Abstract:The opportunities of the hot wall aerosol synthesis, i.e. conventional spray pyrolysis (CSP) method are demonstrated for the generation of highly spherical threedimensional (3D) nanostructured phosphor particles with uniformly distributed components, phases and nano-clustered inner structure. With the presumption that certain particle morphology is formed during the evaporation/drying stage, the aerosol transport properties and powder generation are correlated with the particles structural and morpholog-ical features. With the help of various analyzing techniques like Field Emission Scanning Electron Micros-copy (FE-SEM), Transmission Electron Microscopy (TEM) coupled with energy dispersive X-ray Analysis and STEM mode (TEM/EDS), X-ray Powder Diffraction (XRPD) and fluorescence measurements the feasi-ble processing of up-conversion rare-earth Y 2 O 3 :Er, Yb phosphors powders are discussed.
Hierarchically assembled TiO 2 nanoparticles into larger spherical ones were obtained using aerosol-assisted processing method. Unagglomerated particles with the mean size of 440 nm were obtained from colloidal solution of TiO 2 nanoparticles (~4.5 nm) using ultrasonic spray pyrolysis at 550 o C. Their morphological complexity and structural polymorphism were investigated by using X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) coupled with selected area electron diffraction (SAED) analysis.Pronounced evolution of nanocrystalline TiO 2 (B) phase assembled together with the anatase building units (sized ~ 15 nm) in uniform submicrometric particles implicate their feasibility to be used in dye-sensitized solar cells and lithium ion batteries.
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