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<p>To investigate the regulatory mechanism of specially shaped inorganic ceramic fillers on the crystalline, dielectric, and piezoelectric properties of the poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films, rod-shaped potassium sodium niobate (KNN) particles are synthesized via a hydrothermal process. The incorporation of rod-shaped KNN significantly promotes the formation of the <i>β</i> crystal phase in the P(VDF-TrFE) matrix through interfacial induction effects. Consequently, the dielectric constant (<i>ε</i><sub>r</sub>) increases with the KNN content, reaching 24 at 100&#xa0;Hz. Furthermore, both the piezoelectric strain constant (<i>d</i><sub>33</sub>) and response output voltage exhibit an initial increase followed by a decrease with the increasing KNN content, achieving optimal values of 24.2&#xa0;pC/N and 3.09&#xa0;V, respectively. The result suggests that the doping of rod-shaped KNN into P(VDF-TrFE)-based composite films is a promising strategy for applications in flexible piezoelectric sensors and micro–nano energy harvesting devices.</p>

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Rod-Shaped KNN Doping to Improve the Ferroelectric and Piezoelectric Properties of a Flexible P(VDF-TrFE)-based Composite Film

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Gaopeng Lv,
  • Weimin Xia,
  • Yingjuan Yan,
  • Kaipeng Xu,
  • Biao Guan,
  • Yinghui Wang

摘要

To investigate the regulatory mechanism of specially shaped inorganic ceramic fillers on the crystalline, dielectric, and piezoelectric properties of the poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films, rod-shaped potassium sodium niobate (KNN) particles are synthesized via a hydrothermal process. The incorporation of rod-shaped KNN significantly promotes the formation of the β crystal phase in the P(VDF-TrFE) matrix through interfacial induction effects. Consequently, the dielectric constant (εr) increases with the KNN content, reaching 24 at 100 Hz. Furthermore, both the piezoelectric strain constant (d33) and response output voltage exhibit an initial increase followed by a decrease with the increasing KNN content, achieving optimal values of 24.2 pC/N and 3.09 V, respectively. The result suggests that the doping of rod-shaped KNN into P(VDF-TrFE)-based composite films is a promising strategy for applications in flexible piezoelectric sensors and micro–nano energy harvesting devices.