Ostwald Ripening in Nanoalloys: When Thermodynamics Drives a Size-Dependent Particle Composition

被引：104

作者：

Alloyeau, D. ^{[1
]}

Prevot, G. ^{[2
]}

Le Bouar, Y. ^{[3
]}

Oikawa, T. ^{[4
]}

Langlois, C. ^{[1
]}

Loiseau, A. ^{[3
]}

Ricolleau, C. ^{[1
]}

机构：

[1] Univ Paris 07, CNRS, Lab Mat & Phenomenes Quant, UMR 7162, F-75205 Paris 13, France

[2] Univ Paris 06, CNRS, Inst Nanosci Paris, UMR 7588, F-75015 Paris, France

[3] ONERA CNRS, Lab Etude Microstruct, F-92322 Chatillon, France

[4] JEOL Ltd, Tokyo 1968558, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 25期

关键词：

X-RAY-MICROANALYSIS; BIMETALLIC NANOPARTICLES; COPT NANOPARTICLES; ENERGY; STEM;

D O I：

10.1103/PhysRevLett.105.255901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ostwald ripening has been broadly studied because it plays a determinant role in the evolution of cluster size during both chemical and physical synthesis of nanoparticles. This thermoactivated process causes large particles to grow, drawing material from the smaller particles, which shrink. However, this phenomenon becomes more complex when considering the coarsening of metallic alloy clusters. The present experimental and theoretical investigations show that the relative composition of CoPt nanoparticles can be strongly modified during high temperature annealing and displays a size-dependent behavior. This compositional change originates from the higher evaporation rate of Co atoms from the nanoparticles. More importantly, this effect is expected in all alloy clusters containing species with different mobilities.

引用

页数：4

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