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High-sensitivity graphene flexible strain transducer and preparation method thereof

A strain sensor and high-sensitivity technology, which is applied in the field of material science, can solve problems such as high cost and unstable product performance, and achieve the effects of guaranteed fit, good conductivity, and good skin-friendliness

Active Publication Date: 2018-11-23
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main preparation methods of graphene are mechanical method, CVD method and redox method, but there are problems of relatively high cost and unstable product performance.

Method used

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  • High-sensitivity graphene flexible strain transducer and preparation method thereof
  • High-sensitivity graphene flexible strain transducer and preparation method thereof
  • High-sensitivity graphene flexible strain transducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A high-sensitivity graphene flexible strain sensor, which is a flexible substrate f and a protective layer d oppositely arranged, and a sandwich structure of a graphene film a is arranged between the two, specifically comprising:

[0044] Flexible substrate f, the flexible substrate f is a flexible film coated with pressure-sensitive adhesive e on one side of the surface;

[0045] Protective layer d, the protective layer d is a flexible film coated with pressure-sensitive adhesive e on one side; the side of the protective layer d coated with pressure-sensitive adhesive e and the flexible substrate f coated with pressure-sensitive adhesive e One side opposite setting;

[0046] The graphene film a is set between the flexible substrate f and the protective layer d;

[0047] A pair of wires b are arranged at both ends of the graphene film a and fixed with conductive silver paste c.

[0048]The flexible film is a polyurethane film or a silicone film, the thickness of the f...

Embodiment 2

[0069] A kind of high-sensitivity graphene flexible strain sensor, its structure is the same as embodiment 1.

[0070] A preparation method for a high-sensitivity graphene flexible strain sensor, comprising the following steps:

[0071] Step 1: Preparation of graphene film

[0072] (1) Graphene flakes are put into the mold and pre-pressed, so that the graphene flakes are evenly dispersed, and the pre-pressed graphene flakes are obtained;

[0073] Described graphene sheet, its thickness is 2nm, is made of 3 layers of single-layer graphene, and its electric conductivity 1300S / cm;

[0074] The process conditions of the pre-pressing are: the pressure is 1200Pa, and the time is 12 seconds;

[0075] (2) adopt tablet press to carry out tableting to the pre-pressed graphene sheet, obtain graphene film; Wherein, the pressure of tabletting is 3MPa, and holding time is 30s, and the thickness of graphene film is 0.04mm;

[0076] Step 2:

[0077] (1) using a roller to evenly coat the s...

Embodiment 3

[0081] A kind of high-sensitivity graphene flexible strain sensor, its structure is the same as embodiment 1.

[0082] A preparation method for a high-sensitivity graphene flexible strain sensor, comprising the following steps:

[0083] Step 1: Preparation of graphene film

[0084] (1) Graphene flakes are put into a mold and pre-pressed, so that the graphene flakes are uniformly dispersed, and the graphene flakes obtained after pre-pressing are obtained; Composition, its conductivity is 1600S / cm;

[0085] The process conditions of the pre-pressing are: the pressure is 1300Pa, and the time is 10 seconds;

[0086] (2) adopt tablet press to carry out tableting to the pre-pressed graphene sheet, obtain graphene film; Wherein, the pressure of tabletting is 1MPa, and holding time is 90s, and the thickness of graphene film is 0.2mm;

[0087] Step 2:

[0088] (1) using a roller to evenly coat the surface of one side of the flexible film with a pressure-sensitive adhesive as the fl...

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Abstract

The invention discloses a high-sensitivity graphene flexible strain transducer and a preparation method thereof, and belongs to the field of material science. The high-sensitivity graphene flexible strain transducer is a sandwich structure in which a flexible base material and a protection layer are arranged oppositely, and a graphene film is arranged at the middle. The preparation method comprises the following steps: pre-pressing and tabletting a graphene sheet to obtain a graphene film; uniformly coating one side surface of a flexible film with a pressure-sensitive adhesive as a flexible base material; putting the graphene film above the flexible base material on the side coated with the pressure-sensitive adhesive, and bonding; putting a pair of wires at two ends of the graphene film,and curing with conductive silver paste; covering the laminated graphene film with the side coated with the pressure-sensitive adhesive of the protection layer, and pressing for bonding. The preparedhigh-sensitivity graphene flexible strain transducer can realize high-sensitivity strain monitoring and has good skin friendliness with human body, and thus is very suitable to be used as human motionmonitoring sensor and wearable equipment.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to a high-sensitivity graphene flexible strain sensor and a preparation method thereof. Background technique [0002] In the past two decades, strain sensors have been widely used in aerospace, automotive, construction, biomedicine and other fields. Due to its ability to accurately detect mechanical deformation or structural changes, it is well suited for stress, strain and damage measurements, structural health monitoring (SHM), material fatigue testing and wearable devices. The strain sensor is mainly based on piezoresistive theory, and its sensitive unit can convert mechanical deformation into resistance change. The sensitive elements of traditional strain sensors mainly use rigid materials (such as metal thin films), and impressive progress has been made, but metal materials are limited by stiffness, which determines that they are not suitable for detecting large-scale...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B27/06B32B27/40B32B37/10B32B7/12A61B5/02A61B5/11
CPCA61B5/02A61B5/1126B32B7/12B32B9/007B32B9/04B32B9/045B32B27/06B32B27/40B32B37/10
Inventor 孟庆实刘志文韩森森赵钰张硕程于音卢少微
Owner SHENYANG AEROSPACE UNIVERSITY
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