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<p>Epsilon-near-zero (ENZ) materials exhibit unique electromagnetic responses when approaching plasma frequency, attracting considerable attention for advanced wave manipulation. However, achieving ENZ characteristics in the radio frequency (RF) range is often hindered by pronounced dielectric dispersion and limited material design approaches. Herein, we demonstrate a rationally engineered metacomposite that simultaneously delivers RF ENZ response and record-low dispersion. The material is fabricated by 3D printing a polydimethylsiloxane (PDMS) matrix embedded with in situ self-assembled FeCoNi nanoparticles and nitrogen-doped carbon nanotubes, which is denoted as FeCoNi-N-CNTs. This gives rise to a metacomposite showing a smooth transition of the real permittivity (<i>ε</i>′) from –27.5 at 1&#xa0;MHz to 1.5 at 110&#xa0;MHz, with a zero-crossing point at 53&#xa0;MHz. Remarkably, the variation in <i>ε</i>′ (Δ<i>ε</i>′) is only 29 across this 110-fold frequency span, representing the lowest dispersion reported to date among RF ENZ systems. Hall-effect measurements indicate preserved high carrier mobility, a key factor in dispersion suppression. Mechanistic analyses reveal that FeCoNi and N doping induce band flattening, increasing the electron effective mass and reducing carrier density. This study not only establishes a new design strategy for low-dispersion ENZ metacomposites but also paves the way for innovative RF applications such as compact antennas, sensitive sensors, and reconfigurable metamaterial equipment.</p>

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Ultralow-Dispersion Radio-Frequency Epsilon-Near-Zero Metacomposite via 3D-Printed FeCoNi-N-CNTs Architecture

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Lianru Ma,
  • Chong Wang,
  • Zixun Huang,
  • Jing Kong,
  • Xiangrong Chen,
  • Leiying Liu,
  • Xiaojun Zeng,
  • Yongrui He

摘要

Epsilon-near-zero (ENZ) materials exhibit unique electromagnetic responses when approaching plasma frequency, attracting considerable attention for advanced wave manipulation. However, achieving ENZ characteristics in the radio frequency (RF) range is often hindered by pronounced dielectric dispersion and limited material design approaches. Herein, we demonstrate a rationally engineered metacomposite that simultaneously delivers RF ENZ response and record-low dispersion. The material is fabricated by 3D printing a polydimethylsiloxane (PDMS) matrix embedded with in situ self-assembled FeCoNi nanoparticles and nitrogen-doped carbon nanotubes, which is denoted as FeCoNi-N-CNTs. This gives rise to a metacomposite showing a smooth transition of the real permittivity (ε′) from –27.5 at 1 MHz to 1.5 at 110 MHz, with a zero-crossing point at 53 MHz. Remarkably, the variation in ε′ (Δε′) is only 29 across this 110-fold frequency span, representing the lowest dispersion reported to date among RF ENZ systems. Hall-effect measurements indicate preserved high carrier mobility, a key factor in dispersion suppression. Mechanistic analyses reveal that FeCoNi and N doping induce band flattening, increasing the electron effective mass and reducing carrier density. This study not only establishes a new design strategy for low-dispersion ENZ metacomposites but also paves the way for innovative RF applications such as compact antennas, sensitive sensors, and reconfigurable metamaterial equipment.