In situ-templated hydrothermal synthesis of Fe-doped anatase nanorods

resumo

Anatase single crystal nanorods with aspect ratios of 4-10 and diameters of 70-100 nm were prepared by hydrothermal treatment of tetraethylammonium hydroxide peptized titania sol doped with Fe(III) cations at 200 degrees\C. Two types of iron sources were used as dopants: (i) Fe(NO3)(3), which could form alpha-FeOOH during the hydrothermal synthesis; (ii) hydrothermally synthesized ot-FeOOH. The formation of anatase nanorods in the Fe3+ doped titania could be attributed to porous goethite (alpha-FeOOH) rods formed during the hydrothermal treatment. The in situ formed ot-FeOOH template could lead to well dispersed anatase nanorod crystals in contrast to the strongly agglomerated rods obtained when adding as-synthesized ot-FeOOH. The templates do not need to be removed since a solid solution forms between the Fe ions and anatase during hydrothermal treatment. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

palavras-chave

NANOSIZED TITANIA POWDERS; NANOWIRE ARRAYS; GOLD NANORODS; ASPECT-RATIO; NANOTUBES; TIO2; NANOSTRUCTURES; PHOTOCATALYSTS; GOETHITE; SURFACE

categoria

Materials Science; Metallurgy & Metallurgical Engineering

autores

Yang, J; Mei, S; Quaresma, S; Norby, P; Ferreira, JMF

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