Bifunctional Fluorinated Iron-MOF Incorporated PVDF-HFP Nanofibrous Mat-Based High-Performance Triboelectric Nanogenerators for Self-Powered Biomotion and Respiration Monitoring

Abstract

The triboelectric performance of ferroelectric fluoropolymers is intrinsically governed by interfacial polarization and electroactive β-phase, which collectively enhance dielectric properties, charge retention ability, and surface charge density. Herein, this work reports the first development of a bifunctional nanofibrous mat by incorporating fluorinated iron-metal-organic framework (Iron-MOF) into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers, simultaneously promoting electroactive β-phase and charge retention through a facile one-step self-assembly electrospinning strategy, enabling a high-performance wearable triboelectric nanogenerator. Fluorinated Iron-MOF functions as an efficient nucleating and charge-modulating agent, inducing strong hydrogen bonding and interfacial polarization between MOF-polymer (–CF₂–CH₂–) dipoles. This synergistic strategy promotes uniaxial nanocrystal alignment, achieves a significantly improved β-phase fraction of 97.48%, and enhances the dielectric constant by 205.88%. Owing to its bifunctionalities, the surface potential and charge-retention efficiency of composite nanofibers increased 2.5- and 9.5-fold, respectively. Leveraging these advancements, a bifunctional nanofibrous-based triboelectric nanogenerator (BNFs-TENG) delivered outstanding electrical output (684 V, 26.2 μA, and 2.1 W m⁻²), outperforming state-of-the-art MOF-based TENGs. Furthermore, BNFs-TENG served as a self-powered wearable smart band, delivering remarkable pressure sensitivity (5.41 V kPa⁻¹, 0.25–5 kPa), enabling intelligent respiratory rehabilitation progress, and real-time monitoring of respiratory behaviour and physical activity. This work establishes a versatile fluorinated MOF-fluoropolymer interfacial engineering strategy that achieves superior device performance and next-generation self-powered wearable healthcare technologies.

Graphical Abstract

Keywords

Fluorinated Iron-MOF / F-Iron-MOF@PVDF-HFP nanofiber / Electroactive β-phase / Triboelectric nanogenerator / Biomotion and respiration monitoring

References

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Funding

Ministry of Trade, Industry and Energy(RS-2022-00154983)

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Donghua University, Shanghai, China

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