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DOI: 10.1039/A700628D (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 1769-1772

Preparation and characterization of iron oxyhydroxide and iron oxide thin films by liquid-phase deposition

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Shigehito Deki, Yoshifumi Aoi, Junko Okibe, Hiroshi Yanagimoto, Akihiko Kajinami and Minoru Mizuhata

Abstract

Iron oxyhydroxide thin films have been prepared from the aqueous solution system of FeOOH–NH4F·HF (aq.) with added boric acid by a novel liquid-phase deposition (LPD) method and is the first attempt to preparate iron oxide thin films by this method. A crystalline β-FeOOH thin film was formed directly on the substrate upon immersion into a mixed solution of FeOOH–NH4F·HF and H3BO3 . The orientation of the deposited film differed according to the concentration of H3BO3 in the solution. When the concentration of H3BO3 was >0.30 mol dm-3 , the β-FeOOH thin film was preferentially oriented in the [211] direction. The β-FeOOH thin film formed was transformed into α-Fe2O3 upon heat treatment in air flow. The α-Fe2O3 thin films obtained were oriented in the [110] direction. The F content of the as-deposited β-FeOOH film was ca. 15% F/Fe and was reduced to 0.19% upon heat treatment.

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