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Anisotropic growth of gas–liquid precipitated ceria mesocrystals to wires several micrometers in length

Author:
Kubota, Yuta, Kishi, Tetsuo, Yano, Tetsuji, Matsushita, Nobuhiro
Source:
RSC advances 2018 v.8 no.43 pp. 24370-24375
ISSN:
2046-2069
Subject:
ammonia, anisotropy, ceric oxide, nitrates, pH
Abstract:
Ceria (CeO₂) wires with lengths of 6 μm and diameters of tens of nanometers are fabricated through the anisotropic growth of mesocrystals. In the gas–liquid precipitation process, an aqueous Ce(NO₃)₃ solution is used as a starting material and NH₃ gas is used to induce CeO₂ precipitation at the gas–liquid interface. CeO₂ mesocrystals, formed by this process at 60 °C, grow in the direction of 〈011〉 into micrometer length wires exposing {001} and {011} on their side walls. It is shown that the initial pH of the starting material solution is a key parameter to attain anisotropic growth of the CeO₂ mesocrystals. We thus propose the formation mechanism of micrometer length-CeO₂ wires from mesocrystals.
Agid:
6186622