Preparation method of high-sensitivity flexible strain sensor

A strain sensor and high-sensitivity technology, applied in the field of flexible sensors, can solve the problems of difficult combination of high sensitivity and high strain, limit the development and application of flexible sensors, and small strain range of flexible sensors, and achieve wide selectivity and good quality stability , the effect of good elasticity

Pending Publication Date: 2019-01-01
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

The patent (CN107726971) discloses a strain sensor. The maximum deformation of the sensor made of carbon nanofiber can reach 400%, but its resistance change is only 60 times of the initial resistance, and the sensitivity is not ideal.
The patent (CN107655398A) discloses a high-sensitivity stretchable flexible strain sensor and its manufacturing method. The maximum sensitivity facto

Method used

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  • Preparation method of high-sensitivity flexible strain sensor
  • Preparation method of high-sensitivity flexible strain sensor
  • Preparation method of high-sensitivity flexible strain sensor

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[0022] Example 1

[0023] Step a: Take 50 mg of aqueous graphene mixed with 50 ml of ethanol with a volume concentration of 98% and ultrasonicate for 10 minutes, then centrifuge at 5000 rpm for 15 minutes, and take the supernatant to obtain the graphene The spreading fluid is ready for use.

[0024] Step b: The PDMS substrate 2 is cleaned and hydrophilized with a plasma cleaner.

[0025] c step: refer to the attached figure 2 , A laser etching machine is used to etch the required shape of the graphene strain layer 3 on the PI tape 1.

[0026] See attached image 3 , Paste the patterned PI tape 1 on the PDMS substrate 2.

[0027] Step d: Pour deionized water into the water tank of the "Langmuir" membrane analyzer as the subphase, use a syringe to spread the graphene spreading solution prepared above drop by drop on the surface of the deionized water, and let it stand for 40 minutes. After the ethanol is completely volatilized, a graphene layer is formed on the surface of the deionized...

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Abstract

The invention discloses a preparation method of a high-sensitivity flexible strain sensor. The preparation method is characterized in that a graphene strain layer is transferred onto a PDMS flexible substrate by using the self-assembly process and then packaged as a top electrode so as to prepare the strain sensor. Compared with the methods in the prior art, more than 300% strain can be realized and the maximum sensitivity factor can reach 4500. The preparation process is simple, the material sensitive to the target quantity of the sensor is wide in selectivity, the raw material is easy to obtain, the production cost is low, and the preparation method can be widely applied to the wearable electronic device of biomedical science.

Description

technical field [0001] The invention relates to the technical field of flexible sensors, in particular to a method for preparing a high-sensitivity flexible strain sensor based on ordered monomolecular layer technology. Background technique [0002] Electronic sensors are generally designed based on solid metal strain gauges, which are poor in portability and wearability. Compared with fragile traditional sensors, flexible sensors have become a new generation due to their good elasticity, stretchability and continuous detection. One of the important development directions of sensors. At present, wearable electronic devices have been widely used in various aspects closely related to human life, such as biomedicine, human activity detection and electronic skin. The patent (CN107726971) discloses a strain sensor. The maximum deformation of the sensor made of carbon nanofiber can reach 400%, but the resistance change is only 60 times of the initial resistance, and the sensitivi...

Claims

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Application Information

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IPC IPC(8): G01B7/16G01L1/22
CPCG01B7/20G01L1/2293
Inventor 吴幸厉泉玲李晔李子凡高源王健生谢琳婧
Owner EAST CHINA NORMAL UNIVERSITY
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