Organic piezoelectric composite material and preparation and application thereof

Abstract

The invention discloses an organic piezoelectric composite material as well as preparation and application thereof, and the material is prepared by mixing an electron-deficient acceptor azafluorene derivative a: 9-(dicyanomethylene)-9H-indeno [1, 2-b] pyrazine-2, 3-dicarbonitrile and an electron-rich donor derivative b: 7H-dibenzo [c, g] carbazole. The whole preparation process is simple, and quantitative production is easy to realize. According to the horizontal electrode piezoelectric device prepared on the basis of the organic piezoelectric composite material, the piezoelectric output voltage reaches about 200mV, and the short-circuit current reaches about 5nA; the self-powered piezoelectric-triboelectricity composite device obtained by compounding with PDMS can effectively sense external pressure and effectively convert mechanical energy into electric energy, the triboelectricity output voltage reaches about 60 V, and the short-circuit current is about 1.5 microamperes.

Description

technical field [0001] The invention belongs to the technical field of organic piezoelectric materials, and in particular relates to an organic piezoelectric composite material and its preparation and application. Background technique [0002] The piezoelectric effect is a phenomenon in which the dielectric body deforms under the action of mechanical force, which causes the relative displacement of the positive and negative charge centers inside the dielectric body to cause polarization, and accumulates bound charges with opposite signs on the surface of the crystal electrode. This phenomenon of converting mechanical energy into electrical energy is called the positive piezoelectric effect. Conversely, the phenomenon of converting electrical energy into mechanical energy is called the inverse piezoelectric effect. If a centrosymmetric dielectric is subjected to pressure, the interior of the dielectric deforms uniformly. At this time, the external force cannot destroy the c...

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Problems solved by technology

[0006] Chinese patent CN112724090A discloses an electron-deficient azafluorene organic heterojunction material and its preparation method and application. The disclosed material includes two active components, namely electron-deficient azafluorene derivatives and electron-rich conjugated aromatic hydrocarbons Compounds, the disclosed general formula includes a large protection range, but combined with the content of the examples, only the composite objects under some structures have excellent carrier transport performance, and have high on-off ratio, conductivity Well, the advantages of high quantum efficiency and photoelectric conversion efficiency can be used as organic heterojunction materials, which broaden the application range of electron-deficient azafluorene-based organic heterojunction materials to a certain extent, but there are few electron-deficient azafluorene-based organic heterojunction materials. Public reports on the combination of azafluorene compounds and electron-rich donor derivatives for application in the field of piezoelectric-triboelectric materials, thus further in-depth design and research of new electron-deficient azafluorene derivatives and electron-rich donors The organic composite piezoelectric materials combined with derivatives still have important application value, and it is expected to further expand the application range of such materials, and also provide new research ideas for the research and development of new organic functional materials

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