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Journal of Nanomaterials
Volume 2012, Article ID 475430, 6 pages
http://dx.doi.org/10.1155/2012/475430
Research Article

Photoelectrochemical Properties of F e 𝟐 O 𝟑 Supported on T i O 2 -Based Thin Films Converted from Self-Assembled Hydrogen Titanate Nanotube Powders

1Institute/Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea
2Department of Environmental Engineering, Sunchon National University, Sunchon 540-742, Republic of Korea
3Department of Metallurgical & Materials Engineering, Inha Technical College, Incheon 402-752, Republic of Korea

Received 6 April 2012; Revised 16 June 2012; Accepted 16 June 2012

Academic Editor: Jiaguo Yu

Copyright © 2012 Kyung-Jong Noh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A photoanode was fabricated using hematite (α-Fe2O3) nanoparticles which had been held in a thin film of hydrogen titanate nanotubes (H-TiNT), synthesized by repetitive self-assembling method on FTO (fluorine-doped tin oxide) glass, which were incorporated via dipping process in aqueous Fe(NO3)3 solution. Current voltage (I-V) electrochemical properties of the photoanode heat-treated at 500°C for 10 min in air were evaluated under ultraviolet-visible light irradiation. Microstructure and crystallinity changes were also investigated. The prepared Fe2O3/H-TiNT/FTO composite thin film exhibited about threefold as much photocurrent as the Fe2O3/FTO film. The improvement in photocurrent was considered to be caused by reduced recombination of electrons and holes, with an appropriate amount of Fe2O3 spherical nanoparticles supported on the H-TiNT/FTO film. Nanosized spherical Fe2O3 particles with about 65 wt% on the H-TiNT/FTO film showed best performance in our study.