Synthesis and Characterization of Single-Crystal Ce(OH)CO_3 and CeO_2 Triangular Microplates

摘要

Single-crystal cerium hydroxide carbonate (Ce(OH)CO_3) triangular microplates with the hexagonal phase have been successfully synthesized by a hydrothermal method at 150 deg C using cerium nitrate (Ce(NO_3)_3 centre dot 6H_2O) as the cerium source,aqueous carbamide as both an alkaline and carbon source,and cetyltrimethylammonium bromide (CTAB) as a surfactant.Single-crystal ceria (CeO_2) triangular microplates have been fabricated by a thermal decomposition-oxidation process at 650 deg C for 7 h using single-crystal Ce(OH)CO_3 microplates as the precursor.The shape of the Ce(OH)CO_3 microplate was sustained after thermal decomposition-oxidation to CeO_2.The products were characterized by X-ray powder diffraction (XRD),transmission electron microscopy (TEM),field-emission scanning electron microscopy (FE-SEM),differential scanning calorimetric analysis (DSC),and thermogravimetric analysis (TG).