Mesoporous characteristics of crystalline indium-titania synthesized by the sol-gel route
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Mesoporous nanocrystalline titanium dioxide with narrow pore size distribution was prepared by the sol-gel technique. During synthesis, the gels were doped with indium salt incorporation in the early gelation stage. The presence of indium had an evident influence on the phase transition of TiO2 and the nucleation process. Crystal sizes were estimated by X-ray diffraction (XRD). Mesoporous structures in indium-doped titania were maintained after heat treatment at 400 and 600 °C for 4 h, exhibiting significant thermal stability. The brookite phase was observed in samples that underwent phase transition. In this paper, we have studied the relationship between textural properties and phase transition, discussing the possible role of average crystal size.
KeywordsIndium Titanium dioxide Solid–solid transition Mesoporous characteristics Surface morphology
We are grateful for the financial support of CONACYT and CONCYTEG through the research grant that they have awarded. We would also like to thank Prof. Pier Paolo Lottici and Dr. Danilo Bersani from Parma University for their hospitality, for generously-allowing the Raman spectra recording and for their assistance in interpreting Raman spectra.
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