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Monodisperse CeO 2 hollow nanoparticles were synthesized by a template-free hydrothermal method. The average size of the nanoparticles was measured to be 75nm. Detailed experiments revealed that the CeO 2 hollow nanoparticles were formed directly by oriented attachment of the initial CeO 2 nanocrystals. Although Cu 2+ was introduced into the system, the final CeO ...
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