Flexible piezoelectric composite material, flexible electronic skin and preparation method thereof

Abstract

The invention relates to a flexible piezoelectric composite material, flexible electronic skin and a preparation method thereof, and the preparation method of the flexible piezoelectric composite material comprises the following steps: (1) weighing piezoelectric polymer powder and adding the piezoelectric polymer powder into an organic solvent solution, (2) adding two-dimensional lamellar MXene powder into the solution in the step (1), (3) spin-coating the dispersion liquid prepared in the step (2) on a substrate by using a spin coater, (4) putting the spin-coated substrate in the step (3) into a vacuum drying oven for vacuum annealing, and (5) polarizing the film prepared in the step (4) in a high-voltage electric field environment. The preparation method of the flexible electronic skin comprises the following steps: (1) cutting the obtained flexible piezoelectric film into long strips, (2) covering the surface of an object to be measured with each film along the transverse and vertical directions respectively, and finally applying the PVDF-based composite material with high orientation arrangement, high beta phase content, high piezoelectric property and good flexibility to the flexible electronic skin.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a flexible piezoelectric composite material, a flexible electronic skin and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of wearable electronic devices, flexible electronic skin, as the most important part of human-computer interaction, has attracted close attention. Polyvinylidene fluoride (PVDF) and its copolymers have the advantages of flexibility, chemical inertness, piezoelectricity and high sensitivity, so they are considered to be ideal materials for making wearable pressure sensors. As a typical polymorphic polymer, PVDF contains five crystal forms of α, β, γ, δ, and ε, of which only the β and γ phases have piezoelectric properties. The prepared PVDF and its copolymer films Among them, most of the components are α-phase without piezoelectric properties, and the content of β-phase with piezoelectric properties ...

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Problems solved by technology

As a typical polymorphic polymer, PVDF contains five crystal forms of α, β, γ, δ, and ε, of which only the β and γ phases have piezoelectric properties. The prepared PVDF and its copolymer films Among them, most of the components are α-phase without piezoelectric properties, and the content of β-phase with piezoelectric properties is generally low. This phenomenon also limits the application of PVDF and its copolymer films in the field of wearable devices to a certain extent. Therefore, it is an effective method to improve the piezoelectric performance by increasing the components of the β phase in PVDF and its copolymers. At present, in the preparation process of PVDF and its copolymer films, only thermal polarization, electrical Halo polarization, heat treatment, etc. can transform α into β phase to improve its piezoelectric performance, but the effect of such methods is limited

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