INVESTIGADORES
ACUÑA Leandro Marcelo
artículos
Título:
Formation and Structural Properties of Ce-Zr Mixed Oxide Nanotubes
Autor/es:
RODOLFO O. FUENTES, LEANDRO M. ACUÑA, MARÍA G. ZIMICZ, DIEGO G. LAMAS, J. G. SACANELL, A. GABRIELA LEYVA, AND RICHARD T. BAKER
Revista:
CHEMISTRY OF MATERIALS
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2008 vol. 20 p. 7356 - 7363
ISSN:
0897-4756
Resumen:
In this work, ZrO2-CeO2 mixed oxide nanotubes with 50, 70, and 90 mol % CeO2 were synthesized
following a very simple, high yield procedure, and their properties were characterized by synchrotron
radiation XRD and by high resolution electron microscopy. The 50, 70, and 90 mol % CeO2 nanotubes
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
following a very simple, high yield procedure, and their properties were characterized by synchrotron
radiation XRD and by high resolution electron microscopy. The 50, 70, and 90 mol % CeO2 nanotubes
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
2-CeO2 mixed oxide nanotubes with 50, 70, and 90 mol % CeO2 were synthesized
following a very simple, high yield procedure, and their properties were characterized by synchrotron
radiation XRD and by high resolution electron microscopy. The 50, 70, and 90 mol % CeO2 nanotubes
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
2 nanotubes
exhibited the tetragonal phase (t¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m¡ä-form and t¡ä¡ä-form, P42/nmc space group) or the cubic phase (Fm3m
space group). The nanotube walls were composed of nanoparticles with an average crystallite size ranging
from 4.7 to 7.6 nm. Electron microscopy observations confirmed the size of these nanoparticles by direct
observation. The SEM and TEM results showed that individual nanotubes were composed of a curved
sheet of these nanoparticles. By SEM analysis, the nanotubes were found to have lengths of around 1-8-8
¦Ìm, diameters of around 500 nm, and wall thicknesses of 20 nm. Elemental analysis showed that Ce:Zr
ratios appeared to be constant across space, suggesting compositional homogeneity in the samples. The
90 mol % CeO2 nanotubes exhibited the highest value of specific surface area, 101 m2 ¡¤ g-1, which
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
ratios appeared to be constant across space, suggesting compositional homogeneity in the samples. The
90 mol % CeO2 nanotubes exhibited the highest value of specific surface area, 101 m2 ¡¤ g-1, which
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
m, diameters of around 500 nm, and wall thicknesses of 20 nm. Elemental analysis showed that Ce:Zr
ratios appeared to be constant across space, suggesting compositional homogeneity in the samples. The
90 mol % CeO2 nanotubes exhibited the highest value of specific surface area, 101 m2 ¡¤ g-1, which
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
compared with about 28 m2 ¡¤ g-1 for the other two compositions.
2 nanotubes exhibited the highest value of specific surface area, 101 m2 ¡¤ g-1, which
compared with about 28 m2 ¡¤ g-1 for the other two compositions.2 ¡¤ g-1 for the other two compositions.