts by mass) of the main agent of PDMS with different parts of graphene in ethyl acetate solvent, add 10 parts of PDMS curing agent to the system after evaporating the solvent, figure 2 The modulus of the PDMS / graphene 3D printing material with different graphene addition ratios prepared according to the method in Example 1 of the present invention is shown as a function of shear stress; the above mixed material is used for 3D printing to form a corrugated network three-dimensional structure . Place the printed three-dimensional structure in an oven at 80°C to cure for 6 hours, then place the cured three-dimensional structure in oxygen plasma for 2 minutes, and further immerse the material in 2.5 mg / ml PEI solution for 10 minutes, take out After drying, immerse the material in 3 mg / ml GO solution for 10 minutes, take it out for drying and cleaning, place the material in HI acid solution at 60°C for 30 minutes, take it out and clean i...

Embodiment 2

[0031] Mix 100 parts (the parts are parts by mass) of TPU with 10 parts of carbon black and 5 parts of carbon nanotubes in a tetrahydrofuran solvent, and obtain a 3D printed material after evaporating the solvent. Use the above mixed materials for 3D printing to form a corrugated network three-dimensional structure. Place the printed three-dimensional structure in deionized water for 1 hour, then dry it in a 60°C oven for 2 hours, and then place the three-dimensional structure in oxygen plasma for 2 minutes. , further immerse the material in a 3.5 mg / ml PDDA solution for 10 minutes, take it out and dry it, then immerse the material in a 3 mg / ml GO solution for 10 minutes, take it out, dry it and wash it, then place the material in a HI acid solution at 95°C After reducing for 30 minutes, take it out and clean it, connect it to the electrode, and use n-hexane diluted PDMS solution to impregnate and encapsulate the above materials to prepare a flexible sensor. The sensitivity fa...

Embodiment 3

[0033] Mix 100 parts (the stated parts are parts by mass) of Agent A of Ecoflex silicone rubber with 20 parts of graphene in xylene solvent, and after evaporating the solvent, add 100 parts of Agent B of Ecoflex silicone rubber to the system and mix Uniform, use the above mixed materials for 3D printing to form a corrugated network three-dimensional structure. Place the printed three-dimensional structure in an oven at 80°C to cure for 6 hours, then place the cured three-dimensional structure in oxygen plasma for 2 minutes, and further immerse the material in a 3 mg / ml PDMA solution for 10 minutes, take out After drying, immerse the material in 3 mg / ml GO solution for 10 minutes, take it out, dry and clean it, place the material in HI acid solution at 95°C for 30 minutes, take it out and clean it, connect it to the electrode, and use n-hexane diluted PDMS solution to impregnate and package The above materials are used to prepare flexible sensors. The 3D printed grid-structure...

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Abstract

The invention relates to a highly-stretchable 3D printed graphene-based flexible sensor with high sensitivity and a preparation method of the graphene-based flexible sensor. The graphene-based flexible sensor has two stages of sensing structures, wherein a first-stage sensing structure is formed by filling an elastomer composite with conductive filler, a second-stage sensing structure is formed bycoating the surface of the first-stage sensing structure with graphene, finally, the sensing material is encapsulated after being led out of an electrode, and the flexible sensor is formed. The controllable design of macroscopic shape of the first-stage sensing structure is realized with a 3D printing technology, the highly stretchable characteristic of the sensor is realized by means of construction of a macroscopic grid filling structure, and meanwhile, sensitivity of the sensor in a wide strain range is greatly improved by the two stages of sensing structures. The method is simple to operate, and the prepared graphene-based flexible sensor has high sensitivity and the highly stretchable characteristic, and has potential of being widely applied to the fields of medical wisdom, health monitoring, man-machine interaction and the like.

Description

technical field [0001] The invention relates to a flexible strain sensor and a preparation method thereof, in particular to a graphene-based flexible sensor having both a high sensitivity coefficient and a high strain sensing range, and belongs to the field of flexible and wearable electronics and the technical field of composite materials. Background technique [0002] In recent years, with the introduction of concepts such as smart medical care, health monitoring, and human-computer interaction, the market has put forward higher requirements for flexible and wearable electronic devices, and the performance of flexible sensors, which are the core components of wearable devices, determines the final device. and the key to product performance. Generally speaking, flexible sensors can output the detected material deformation in the form of electrical signals (such as changes in resistance R value), and then respond to different human physiological activities (such as breathing...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L75/04C08K3/04C08J7/12C08J7/14B33Y70/00G01B7/16
CPCB33Y70/00C08J7/12C08J7/123C08J7/14C08J2375/04C08J2383/04C08K3/04C08K3/042G01B7/16G01B7/18C08L83/04C08L75/04
Inventor 卢红斌马建华王鹏阮英波赵晓莉
Owner FUDAN UNIV
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