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Thickness induced transversal percolation in Pt-Al2O3 nano-composites |
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| Authors: | M. Maaza O. Nemraoui J. Lafait B. Baruch-Barak |
| Affiliation: | a Nanosciences Laboratories, Materials Research Group, iTHEMBA LABS, P.O. Box 722, Somerset West, Faure 7129, South Africa b Physics Department, Rand Afrikaans University, Auckland Park, P.O. Box 392, Johannesburg, South Africa c Laboratoire d'Optique des Solides, Universite Pierre-Marie Curies, Paris VI, Paris, France d Laboratoire Surface and Interface, Universite du Maine, Le Mans, France e School of Physics, Haifa Technion, Haifa, Israel f Princeton Materials Institute, Princeton University, Princeton, NJ 08544, USA g Groupe de Physique des Solides et Sciences des Materiaux, Universite Cheikh Anta-Diop de Dakar, Fann, Senegal |
| Abstract: | Investigations of thickness induced percolation process in Ptξ-Al2O3 nano-composites were carried out using grazing angle X-ray scattering. It is shown that the morphological characteristics of the nano-scaled Pt particles change significantly within the growth transversal direction. The initially non percolated two phases Ptξ-Al2O3 nano-composites show a noteworthy tendency to a percolated morphology with a gradual transversal increase of Pt nano-particles' average diameter in addition to the increase of the Pt nano-particles' poly-dispersity. This transversal morphological evolution is followed by a percolation phenomenon of the Pt nano-particles for a thickness of about ∼119.5 nm. This transversal morphological evolution seems to corroborate far too much with a columnar growth process. |
| Keywords: | 61.46.+w |
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