Abstract
Synthesizing nanostructure’s importance is due to the applications that these materials can offer. Electrochemical anodization is considered an easily accessible technique; variables control allows to obtain diverse morphologies (from nanopores to nanotubes). The main reaction is oxide – reduction, it produces a protective oxide layer to metals and promotes different morphologies. Anodized iron sheets were carried out, with a concentration of 1.2 M of NH4F in a solution of ethylene glycol and water. The anodization time (5, 10, 15, and 20 minutes) was varied to a constant potential of 30 Volts. The substrates were subjected to annealing of 450 °C for 2 hours to obtain the hematite phase, it was observed that the morphology changed to nanoflakes. With Raman spectroscopy and X-ray diffraction, phase mixing (hematite and magnetite) was determined. The bandgap of 2.15 eV was determined with diffuse reflectance
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