Three-dimensional graphene foam flexible strain sensor and its preparation method

Abstract

The invention discloses a three-dimensional graphene foam flexible strain sensor and a preparation method thereof. The three-dimensional graphene foam flexible strain sensor comprises three-dimensional graphene foam; the two ends of the three-dimensional graphene foam are coated with conductive colloid; electrodes are arranged in the center of the upper surfaces of the conductive colloid, and cured high-molecular polymers are arranged on the peripheries of the three-dimensional graphene foam and the conductive colloid. According to the preparation method of the three-dimensional graphene foamflexible strain sensor, graphene is attached to a polymer template, and the three-dimensional graphene foam flexible strain sensor based on the polymer template is prepared after permeation of a high-molecular polymer material. The sensor disclosed by the invention has the advantages of high strain capacity, high sensitivity, flexibility, low cost, simple preparation method and good repeatabilityand consistency.

Description

technical field [0001] The invention belongs to the technical field of flexible electronics, in particular to a three-dimensional graphene foam flexible strain sensor and a preparation method thereof. Background technique [0002] A strain sensor is an electronic device that converts mechanical deformation into an electrical signal. Strain sensors have broad application prospects in areas such as human motion detection, health diagnosis, smart clothing, and electronic skin. Usually, traditional strain sensors are based on thin metal sheets or semiconductors, which have poor stretchability of less than 5%, which limits the application range of traditional strain sensors. The flexible strain sensor has greater ductility, good conductivity, good repeatability and durability, overcomes the shortcomings of traditional strain sensors with poor stretchability, and can meet the urgent needs of large strain measurement in the above-mentioned fields . Among them, graphene has becom...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a three-dimensional graphene foam flexible strain sensor, which solves the problem that the sensor in the prior art cannot realize the measurement of large strain

[0009] Another object of the present invention is to provide a method for preparing a three-dimensional graphene foam flexible strain sensor, which solves the problems of high cost, complicated preparation process, and easy fracture of the metal template in the graphene foam prepared by CVD in the prior art; based on the freeze-drying method The prepared sensor has the problems that the graphene foam is easily damaged and the manufacturing process is complicated

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