Please use this identifier to cite or link to this item: https://doi.org/10.1021/cg901515r
Title: Synthesis, growth mechanism, and properties of open-hexagonal and nanoporous-wall ceria nanotubes fabricated via alkaline hydrothermal route
Authors: Wu, X.
Kawi, S. 
Issue Date: 7-Apr-2010
Citation: Wu, X., Kawi, S. (2010-04-07). Synthesis, growth mechanism, and properties of open-hexagonal and nanoporous-wall ceria nanotubes fabricated via alkaline hydrothermal route. Crystal Growth and Design 10 (4) : 1833-1841. ScholarBank@NUS Repository. https://doi.org/10.1021/cg901515r
Abstract: Ce(OH)3 open-hexagonal nanotubes [Ce(OH)3-OH-NT] and Ce(OH)3 nanoporous-wall nanotubes [Ce(OH)3-NW-NT] have been successfully synthesized, for the first time, by a hydrothermal alkaline route and characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer'Emmett'Teller method, differential thermal analysis'thermogravimetric analysis, and temperature-programmed reduction. The growth mechanism of Ce(OH) 3-OH-NT via a hydrothermal alkaline route has been found to occur by the dissolution and recrystallization of surrounding Ce(OH)3 compounds followed by anisotropical growth of Ce(OH)3-OH-NT gradually along the c-axis of nanotubes. The growth of Ce(OH)3-OH-NT has been observed, for the first time, to occur over two different Ce(OH)3 compound bases: multidirectional growth of Ce(OH)3-OH-NT over a Ce(OH)3 spherical core base to obtain nanotube flowers and vertical growth of Ce(OH)3-OH-NT over a Ce(OH)3 flat base to obtain a nanotube jungle. Ce(OH)3-NW-NT has been successfully fabricated by further treating Ce(OH)3-OH-NT under static alkaline treatment at room temperature. Calcination of Ce(OH)3-OH-NT and Ce(OH) 3-NW-NT leads to the formation of CeO2 open-hexagonal nanotubes (CeO2-OH-NT) and CeO2 nanoporous-wall nanotubes (CeO2-NW-NT), respectively. CeO2-OH-NT and CeO 2-NW-NT are found to have higher surface area, easier reducibility, and higher mobility of surface oxygen species than CeO2 nanoparticles (CeO2-NP). © 2010 American Chemical Society.
Source Title: Crystal Growth and Design
URI: http://scholarbank.nus.edu.sg/handle/10635/90290
ISSN: 15287483
DOI: 10.1021/cg901515r
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