Vertically Oriented Iron Oxide Films Produced by Hydrothermal Process: Effect of Thermal Treatment on the Physical Chemical Properties

Autor(es)

Ferraz, Lucas C. C. ^[1] ; Carvalho, Jr., Waldemir M. ^[1] ; Criado, Denise ^[1] ; Souza, Flavio L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 4, n. 10, p. 5515-5523, OCT 2012.
• Citações Web of Science: 31

Resumo

Our study describes the influence of the thermal treatment on the fundamental properties of the vertical oriented iron oxide nanorods synthesized under hydrothermal condition onto a conductor substrate. X-ray diffraction and X-ray absorption near edge structure spectra were used to investigate the phase evolution from iron oxyhydroxide (beta-FeOOH) to pure hematite phase. The formation of nanorods distributed along of substrate was observed by top-view SEM images and the rod growth preferentially oriented at the highly conductive (001) basal plane of hematite, perpendicular to the substrate. Light absorption capacity increases with the temperature of treatment and the electronic transitions (direct and indirect electronic transition) were estimated from this result. From the electrochemical measurement, the hematite/electrolyte interface was evaluated. These findings demonstrated that the temperature plays an important role on the hematite (structural, morphological, and catalytic) properties and that many influences must work in great harmony in order to produce a promising hematite photoanode. (AU)

• Processo FAPESP: 11/19390-8 - Influência da temperatura nas propriedades fotocatalíticas de filmes nanoestruturados de Fe2O3
• Beneficiário: Lucas Costa de Castro Ferraz
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 10/02464-6 - Estudo de nanoestruturas de óxidos metálicos aplicados a células fotovoltaicas
• Beneficiário: Flavio Leandro de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular