Akademik Veri Yönetim Sistemi
Composites Communications, cilt.64, 2026 (SCI-Expanded, Scopus)
Electromagnetic (EM) pollution arising from modern wireless systems has intensified the demand for lightweight, durable, and high-performance absorption-dominant shielding materials. Most reported electromagnetic shielding materials are based on thermosets and exhibit limited impedance matching, thereby restricting their applicability in next-generation wearable technologies. In this study, thermoplastic polyethersulfone (PES) nanocomposites were fabricated using four filler architectures—MWCNTs, Fe3O4 nanoparticles, Fe3O4–MWCNT hybrids, and Fe3O4@MWCNT structures—to systematically compare their electromagnetic behavior and elucidate the underlying dielectric–magnetic mechanisms governing microwave attenuation. Because the samples were measured as unbacked and free-standing films, absorption was determined directly from A = 1 − R − T, rather than the classical RL(dB) expressions that assume metal-backed configurations. The complex permittivity and permeability were retrieved using the Nicolson–Ross–Weir method in the 8.2–18 GHz range. MWCNTs primarily enhanced the energy storage (ε′) and dielectric loss (ε″) through conduction and interfacial polarization, whereas Fe3O4 primarily reduced dielectric mismatch and enabled enhanced electromagnetic wave penetration by introducing magnetic loss contributions. The combined Fe3O4+MWCNT system (NC3) exhibited the most balanced dielectric–magnetic response. The optimum composition (50 wt% Fe3O4+ 5 wt% MWCNT) achieved ∼17–19% incident electromagnetic wave absorption in the X band and ∼19–22% in the Ku band, outperforming the MWCNT-only (NC1) and Fe3O4-only (NC2) nanocomposites. Overall, this study provides an absorption-dominant EMI shielding mechanism-oriented comparison of magnetic, dielectric, and hybrid fillers in a thermoplastic matrix, demonstrating the potential of PES-based nanocomposites for next-generation EMI shielding materials with high absorptivity applications.