Synthesis of uniform quasi-octahedral CeO2 mesocrystals via a surfactant-free route
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A facile surfactant-free nonaqueous method is presented to prepare uniform quasi-octahedral ceria, CeO2, mesocrystals, in which only Ce(NO3)3 and octanol were used as the reactants at a reaction temperature of 150 °C. CeO2 sample synthesized using this technique consists of well-dispersed quasi-octahedrons and exhibits an uniform size and morphology. Based on structural characterization, it is proposed that the CeO2 mesostructure was formed by self-assembly of primary nanocrystals based on unique 3D oriented-attachment mechanism. Optical characterization exhibited a strong quantum confinement, revealing small size of primary nanocrystals. The thermal stability and UV–Vis study reveal CeO2 mesocrystal has various potential for high temperature applications and optical apparatus applications.
KeywordsCerium oxide Mesocrystal Synthesis Self-assembly Thermal stability
This study was supported by the Swedish Research Council and the Swedish Agency for International Development Cooperation (SIDA). M. S. Toprak acknowledges the fellowship from Knut and Alice Wallenbergs Foundation (No: UAW2004.0224).
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