Hollow γ-Fe2O3@Poly(3, 4-ethylenedioxythiophene) versus γ-Fe2O3@SiO2@Poly(3, 4-ethylenedioxythiophene) core-shell structures for highly effective microwave absorption

Abstract Hollow γ-Fe 2 O 3 @poly (3,4-ethylenedioxythiophene) (PEDOT) core-shell nanocomposites have been successfully constructed via the reaction of hydrofluoric acid and γ-Fe 2 O 3 @SiO 2 @PEDOT core-shell nanocomposites. To evaluate the microwave absorption properties, the electromagnetic parameters of the absorber and the wax composite were measured at 2–18 GHz. Investigations of the microwave absorbing properties indicate that the hollow γ-Fe 2 O 3 @PEDOT core-shell nanocomposites exhibit remarkably improved microwave absorption properties compared to the γ-Fe 2 O 3 @SiO 2 @PEDOT core-shell nanocomposites. For hollow γ-Fe 2 O 3 @PEDOT core-shell nanocomposites, a minimum reflection loss (RL) of -44.7 dB at 12.9 GHz with a matching layer thickness of 2.0 mm, and an effective absorption bandwidth (RL