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<p>Flexible CoFe<sub>2</sub>O<sub>4</sub>/polyvinylidene fluoride (CFO/PVDF) composite films were fabricated via a casting technique using CFO particles synthesized hydrothermally with varying holding times. The effects of CFO particle size on phase composition, microstructure, mechanical behavior, and magnetoelectric properties of the films were systematically investigated. The CFO particles were uniformly dispersed within the PVDF matrix. As particle size increased, the composite surface became smoother and more continuous. With a 2&#xa0;h holding time, corresponding to a CFO size of 7.48 × 0.59&#xa0;μm, the film exhibited the highest magnetodielectric coefficient (5.22%) and a magnetoelectric coupling coefficient of − 8.98&#xa0;V/(cm&#xa0;Oe). In contrast, CFO/PVDF-1&#xa0;h films, containing CFO particles sized 5.37 × 0.50&#xa0;μm, achieved maximum tensile strength (497.39&#xa0;N/mm<sup>2</sup>) and elongation at break (23.40%), indicating superior mechanical performance. These findings highlight the critical role of CFO particle size in tuning the functional properties of the composite films. The CFO/PVDF composites demonstrate both enhanced magnetoelectric coupling and mechanical robustness, suggesting their potential for application in flexible electronics and multifunctional sensing devices.</p>

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Improvement of magnetoelectric properties of 1-3-type PVDF-based flexible composite films based on size effect

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Shiqi Chen,
  • Weihao Wu,
  • Guiyun Sun,
  • Xiaoling Deng,
  • Rongli Gao,
  • Gang Meng,
  • Wei Cai,
  • Chunlin Fu

摘要

Flexible CoFe2O4/polyvinylidene fluoride (CFO/PVDF) composite films were fabricated via a casting technique using CFO particles synthesized hydrothermally with varying holding times. The effects of CFO particle size on phase composition, microstructure, mechanical behavior, and magnetoelectric properties of the films were systematically investigated. The CFO particles were uniformly dispersed within the PVDF matrix. As particle size increased, the composite surface became smoother and more continuous. With a 2 h holding time, corresponding to a CFO size of 7.48 × 0.59 μm, the film exhibited the highest magnetodielectric coefficient (5.22%) and a magnetoelectric coupling coefficient of − 8.98 V/(cm Oe). In contrast, CFO/PVDF-1 h films, containing CFO particles sized 5.37 × 0.50 μm, achieved maximum tensile strength (497.39 N/mm2) and elongation at break (23.40%), indicating superior mechanical performance. These findings highlight the critical role of CFO particle size in tuning the functional properties of the composite films. The CFO/PVDF composites demonstrate both enhanced magnetoelectric coupling and mechanical robustness, suggesting their potential for application in flexible electronics and multifunctional sensing devices.