Thermal morphological evolution of platinum nano-particles in Pt–Al2O3 nano-composites |
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| Institution: | 1. Nanosciences Laboratories, Solid State Materials Group, iTHEMBA LABS, PO Box 722, Somerset West 7129, Faure, South Africa;2. Physics Department, Rand Afrikaans University, Auckland Park, PO Box 392, Johannesburg, South Africa;3. Laboratoire d''Optique des Solides, Universite Pierre-Marie Curie, Paris VI, France;4. Laboratoire Surface and Interface, Universite du Maine, Le Mans, France;5. High Pressure-High Temperature Group, University of the Witwatersrand-Johannesburg, Wits 2050, Johannesburg, South Africa |
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| Abstract: | Temperature morphological evolution of nonpercolated granular nano-structures of platinum nano-particles embedded in an insulating alumina matrix was investigated by X-rays scattering in grazing angle reflection mode. In the investigated temperature range of 298–823 K, it was found that the annealing treatment tends to increase the Pt nano-particles' size and to produce a quasi-mono-disperse Pt nano-particles followed by a reduction of the barrier thickness between them. The percolation temperature is estimated to be of the order of 890 K. Using the rate constant governing the growth of the Pt nano-particles, the corresponding activation energy was determined to be about 90 kJ/mol. |
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