A spider web-shaped flexible strain sensor capable of identifying strain direction and its preparation method

Abstract

The invention discloses a spider web-shaped flexible strain sensor capable of identifying the strain direction and a preparation method thereof, comprising the following steps: mixing conductive filler, hot-melt adhesive and N,N-dimethylformamide solvent for ultrasonic dispersion to obtain dispersion Put the granular thermoplastic polymer into the screw extruder to extrude the pure thermoplastic polymer filament; use the winding roller traction device to pull the filament through the dispersion at a uniform speed, forming a uniform thin conductive layer on its surface , after being completely dried, use a 3D printer to print the silk into a spider web-shaped array; fix the wires on the center of the spider web and the ends of the longitudinal wires with conductive silver glue to make a spider web-shaped flexible strain sensor. The invention not only quickly prepares a spider web-shaped custom structure, but also has the function of identifying the strain direction, and has the advantages of high linearity, high sensitivity, wide strain range, fast response, low hysteresis and good stability. It has great potential in the application of wearable devices.

Description

technical field [0001] The invention relates to a spider web-shaped flexible strain sensor capable of identifying strain directions and a preparation method thereof, belonging to the technical field of flexible strain sensors. Background technique [0002] In recent years, with the development of wearable electronic devices, flexible strain sensors as the core of wearable electronic devices have attracted much attention because of their wide range of applications. Compared with traditional strain sensors, flexible strain sensors have high flexibility, high sensitivity, large strain working range and good biocompatibility, and have great potential in wearable electronics, biomedicine, soft robots and other fields. Therefore, flexible Strain sensors have greater potential market value. The flexible strain sensor is composed of two parts: conductive nanofillers and elastic base materials. The conductive nanofillers include carbon nanotubes, carbon black, graphene, carbon fiber...

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Problems solved by technology

[0003] However, there are some common problems in the traditional preparation methods of flexible strain sensors. For example, the flexible strain sensors produced by traditional preparation methods have a long cycle; when making strain sensors with complex structures, there are many steps and low precision, which makes it impossible to achieve mass production. ; and the production of most strain sensors requires molds, especially for some custom-made structures or strain sensors working in special environments, the development and manufacture of molds greatly limits the economic benefits of industrial production; at the same time, in some flexible strain sensors During the preparation method, substances harmful to the environment will be produced, which will have a negative impact on the protection of the environment

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