Flexible rGO/Fe3O4 NPs/polyurethane film with excellent electromagnetic properties |
(a) Frequency-dependent relative complex permittivity and (b) frequency-dependent relative complex permeability. Frequency-dependent RL for the rGO/Fe3O4 NPs/PU films with different thicknesses, annealed at 300 °C (c) and at 500 °C (d). |
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