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Multi-functional graphene flexible sensor having high resistance strain sensitivity coefficient and high deformation capability and preparation method thereof

A flexible sensor and graphene technology, applied in the field of flexible wearable sensors and their preparation, multifunctional wrinkled graphene flexible sensors, can solve the problems of inability to have both high resistance strain sensitivity coefficient and high strain sensing range, single function, etc. Achieve the effect of high resistance strain sensitivity coefficient, high strain sensing range and low cost

Active Publication Date: 2018-02-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to overcome the problem that the existing flexible wearable sensors cannot have both high resistance strain sensitivity coefficient and high strain sensing range, and the problem of single function, so as to meet the requirements of high resistance strain sensitivity coefficient and high strain sensing range of the sensor that can be worn by the human body. Requirements, realize the induction and detection of various human activities

Method used

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  • Multi-functional graphene flexible sensor having high resistance strain sensitivity coefficient and high deformation capability and preparation method thereof
  • Multi-functional graphene flexible sensor having high resistance strain sensitivity coefficient and high deformation capability and preparation method thereof
  • Multi-functional graphene flexible sensor having high resistance strain sensitivity coefficient and high deformation capability and preparation method thereof

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preparation example Construction

[0056] Preparation of woven mesh graphene film. The woven mesh graphene film can be obtained by depositing and growing on the surface of the woven mesh metal catalyst by CVD chemical vapor deposition and removing the woven mesh metal catalyst, but other methods for obtaining the woven mesh graphene film are not excluded. The woven mesh metal catalyst used in the CVD chemical vapor deposition method may be a metal copper woven mesh or a metal nickel woven mesh or the like. The gas used in the CVD chemical vapor deposition method may be a mixed gas of a carbon source, hydrogen, and argon. The carbon source may be high purity methane gas. The gas inlet rate of the mixed gas may be 40-60 mL / min. The intake time of the carbon source may be 10-30 minutes. The woven mesh metal catalyst is woven from metal fibers (such as metal copper wires or metal nickel wires). The woven mesh metal catalyst is preferably formed by alternately woven metal fibers in the warp and weft directions. ...

Embodiment 1

[0066] The cleaned metal copper braided mesh (100 mesh, wire diameter 100μm, such as figure 1 (Shown) placed in a CVD furnace tube at 1000°C, grown for a certain time (25min) under a mixed gas of methane, hydrogen, and argon (methane 55ml / min) to obtain a copper woven mesh deposited with graphene, such as figure 2 Shown. Further etching to remove the metal copper to obtain a woven mesh graphene. After that, using Dragonskin as a flexible substrate, transfer a layer of woven mesh graphene film and attach it to the surface of the flexible substrate. The angle between the fibers of the woven mesh graphene and the pre-stretching direction is 45°. Finally, silver paste and copper leads are used to set electrodes on both ends of the graphene, and the liquid substrate material is coated on the surface and cured to obtain a flexible sensor.

Embodiment 2

[0068] The cleaned metal copper braided mesh (100 mesh, wire diameter 100μm) is placed in a CVD furnace tube at 1000°C, and grown for a certain time (25min) under a mixed gas of methane, hydrogen, and argon (methane 55ml / min), and further The metal copper is removed by etching to obtain a woven mesh graphene. Afterwards, use Dragon skin as the flexible substrate, pre-stretch the flexible substrate (stretch the length of the flexible substrate to 1.13 times the original length), and transfer a layer of woven mesh graphene film to attach it to the surface of the flexible substrate. Furthermore, completely releasing and restoring the flexible substrate to a relaxed state causes the woven mesh graphene loaded on it to produce a certain degree of wrinkles. Then transfer a layer of woven mesh graphene to obtain a corrugated woven mesh graphene film with 2 layers stacked from top to bottom and closely adhered to each other. The angle between the fibers of the woven mesh graphene and ...

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Abstract

The invention relates to a multi-functional graphene flexible sensor having a high resistance strain sensitivity coefficient and high deformation capability and a preparation method thereof. The graphene flexible sensor comprises a flexible substrate, a sensitive material attached onto the surface of the flexible substrate and electrodes distributed at the two ends of the sensitive material. The sensitive material is at least one layer of pleated braided mesh graphene film; the pleated braided mesh graphene film is braided by graphene fibers, preferably, is braided alternately in longitude andlatitude directions; and the graphene fiber internally has a graphene nano-sheet stack structure. The preparation method is simple to operate and low in cost, and have the potential of being widely applied to fields of daily human body motion sensing, health monitoring, an intelligent robot and man-machine interaction and the like.

Description

Technical field [0001] The invention relates to a flexible wearable sensor and a preparation method thereof, in particular to a multifunctional pleated graphene flexible sensor with high resistance strain sensitivity coefficient and high deformation ability, belonging to the field of flexible and wearable electronics and new material technology field. Background technique [0002] Flexible wearable sensors are a general term for a type of sensors that can be directly worn or integrated into clothing and sense and detect various human physiological and sports activities. They are used in human-computer interaction, intelligent robots, voice recognition, personal health monitoring and sports There are a wide range of applications in induction. Traditional strain sensors are mainly based on some rigid materials, such as metal foils and semiconductors, which have poor stretchability (<5%) and are not wearable [Non-Patent Document 1]. In order to realize the flexible wearability ...

Claims

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Application Information

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IPC IPC(8): G01B7/16C01B32/182
CPCG01B7/18
Inventor 孙静何腾宇王冉冉王焱
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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