Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature

M. R. Mohammadi, D. J. Fray

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The low temperature perovskite-type strontium titanate (SrTiO3) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol-gel route. The prepared sol had a narrow particle size distribution with hydrodynamic diameter of about 17 nm. X-ray diffraction (XRD) revealed that the synthesized powders had a perovskite-SrTiO3 structure with preferable orientation growth along the (1 0 0) direction. TEM images showed that the average crystallite size of the powders annealed in the range 300-800°C was around 8 nm. FE-SEM analysis and AFM images revealed that the deposited thin films had mesoporous and nanocrystalline structure with the average grain size of 25 nm at 600°C. Based on Brunauer-Emmett-Taylor (BET) analysis, the synthesized powders showed mesoporous structure with BET surface area in the range 92-75 m2/g at 400-600deg;C. One of the smallest crystallite sizes and one of the highest surface areas reported in the literature were obtained, which can be used in many applications, such as photocatalysts.

    Original languageEnglish
    Pages (from-to)585-593
    Number of pages9
    JournalJournal of Coatings Technology and Research
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - Oct 2011

    Keywords

    • Nanocrystalline
    • Room temperature
    • Sol-gel
    • Strontium titanate

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