Preparation method of high-sensitivity flexible strain sensor

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...

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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 factor of the sensor can reach 3390.06, but its maximum strain is only 65%.

[0003] The flexible sensor in the prior art has a small strain range and poor sensitivity. It can be seen from the above patents that it is difficult for the flexible sensor to combine high sensitivity and high strain, which greatly limits the further development and practical application of the flexible sensor.

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