Hou, Jungang and Kumar, R. V. and Qu, Yuanfang and Krsmanovic, Dalibor (2010) Controlled synthesis of photoluminescent Bi4Ti3O12 nanoparticles from metal-organic polymeric precursor. Journal of Nanoparticle Research, 12 (2). pp. 563-571.
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Bi4Ti3O12 (BIT) nanoparticles with a narrow average particle size distribution in the range of 11â46Â nm was synthesized via a metal-organic polymeric precursor process. The crystallite size and lattice parameter of BIT were determined by XRD analysis. At annealing temperatures >550Â Â°C, the orthorhombic BIT compound with lattice parameters aÂ =Â 5.4489Â Ã , bÂ =Â 5.4147Â Ã , and cÂ =Â 32.8362Â Ã was formed while at lower annealing temperatures orthorhombicity was absent. Reaction proceeded via the formation of an intermediate phase at 500Â Â°C with a stoichiometry close to Bi2Ti2O7. The particle size and the agglomerates of the primary particles have been confirmed by FESEM and TEM. The decomposition of the polymeric gel was ascertained in order to evaluate the crystallization process from TG-DSC analysis. Raman spectroscopy was used to investigate the lattice dynamics in BIT nanoparticles. In addition, investigation of the dependence of the visible emission band around the blueâgreen color emission on annealing temperatures and grain sizes showed that the effect of grain size plays important roles, and that oxygen vacancies may act as the radiative centers responsible for the observed visible emission band.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||10 Feb 2010 09:10|
|Last Modified:||10 Feb 2010 09:10|
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