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Growth and characterization of ceria thin films and Ce-doped gamma-Al2O3 nanowires using sol-gel techniques

Gravani, S, Polychronopoulou, K, Stolojan, V, Cui, Q, Gibson, PN, Hinder, SJ, Gu, Z, Doumanidis, CC, Baker, MA and Rebholz, C (2010) Growth and characterization of ceria thin films and Ce-doped gamma-Al2O3 nanowires using sol-gel techniques NANOTECHNOLOGY, 21 (46). - - -. ISSN 0957-4484

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Abstract

γ-Al2O3 is a well known catalyst support. The addition of Ce to γ-Al2O3 is known to beneficially retard the phase transformation of γ-Al2O3 to α-Al2O3 and stabilize the γ-pore structure. In this work, Ce-doped γ-Al2O3 nanowires have been prepared by a novel method employing an anodic aluminium oxide (AAO) template in a 0.01 M cerium nitrate solution, assisted by urea hydrolysis. Calcination at 500 °C for 6 h resulted in the crystallization of the Ce-doped AlOOH gel to form Ce-doped γ-Al2O3 nanowires. Ce3 + ions within the nanowires were present at a concentration of < 1 at.%. On the template surface, a nanocrystalline CeO2 thin film was deposited with a cubic fluorite structure and a crystallite size of 6–7 nm. Characterization of the nanowires and thin films was performed using scanning electron microscopy, transmission electron microscopy, electron energy loss spectroscopy, x-ray photoelectron spectroscopy and x-ray diffraction. The nanowire formation mechanism and urea hydrolysis kinetics are discussed in terms of the pH evolution during the reaction. The Ce-doped γ-Al2O3 nanowires are likely to find useful applications in catalysis and this novel method can be exploited further for doping alumina nanowires with other rare earth elements.

Item Type: Article
Uncontrolled Keywords: ENERGY-LOSS SPECTROSCOPY, PORE-STRUCTURE STABILITY, SUPPORTED-RH CATALYSTS, ANODIC AL2O3 FILMS, ALUMINA MEMBRANES, CORROSION PROTECTION, THERMAL-STABILITY, FABRICATION, NANOTUBES, BOEHMITE
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 03 Nov 2011 14:35
Last Modified: 23 Sep 2013 18:48
URI: http://epubs.surrey.ac.uk/id/eprint/7517

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