https://doi.org/10.1007/s100530170138
Structure of metal nanowires in nanoporous alumina membranes studied by EXAFS and X-ray diffraction
1
Centre for Materials Research, School of Physical Sciences,
University of Kent, Canterbury CT2 7NR, UK
2
Institut für Anorganische Chemie, Universität GH Essen,
Universitätsstr. 5-7, D-45117 Essen, Germany
Corresponding author: a R.E.Benfield@ukc.ac.uk
Received:
30
November
2000
Published online: 15 September 2001
The structure of nanowires of different metals grown within nanoporous alumina membranes has been studied by EXAFS, WAXS and high energy X-ray diffraction. Nanowires of gold, silver, copper and iron adopt the lattice structure and bond distances of the bulk metals. Cobalt nanowires on the other hand were composed of a mixture of hcp phase, stable at room temperature, and fcc phase, which in bulk cobalt is normally stable only at high temperatures, in a ratio depending on the pore size. The nanowires are non-continuous but are made of nanocrystallites whose shape and size was found to depend strongly on the metal. All the metals except gold showed the presence of a preferred orientation which was slight in the case of Ag and Cu but much stronger in the case of iron and cobalt nanowires.
PACS: 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc. / 61.10.-i – X-ray diffraction and scattering / 61.46.+w – Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
