Abstract
Abstract Hexagonal single-crystalline cerium carbonate hydroxide (CeCO 3 OH) precursors with dendrite morphologies have been synthesized by a facile hydrothermal method at 180 °C using CeCl 3 ·7H 2 O as the cerium source, triethylenetetramine as both an alkaline and carbon source, with triethylenetetramine also playing an important role in the formation of the dendrite structure. Polycrystalline ceria (CeO 2 ) have been obtained by calcining the precursor at 500 °C for 4 h. The morphology of the precursor was partly maintained during the heating process. The optical absorption spectra indicate the CeO 2 nano/microstructures have a direct band gap of 2.92 eV, which is lower than values of the bulk powder due to the quantum size effect. The high absorption in the UV region for CeO 2 nano/microstructure indicated that this material was expected to be used as UV-blocking materials.
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