Modified PVDF nanofiber piezoelectric sensing film and preparation method and application thereof

A flexible, self-powered sensor was fabricated using a modified PVDF nanofiber piezoelectric sensing membrane and electrospinning technology. This solved the problem of real-time damage monitoring of FRP structures, achieving high-sensitivity and self-powered damage localization, and is suitable for structural health monitoring of composite materials.

CN122406459APending Publication Date: 2026-07-17NANJING TECH UNIV
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Patent Information

Application Number
CN202610376340.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-25
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Traditional fiber-reinforced polymer composites (FRPs) suffer from poor impact resistance and low damage tolerance in damage detection. Furthermore, existing embedded sensors may compromise structural integrity or require external power, making it difficult to achieve real-time and accurate damage monitoring.

Method used

A modified PVDF nanofiber piezoelectric sensing membrane was prepared by using a composite spinning solution modified with hydroxylated barium titanate and multi-walled carbon nanotubes. The membrane was then prepared by electrospinning and hot-pressed with glass fiber prepreg to form a self-powered embedded sensing unit. Damage monitoring was achieved by combining this unit with electrical impedance tomography (EIT) technology.

Benefits of technology

It enables real-time, in-situ, and visualized damage monitoring of FRP structures, improves sensing sensitivity and signal accuracy, has self-powered characteristics, does not weaken the structural mechanical properties, and is suitable for aerospace, automotive, and marine engineering.

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Abstract

The invention discloses a modified PVDF (Polyvinylidene Fluoride) nanofiber piezoelectric sensing film as well as a preparation method and application thereof, and belongs to the technical field of health monitoring of flexible piezoelectric sensing materials and composite material structures. The preparation method comprises the following steps: carrying out hydroxylation modification on barium titanate nanoparticles and multi-walled carbon nanotubes, blending with PVDF-HFP to prepare a spinning solution, and preparing the PVDF-HFP / BaTiO-h / MWCNTs-h composite piezoelectric sensing film through an electrostatic spinning technology. The sensing film is used as an embedded sensing unit, the sensing film and a glass fiber prepreg are integrally formed through a hot pressing process, and the GFRP composite material laminated plate with the built-in self-powered sensing unit is prepared. The prepared modified PVDF nanofiber piezoelectric sensing film is excellent in piezoelectric output performance and good in compatibility with a composite material matrix, the mechanical performance of a laminated plate is not weakened after embedding, on the contrary, tensile strength and modulus are slightly improved, meanwhile, the self-powered PVDF nanofiber piezoelectric sensing film has the self-powered characteristic, and the self-powered PVDF nanofiber piezoelectric sensing film can be widely applied to the field of piezoelectric sensing devices. The method can be widely applied to fiber reinforced composite material structure health monitoring in the fields of aerospace, automobiles, ocean engineering and the like.
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