Thermal morphological evolution of platinum nano-particles in Pt-Al2O3 nano-composites

被引：29
|
作者：
Maaza, M
Nemraoui, O
Sella, C
Lafait, J
Gibaud, A
Pischedda, V
机构：
[1] iTHEMBA LABS, Solid State Mat Grp, Nanosci Labs, ZA-7129 Faure, South Africa
[2] Rand Afrikaans Univ, Dept Phys, Johannesburg, South Africa
[3] Univ Maine, Lab Surface & Interface, F-72017 Le Mans, France
[4] Univ Witwatersrand, High Pressure High Temp Grp, ZA-2050 Wits, Johannesburg, South Africa
[5] Univ Paris 06, La Opt Solides, Paris, France
来源：
PHYSICS LETTERS A | 2005年 / 344卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
nano-composites; percolation process; growth process; small angle X-ray scattering; grazing incidence;
D O I：
10.1016/j.physleta.2005.06.072
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：57 / 63
页数：7
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