Nanostructured Films of Ordered Fe Nanowires for High-Performance Transparent Electromagnetic Interference Shielding

Althoughmetal nanowires (NWs), such as silver NWs, are ideal materialsfor flexible transparent electromagnetic shielding films, the challengeof obtaining absorptive shielding films with high transmittance andshielding efficiency (SE) still exists. To address this issue, thisstudy used iron nanowires (Fe NWs) with excellent microwave absorbingproperties to construct structures with ordered NW distributions.A series of polyethylene terephthalate (PET)/Fe NWs/poly (3,4-ethylenedioxythiophene)(PEDOT) electromagnetic interference (EMI) shielding films were preparedusing the magnetic-field-induced orientation. The results demonstratethat the ordered Fe NW network structure can effectively overcomethe problem of the trade-off between light transmittance and EMI SE.Specifically, at a Fe NW surface density of 201.78 mg/m(2), the ordered PET/Fe NWs/PEDOT films demonstrated a 49.06% increasein light transmittance and a 32.94% increase in EMI SE (19.37 dB),compared to the films with randomly distributed Fe NWs. Furthermore,constructing a double-layer Fe NW network with a stagger angle of45 degrees at the same surface density increased the EMI SE by 73.2%relative to the monolayer-ordered Fe NW structure, reaching an SEvalue of 33.54 dB, while maintaining almost unchanged light transmittance.Additionally, the PET/Fe NWs/PEDOT films maintain 97.4% of EMI performanceafter 3000 bending cycles. Overall, this study provides a new approachfor creating high-performance flexible transparent EMI shielding films.

Automated summary

This study utilized iron nanowires with excellent microwave absorbing properties to construct structures with ordered nanowire distributions, resulting in flexible transparent electromagnetic interference (EMI) shielding films with high transmittance and shielding efficiency. The ordered nanowire network structure effectively addresses the trade-off issue between light transmittance and EMI shielding efficiency, providing a new approach for creating high-performance EMI shielding films.