Preparation and characterization of iron oxyhydroxide and iron oxide thin films by liquid-phase deposition
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 7 (9) , 1769-1772
- https://doi.org/10.1039/a700628d
Abstract
Iron oxyhydroxide thin films have been prepared from the aqueous solution system of FeOOH–NH 4 F·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–NH 4 F·HF and H 3 BO 3 . The orientation of the deposited film differed according to the concentration of H 3 BO 3 in the solution. When the concentration of H 3 BO 3 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-Fe 2 O 3 upon heat treatment in air flow. The α-Fe 2 O 3 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.Keywords
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