Purvanto, Agus and Hidayat, Darmawan and Terashi, Yoshitake and Okuyama, Kikuo (2008) Synthesis of Monophasic CaxBa(1-x)TiO3 Nanoparticles with High Ca Content (x > 23%) and Their Photoluminescence Properties. CHEMISTRY OF MATERIALS , 20 (24). 7440- 7446 . ISSN 0897-4756
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We report for the first time the fabrication of monophasic CaxBa(1-x)TiO3 nanoparticles with high Ca content using a flame assisted spray pyrolysis (FASP) method. The biphasic structure (mixture of tetragonal BaTiO3 and orthorhombic CaTiO3 phases) was not detected in nanoparticles where x > 23%. The as-prepared nanoparticles were spherical, nonagglomerated, and polycrystalline with a relatively narrow size distribution (sigma(g) = 1.23 - 1.28). STEM-EDS mapping revealed that all components (Ca, Ba, Ti) were homogeneously distributed inside the nanoparticles. The optical properties were evaluated by doping of CaxBa(1-x)TiO3 nanoparticles with Pr3+ ions. CaxBa(1-x)TiO3:Pr3+ nanophosphors exhibited an intense red emission at a wavelength of 612 nm. Interestingly, the excitation-wavelength peaks varied over the range of 323.2 to 354.2nm by variation of x.
|Subjects:||Physical Science > Nanophysics|
Material Science > Functional and hybrid materials
Material Science > Nanochemistry
|Deposited On:||10 Feb 2010 13:55|
|Last Modified:||15 Feb 2010 16:53|
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