Fabrication of Self‐Supported Patterns of Aligned β‐FeOOH Nanowires by a Low‐Temperature Solution Reaction

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Abstract
Self‐supported patterns of oriented alignment of β‐FeOOH nanowires are fabricated through a simple solution reaction from the complex [Fe(phen)3]2+ at 60 °C. The alignment of nanowires with a diameter of 40 nm and length of 6 μm is relatively uniform. HRTEM studies show that the growing direction of β‐FeOOH nanowires is perpendicular to the orientation plane of self‐formed β‐FeOOH flake‐like substrates. In the reaction and crystal growth process, the precursor [Fe(phen)3]2+ is undoubtedly vital to the formation of nanowire alignment. In detail, the formation of aligned nanowires is thought to be realized by controlling two competing reactions. Electrochemical and UV‐visible measurements suggest that the product might have potential applications in lithium batteries and semiconductor electronics. This synthetic process is simple, mild, clean, reproducible, and free of any template; it provides a novel pathway for the low‐temperature growth of nanowires and their simultaneous oriented alignment.