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A large deformation flexible strain sensor and its preparation method

A strain sensor and large deformation technology, applied in the field of sensors, can solve the problems of low sensitivity coefficient, easily damaged structure, unfavorable mass production, etc., achieve high sensitivity, ensure repeatability and reliability, and uniform large-area mass production Effect

Active Publication Date: 2019-10-18
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measurement range of this highly sensitive strain sensor is limited, and it is damaged or broken under large strain conditions, which limits its application in aerospace, intelligent transportation and other fields.
For example, Chinese patent applications (application number 201610101825.1) "a metal film flexible strain sensor and its preparation method" and (application number 201510259874.3) "a graphene flexible sensor and its manufacturing method", due to the limitation of sensitive materials, The structure used is easily damaged, the deformation range is small, generally less than 10%, and only small deformation or vibration can be detected
On the other hand, sensors that can detect large strains have low sensitivity coefficients when testing weak strains, making it difficult to achieve accurate detection
In addition, the preparation process of the existing flexible strain sensor is complicated, which increases the cost and is not conducive to mass production

Method used

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preparation example Construction

[0033] The present invention also provides a preparation method of the large deformation flexible strain sensor, which includes:

[0034] Step 1: Prepare graphene porous membrane material. First, prepare a surfactant aqueous solution with a mass fraction of 0.5%-5%, and stir it at a speed of 200-2000r / min for 1-3min, and take the upper foam aggregate after standing still for 5-10min; add graphite oxide to the foam aggregate Graphene solution and uniformly stirred at a speed of 200-2000r / min for 1-3min, wherein the concentration of graphene oxide solution is 3-6mg / mL, and the mass volume ratio of foam aggregates to added graphene oxide solution is 1:8-40 , unit g / ml; use the scraper method to coat the foam aggregates containing graphene oxide on a hydrophilic glass sheet with a thickness of 400-1000 μm, and freeze-dry to form a graphene oxide porous membrane material; peel off the sample , and perform annealing and reduction at 350-600° C. under a protective atmosphere to obta...

specific Embodiment

[0038]In step 1, the sensitive material layer is prepared by the soft template method, the template is a surfactant foam aggregate, the pore size can be controlled by adjusting the stirring speed when preparing the foam, and the pore wall thickness can be controlled by adjusting the content of the added precursor. Preferably, the sensitive material can be prepared by the following steps: first, prepare a 1% (mass fraction) aqueous solution of F127 and stir it at 2000r / min for 1min, and take the upper foam aggregate after standing still for 5min; then add 5mL to the 250mg aggregate Graphene oxide solution with a concentration of 4.5 mg / mL was stirred at a speed of 200 r / min for 3 min; the graphene oxide foam aggregate was coated on a hydrophilic glass sheet with a scraper method, and the thickness was 1000 μm, and the porous film was frozen. Drying; peel off the sample, and perform annealing and reduction at 450°C under an argon protective atmosphere to obtain a graphene porous ...

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Abstract

A large-deformation flexible strain sensor and a preparation method thereof belong to the technical field of sensors. The strain sensor comprises a sensitive material layer, a flexible support layer, and electrodes. The sensitive material layer adopts a graphene porous membrane material, and the flexible support layer is distributed in the upper surface, low surface and holes of the graphene porous membrane material. The flexible support layer is used for coating the sensitive material layer and the electrodes and providing elastic deformation of the device under stress. As the sensitive material of the invention is a graphene porous membrane material which has a very thin hole wall and can produce cracks under small strain, the resistance changes quickly, and high sensitivity is achieved. On the other hand, the porous structure provides more conductive paths, which can ensure that the sensor can work normally under large strain. According to the preparation method provided by the invention, graphene porous membranes are evenly batch-produced in a large area by use of a scraper coating method, which can reduce the production cost and ensure the repeatability and reliability of the sensor device.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a large deformation flexible strain sensor and a preparation method thereof. Background technique [0002] Compared with traditional hard substrate sensors, flexible sensors have good elasticity and ductility, and can be used in fields with curved surfaces and complex structures, and have great applications in human motion monitoring, industrial control, intelligent electronics, aerospace and other fields need. In recent years, technicians in the sensor field have explored the preparation of a variety of flexible strain sensors in response to this demand, mainly by attaching conductive stress-sensitive materials to flexible polymer substrates, and monitoring the strain behavior through the resistance change of the device during the flexible strain process. . [0003] As far as the current research is concerned, on the one hand, researchers are committed to preparing highly sens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
Inventor 朱宏伟张儒静
Owner TSINGHUA UNIV
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