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<p>The proliferation of electronic devices has intensified the critical need to address electromagnetic (EM) radiation pollution. In response, advanced nanomaterials with enhanced EM interference (EMI) shielding effectiveness are being actively developed. The present study introduces a multifunctional composite engineered for superior performance, in which a thin layer of silver nanoparticles (Ag NPs) is synergistically combined with a polypyrrole/carbon black (PPy/CB) matrix. The PPy/CB nanocomposite was synthesized via chemical polymerization and subsequently coated with a uniform layer of Ag NPs (75 ± 5 nm) using pulsed laser deposition (PLD). Comprehensive characterization through FE-SEM, XRD, FT-IR, TGA, DSC, and UV–Vis spectroscopy confirmed the successful formation of the PPy/CB/Ag composite and its tailored properties. The optimal formulation (5 wt% CB with Ag NP coating) demonstrated a high electrical conductivity of 0.113 S/cm and exceptional EMI shielding effectiveness, reaching − 54 dB&#xa0;in the X-band (8.2–12.4 GHz) and − 36 dB&#xa0;in the C-band (4–8 GHz). This performance is attributed to a low skin depth that decreased with increasing frequency. The PPy/CB/Ag composite exhibited tunable optical band gaps, with three direct gaps decreasing from 2.4, 3.9, and 6.1 eV to 2.4, 3.6, and 5.9 eV, respectively, and three indirect gaps decreasing from 2.1, 2.7, and 5.7 eV to 2.1, 2.5, and 5.5 eV, respectively, along with significantly enhanced thermal stability (decomposition temperature up to 750 °C). The PPy/CB/Ag composite successfully integrates high electrical conductivity, effective EM attenuation, tunable optical properties, and robust thermal stability. These multifunctional characteristics position it as a promising candidate for next-generation EMI shielding applications in advanced electronics and telecommunications.</p>

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Pulsed laser deposition of nano-silver supercharges polypyrrole/carbon black for effective electromagnetic shielding

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Ali N. Obead,
  • Nadia A. Ali

摘要

The proliferation of electronic devices has intensified the critical need to address electromagnetic (EM) radiation pollution. In response, advanced nanomaterials with enhanced EM interference (EMI) shielding effectiveness are being actively developed. The present study introduces a multifunctional composite engineered for superior performance, in which a thin layer of silver nanoparticles (Ag NPs) is synergistically combined with a polypyrrole/carbon black (PPy/CB) matrix. The PPy/CB nanocomposite was synthesized via chemical polymerization and subsequently coated with a uniform layer of Ag NPs (75 ± 5 nm) using pulsed laser deposition (PLD). Comprehensive characterization through FE-SEM, XRD, FT-IR, TGA, DSC, and UV–Vis spectroscopy confirmed the successful formation of the PPy/CB/Ag composite and its tailored properties. The optimal formulation (5 wt% CB with Ag NP coating) demonstrated a high electrical conductivity of 0.113 S/cm and exceptional EMI shielding effectiveness, reaching − 54 dB in the X-band (8.2–12.4 GHz) and − 36 dB in the C-band (4–8 GHz). This performance is attributed to a low skin depth that decreased with increasing frequency. The PPy/CB/Ag composite exhibited tunable optical band gaps, with three direct gaps decreasing from 2.4, 3.9, and 6.1 eV to 2.4, 3.6, and 5.9 eV, respectively, and three indirect gaps decreasing from 2.1, 2.7, and 5.7 eV to 2.1, 2.5, and 5.5 eV, respectively, along with significantly enhanced thermal stability (decomposition temperature up to 750 °C). The PPy/CB/Ag composite successfully integrates high electrical conductivity, effective EM attenuation, tunable optical properties, and robust thermal stability. These multifunctional characteristics position it as a promising candidate for next-generation EMI shielding applications in advanced electronics and telecommunications.