Molten hydrated salt was used, for the first time, as a new kind of solvent to explore the synthesis of complex oxide nanomaterials, Employing Ba(OH)(2)center dot 8H(2)O as the solvent, and rutile TiO2 as the reactant, core-shell and hollow nanoparticles of perovskite-type BaTiO3 were successfully fabricated under sealed conditions at 180 degrees C. No other additive was introduced into the reaction system. The effect of various reaction conditions on the morphology and size of the products was investigated. At high TiO2 dosage, core-shell BaTiO3 particles were the dominant products with their sizes between 400 and 800 nm, whereas relatively low TiO2 dosage favored the formation of hollow BaTiO3 particles less than 250 nm. The formation process of the products was investigated, and can be attributed to an Ostwald ripening induced hollowing mechanism. Because of its simplicity and scalability, the molten hydrated salt method may open up a promising route for the synthesis of complex oxide micro/nanomaterials for practical applications.
Chinese Acad Sci, Xinjiang Key Lab Elect Informat Mat & Devices, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China;Chinese Acad Sci, Key Lab Plant Resources & Chem, Xinjiang Tech Inst Phys & Chem, Arid Area, Urumqi 830011, Peoples R China;Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
Tian Xuelin,Li Juan,Chen Kai,et al. Template-Free and Scalable Synthesis of Core-Shell and Hollow BaTiO3 Particles: Using Molten Hydrated Salt as a Solvent[J]. CRYSTAL GROWTH & DESIGN,2009,9(11):4927-4932.