Cobweb-shaped flexible strain sensor capable of identifying strain direction and preparation method thereof

Abstract

The invention discloses a cobweb-shaped flexible strain sensor capable of identifying a strain direction and a preparation method. The method comprises the following steps of mixing a conductive filler, a hot-melt adhesive and an N, N-dimethylformamide solvent, and carrying out ultrasonic dispersion to obtain a dispersion liquid, putting the granular thermoplastic polymer into a screw extruder, and extruding a pure thermoplastic polymer wire, drawing the wire material to pass through the dispersion liquid at a constant speed by utilizing a wire winding roller traction device, forming a uniformand thin conductive layer on the surface of the wire material, and printing the wire material into a cobweb-shaped array by utilizing a 3D printer after the wire material is completely dried, and fixing the wire at the center of the cobweb and the tail end of the longitudinal wire by using conductive silver adhesive to prepare the cobweb-shaped flexible strain sensor. The cobweb-shaped customizedstructure is rapidly prepared, and the sensor also has the function of identifying the strain direction, has the advantages of high linearity, high sensitivity, wide strain range, rapid response, lowhysteresis, good stability and the like, and has great potential in the application of wearable equipment.

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...

AI Technical Summary

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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