Influence of the morphology and microstructure on the photocatalytic properties of titanium oxide films obtained by sparking anodization in H3PO4

Autor(es)

Sikora, Mariana de Souza ^[1] ; Rosario, Adriane Viana ^[1] ; Pereira, Ernesto Chaves ^[1] ; Paiva-Santos, Carlos O. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, DQ, Lab Interdisciplinar Eletroquim & Ceram LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[2] UNESP, Inst Quim, Lab Computac Anal Cristalograf & Cristalinas, LabCACC, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 56, n. 9, p. 3122-3127, MAR 30 2011.
• Citações Web of Science: 15

Resumo

The aim of this paper is to investigate changes in morphology and microstructure of TiO(2) films, prepared by sparking anodization of Ti in a H(3)PO(4) solution, by applying different formation charges. We show that although films obtained by this technique are rarely used in photocatalytic applications, the morphological and microstructural changes during sparking anodization produce TiO(2) films that can be used as photocatalysts. In contrast to qualitative analysis commonly found in the literature, we used quantitative methods of analysis to quantify average pore diameter and pore density from the morphology and structural parameters from X-ray diffraction (XRD) patterns using the Rietveld refinement. The results indicated that changes in both the morphology and crystalline structure have a strong influence on the photoactivity of the films. From this investigation, we concluded that, for films prepared in early stages of anodization, the morphology had the biggest influence on photoactivity, and after applying 72C of charge, crystalline properties dominated the photocatalytic characteristics of the films. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/00180-0 - Investigação do mecanismo de formação de filmes porosos de TiO2 obtidos por anodização galvanostática
• Beneficiário: Mariana de Souza Sikora
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 07/03880-0 - Síntese e caracterização de materiais à base de óxido de titânio nanoestruturado para uso em fotocatálise
• Beneficiário: Adriane Viana do Rosário
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado