INVESTIGADORES
ACUÑA Leandro Marcelo
artículos
Título:
Preparation and characterisation of nanostructured gadolinia-doped ceria tubes
Autor/es:
RODOLFO O. FUENTES, FERNANDO F. MUÑOZ, LEANDRO M. ACUÑA, A. GABRIELA LEYVA AND RICHARD T. BAKER
Revista:
JOURNAL OF MATERIALS CHEMISTRY
Editorial:
ROYAL SOC CHEMISTRY
Referencias:
Año: 2008 vol. 18 p. 5689 - 5695
ISSN:
0959-9428
Resumen:
In this work, nanostructured gadolinia-doped ceria tubes (GdxCe1xO2x/2 with x ¼ 0.1 and 0.2) were
synthesised following a very simple, high yield procedure and their properties were characterised by
XRD and by electron microscopy (SEM and HRTEM). Tubes of both oxide compositions were
comprised of nanocrystals that exhibited the cubic phase (Fm 3m space group). In SEM, the tubes were
found to have lengths of around 2 mm, diameters of around 700 nm and wall thicknesses of about
10 nm. The SEM and TEM results showed that individual tubes were composed of a thin sheet of
nanoparticles curved round to form the tubular structure. The size of these primary nanoparticles was
calculated from the peak-broadening seen in the XRD results. Average crystallite sizes of 7.8 and
9.4 nm were found for Gd0.1Ce0.9O1.95 and Gd0.2Ce0.8O1.9, respectively. Electron microscopy
observations confirmed the size range of these nanoparticles by direct observation. The nanostructured
Gd0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).xCe1xO2x/2 with x ¼ 0.1 and 0.2) were
synthesised following a very simple, high yield procedure and their properties were characterised by
XRD and by electron microscopy (SEM and HRTEM). Tubes of both oxide compositions were
comprised of nanocrystals that exhibited the cubic phase (Fm 3m space group). In SEM, the tubes were
found to have lengths of around 2 mm, diameters of around 700 nm and wall thicknesses of about
10 nm. The SEM and TEM results showed that individual tubes were composed of a thin sheet of
nanoparticles curved round to form the tubular structure. The size of these primary nanoparticles was
calculated from the peak-broadening seen in the XRD results. Average crystallite sizes of 7.8 and
9.4 nm were found for Gd0.1Ce0.9O1.95 and Gd0.2Ce0.8O1.9, respectively. Electron microscopy
observations confirmed the size range of these nanoparticles by direct observation. The nanostructured
Gd0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).Fm 3m space group). In SEM, the tubes were
found to have lengths of around 2 mm, diameters of around 700 nm and wall thicknesses of about
10 nm. The SEM and TEM results showed that individual tubes were composed of a thin sheet of
nanoparticles curved round to form the tubular structure. The size of these primary nanoparticles was
calculated from the peak-broadening seen in the XRD results. Average crystallite sizes of 7.8 and
9.4 nm were found for Gd0.1Ce0.9O1.95 and Gd0.2Ce0.8O1.9, respectively. Electron microscopy
observations confirmed the size range of these nanoparticles by direct observation. The nanostructured
Gd0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).mm, diameters of around 700 nm and wall thicknesses of about
10 nm. The SEM and TEM results showed that individual tubes were composed of a thin sheet of
nanoparticles curved round to form the tubular structure. The size of these primary nanoparticles was
calculated from the peak-broadening seen in the XRD results. Average crystallite sizes of 7.8 and
9.4 nm were found for Gd0.1Ce0.9O1.95 and Gd0.2Ce0.8O1.9, respectively. Electron microscopy
observations confirmed the size range of these nanoparticles by direct observation. The nanostructured
Gd0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).0.1Ce0.9O1.95 and Gd0.2Ce0.8O1.9, respectively. Electron microscopy
observations confirmed the size range of these nanoparticles by direct observation. The nanostructured
Gd0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).0.1Ce0.9O1.95 tubes exhibited a higher value of specific surface area, at 97 m2 g1, than the other
composition (61 m2 g1).2 g1).