Abstract
Pure and Pd-doped ceria nanoparticles were synthesised by a facile precipitation process, using cerium chloride and oxalic acid as precursors. The obtained products were characterised by XRD, FTIR, SEM, TEM, EDX, UV and PL. The XRD results show that the samples calcined at 400°C had a single phase cubic fluorite structure. The products appeared to be regularly spherical, and their sizes ranged from 10 to 15 nm. It was found that the transition metal-doped ceria nanoparticles could apparently shift the ultraviolet and visible absorption band of CeO2 towards a visible range, and significantly improve their optical activity. The produced CeO2 nanocrystals show a sharp UV emission band and the broad blue emission band. The as-synthesised ceria nanoparticles are promising materials for nanoscale optoelectronic devices, due to their excellent UV emission properties.
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