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<p>With the rapid growth of the electronic information industry, electromagnetic interference (EMI), information leakage, and radiation have emerged as pressing concerns. Traditional metallic shielding materials, however, are limited by their heavy weight and poor corrosion resistance, driving demand for high-performance alternatives. This study modifies the traditional electroless plating process via in situ polymerization of polydopamine (PDA), constructing an Ag@PDA@Al core–shell structure on flaky aluminum powder to fabricate high-performance silver-coated aluminum powder. Under optimal condition-including 30wt% Ag content, 9:2:1 reductant ratio (potassium sodium tartrate: glucose: silver nitrate), 40&#xa0;°C plating temperature, and reductant-first feeding, the powder achieves 79&#xa0;dB EMI shielding effectiveness (SE) in the X-band (8.2–12.4&#xa0;GHz). A trilayer Fabry–Perot (F–P) cavity coating further enhances SE by ~ 10&#xa0;dB compared to monolithic films. The coating also exhibits excellent comprehensive properties: thermal insulation (ΔT &lt; 6&#xa0;°C in 10&#xa0;min), flexibility, UV resistance, and salt spray corrosion resistance, with SE remaining stable (~ 15&#xa0;dB) after 7-day salt exposure. This work proposes a simple, low-cost preparation process, elucidates how filler content and structural design regulate shielding performance, and offers insights for efficient EMI coatings. The material holds promise for flexible electronics, 5G communications, and aerospace applications.</p>

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Preparation of flaky silver-coated aluminum powder (Ag@PDA@Al) and performance of high electromagnetic shielding coatings based on F–P resonant cavity

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Haoyu Xu,
  • Fengtian Zhou,
  • Lechun Deng,
  • Qinqin Lu,
  • Qiang Chen

摘要

With the rapid growth of the electronic information industry, electromagnetic interference (EMI), information leakage, and radiation have emerged as pressing concerns. Traditional metallic shielding materials, however, are limited by their heavy weight and poor corrosion resistance, driving demand for high-performance alternatives. This study modifies the traditional electroless plating process via in situ polymerization of polydopamine (PDA), constructing an Ag@PDA@Al core–shell structure on flaky aluminum powder to fabricate high-performance silver-coated aluminum powder. Under optimal condition-including 30wt% Ag content, 9:2:1 reductant ratio (potassium sodium tartrate: glucose: silver nitrate), 40 °C plating temperature, and reductant-first feeding, the powder achieves 79 dB EMI shielding effectiveness (SE) in the X-band (8.2–12.4 GHz). A trilayer Fabry–Perot (F–P) cavity coating further enhances SE by ~ 10 dB compared to monolithic films. The coating also exhibits excellent comprehensive properties: thermal insulation (ΔT < 6 °C in 10 min), flexibility, UV resistance, and salt spray corrosion resistance, with SE remaining stable (~ 15 dB) after 7-day salt exposure. This work proposes a simple, low-cost preparation process, elucidates how filler content and structural design regulate shielding performance, and offers insights for efficient EMI coatings. The material holds promise for flexible electronics, 5G communications, and aerospace applications.