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Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature
Mohammadi, M. R ; Sharif University of Technology | 2011
1093
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- Type of Document: Article
- DOI: 10.1007/s11998-011-9347-9
- Publisher: 2011
- Abstract:
- The low temperature perovskite-type strontium titanate (SrTiO 3) 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-SrTiO 3 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 m 2/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
- Keywords:
- AFM image ; Average grain size ; BET surface area ; Hydrodynamic diameter ; Low temperatures ; Mesoporous ; Mesoporous structures ; Nano-crystalline structures ; Nanocrystallines ; Orientation growth ; Room temperature ; Sol-gel routes ; SrTiO ; Surface area ; Synthesized powder ; TEM images ; Crystallite size ; Gels ; Mesoporous materials ; Nanocrystalline powders ; Particle size analysis ; Perovskite ; Powders ; Sol-gel process ; Sol-gels ; Sols ; Strontium ; Strontium alloys ; Strontium titanates ; Surface structure ; Thin films ; X ray diffraction ; X ray powder diffraction ; Film preparation
- Source: Journal of Coatings Technology Research ; Volume 8, Issue 5 , July , 2011 , Pages 585-593 ; 15470091 (ISSN)
- URL: http://link.springer.com/article/10.1007%2Fs11998-011-9347-9