Electrochemical fabrication and optical properties of periodically structured porous Fe2O3 films

Periodically structured Fe2O3 films are successfully fabricated by anodizing Fe foils using sinusoidally modulated current waveforms. The fabricated Fe2O3 films possess nanopores and long-range structural periodicities which can be conveniently adjusted by tuning the anodization parameters. Strong optical response and vivid film color were readily observed on the fabricated Fe2O3 films.

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► Periodically structured porous Fe2O3 was synthesized by a simple anodization method.
► The nanostructure can be conveniently adjusted by tuning the anodization parameters.
► Vivid colors can be readily observed on these Fe2O3 films.
► Their potential application in optical sensing is demonstrated.