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<p>Significant research has focused on the distinctive and unexpected properties of lightweight, broadband, high-reflection-loss metacomposites with tunable electromagnetic characteristics. This study investigates the structural, magnetic, and electrical properties of PPy/CuFe<sub>2</sub>O<sub>4</sub>/PAM metacomposites, which exhibit negative permittivity behavior, positioning them as novel materials for advanced applications. Negative permittivity was observed at specific frequency ranges when the polypyrrole (PPy) mole fraction reached ≥ 0.064. This phenomenon is primarily attributed to the facile formation of electrical percolation networks facilitated by the interconnected PPy nanowire structure, which is critical for achieving negative permittivity and enhanced AC conductivity. By optimizing the PPy mole fraction to adjust impedance, the electromagnetic absorption performance of the metacomposites was significantly enhanced, achieving a reflection loss of − 40.5786&#xa0;dB at a thickness of 1&#xa0;mm. These findings highlight the potential of PPy/CuFe<sub>2</sub>O<sub>4</sub>/PAM metacomposites to drive innovation in the development of epsilon-negative materials, enabling lightweight, high-performance electromagnetic absorption in applications such as light-dependent resistors (LDRs) and low-frequency reflectors.</p>

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Engineering PPy/CuFe2O4/PAM Metacomposites for Tailored Epsilon-Negative Electromagnetic and Optical Responses

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Reza Gholipur

摘要

Significant research has focused on the distinctive and unexpected properties of lightweight, broadband, high-reflection-loss metacomposites with tunable electromagnetic characteristics. This study investigates the structural, magnetic, and electrical properties of PPy/CuFe2O4/PAM metacomposites, which exhibit negative permittivity behavior, positioning them as novel materials for advanced applications. Negative permittivity was observed at specific frequency ranges when the polypyrrole (PPy) mole fraction reached ≥ 0.064. This phenomenon is primarily attributed to the facile formation of electrical percolation networks facilitated by the interconnected PPy nanowire structure, which is critical for achieving negative permittivity and enhanced AC conductivity. By optimizing the PPy mole fraction to adjust impedance, the electromagnetic absorption performance of the metacomposites was significantly enhanced, achieving a reflection loss of − 40.5786 dB at a thickness of 1 mm. These findings highlight the potential of PPy/CuFe2O4/PAM metacomposites to drive innovation in the development of epsilon-negative materials, enabling lightweight, high-performance electromagnetic absorption in applications such as light-dependent resistors (LDRs) and low-frequency reflectors.