Growth of Nanostructured Polycrystalline Cerium Oxide Through a Solvothermal Precipitation Using Near-Supercritical Fluids

Title
Growth of Nanostructured Polycrystalline Cerium Oxide Through a Solvothermal Precipitation Using Near-Supercritical Fluids
Authors
임종민안재평김상우
Keywords
Nanofiber; Nanoparticle; Cerium Oxide; One-Dimensional Growth; Supercritical Fluid; Nanostructured Materials
Issue Date
2010-01
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 10, 130-134
Abstract
Well-crystallized cerium dioxide with cubic phase were formed and self-assembly grown to nanofibers or nanosheets via a solvothermal precipitation from near-supercritical fluids without any help of metal catalysts or capping agents. The self-assembly attachment process without any preferred or selective orientation dominated the growth of the polycrystalline nanofibers or nanosheets consisting of grains of ∼3 nm to which are formed by the coalescence of the single crystalline cerium oxide seeds. The growth is attributed to be driven by phase separation due to partial compatibility between ethyl alcohol and supercritical carbon dioxide fluid during the precipitation reaction, not by different surface energies or defects. With increasing temperature, the nanofibers with a weblike network structure were formed and then fused to large spherical particles. As a result, the polycrystalline fibers or sheets consisting of pure cerium dioxide phase were produced by the solvothermal reaction with an aid of the supercritical carbon dioxide from the alcoholic metal salt solution.
URI
http://pubs.kist.re.kr/handle/201004/37742
ISSN
1533-4880
Appears in Collections:
KIST Publication > Article
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