Abstract
Abstract Aligned high-density Fe2O3 nanowires were successfully obtained by thermal oxidation of Fe foil, with pre-annealing at 300 °C for 30 min. Pre-annealing in this two-step oxidation process improved the nanowire alignment and increased the density from 5.0 × 108 to 2.5 × 109 nanowires cm−2. The X-ray diffraction pattern of the Fe2O3 nanowires had a dominant (110) peak, with crystalline Fe and iron oxide phases. The improved properties are the result of formation of smaller grains during the first oxidation step.
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