Design of mesostructured γ-Fe2O3/carbon nanocomposites for electromagnetic wave absorption applications

We propose and demonstrate a scheme to enhance microwave absorption property through mesoporous structure with high regularity. The mesostructured nanocomposites, embedding γ-Fe2O3 within carbon matrix, exhibit a strong and broadband attenuation of microwave in the frequency range of 0.5–18 GHz, mainly due to the better impedance matching. C-2Fe-900 exhibits strong absorption characteristics with an absorption peak of −32.0 dB at 6.4 GHz. The absorption peak intensity and position can be adjusted by changing the matching thickness of the coating. Reflection loss below −10 dB (i.e., absorption above 90%) is obtained in the frequency range of 1.9–10.7 GHz.

Mesostructured γ-Fe2O3/carbon nanocomposites exhibit a strong and broadband attenuation of microwave in the frequency range of 0.5–18 GHz, mainly due to the better impedance matching.Figure optionsDownload as PowerPoint slideHighlights
► Incorporation of magnetic constituents and the creation of vacancies were done simultaneously.
► Mesoporous structure with magnetic species contributes to the better impedance matching.
► The absorption peak intensity and position can be adjusted easily.