Scholarlink

<p>Epsilon-negative (EN, <i>ε′</i> &lt; 0) materials have demonstrated promising application prospects in fields such as electromagnetic shielding, microwave absorption, and flexible electronic devices. Among them, carbon materials have become a highly favored functional phase due to their excellent electrical properties and inherent tunability. Based on this, carbon nanotubes/polyvinylidene fluoride (CNT/PVDF) metacomposites with design principle of function/matrix were prepared using mechanical blending and hot-pressing processes, and the regulation of CNT content on the dielectric properties was systematically investigated. The 2-CNT/PVDF metacomposites successfully achieve a weak EN response on the order of − 10<sup>2</sup> within the frequency range of 20 kHz to 1 MHz. With the increase of CNT, the magnitude of <i>ε′</i> has been rapidly rising from − 10<sup>2</sup> to − 10<sup>5</sup>, accompanied by a continuous decrease in the loss tangent. This evolution of performance is mainly attributed to the gradual formation of the conductive network of CNT and the increasingly stable conductive network, accompanied by the continuous strengthening of plasmonic oscillations from weak to strong. The combination of excellent tunability and low loss positions the constructed metacomposites as an ideal candidate for next-generation flexible electronics, while the established relationship between structure and properties offers valuable insights for the design of multifunctional metamaterials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Magnitude-adjustable epsilon-negative response in kHz region based on three-dimensional carbon networks

  • 期刊论文

  • 发表日期：

    2026年2月5日

查看全文
  • Jing Mao,
  • Juxiang Ma,
  • Yunpeng Qu,
  • Hanying Wang,
  • Chunyuan Deng,
  • Xiaosi Qi

摘要

Epsilon-negative (EN, ε′ < 0) materials have demonstrated promising application prospects in fields such as electromagnetic shielding, microwave absorption, and flexible electronic devices. Among them, carbon materials have become a highly favored functional phase due to their excellent electrical properties and inherent tunability. Based on this, carbon nanotubes/polyvinylidene fluoride (CNT/PVDF) metacomposites with design principle of function/matrix were prepared using mechanical blending and hot-pressing processes, and the regulation of CNT content on the dielectric properties was systematically investigated. The 2-CNT/PVDF metacomposites successfully achieve a weak EN response on the order of − 102 within the frequency range of 20 kHz to 1 MHz. With the increase of CNT, the magnitude of ε′ has been rapidly rising from − 102 to − 105, accompanied by a continuous decrease in the loss tangent. This evolution of performance is mainly attributed to the gradual formation of the conductive network of CNT and the increasingly stable conductive network, accompanied by the continuous strengthening of plasmonic oscillations from weak to strong. The combination of excellent tunability and low loss positions the constructed metacomposites as an ideal candidate for next-generation flexible electronics, while the established relationship between structure and properties offers valuable insights for the design of multifunctional metamaterials.