Formation of a Nano-Hole via Oxidation of Metal Nanoparticles

Ryusuke Nakamura; Hideo Nakajima; Hirotaro Mori

doi:10.4028/www.scientific.net/DDF.289-292.649

Paper Titles

Alkaline-Earth Diffusion in Mixed Cation Glasses
p.615

Diffusion in Nanostructured Materials
p.623

Emission Mössbauer Spectroscopy of Grain Boundaries in Poly- and Nanocrystalline Metals
p.633

Grain Boundary Diffusion in Recrystallizing Nanocrystalline Materials
p.641

Formation of a Nano-Hole via Oxidation of Metal Nanoparticles
p.649

Surface-Sandwich Segregation Phenomena in Bimetallic Ag-Ni and Pd-Ni Nanoparticles: A Molecular Dynamics Study
p.657

Composition Effect on Shrinkage of Hollow Binary Alloy Nanospheres
p.665

Shrinkage of Hollow Nanoparticles of Oxides of Cu and Ni at High Temperatures
p.673

Essay on Techniques & Physics of Some Diffusion-Controlled Processes in Materials: Relevance to Nanofabrication Applications
p.679

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Formation of a Nano-Hole via Oxidation of Metal...

Formation of a Nano-Hole via Oxidation of Metal Nanoparticles

Abstract:

The formation of hollow metal oxide nanoparticles through oxidation process has been studied by transmission electron microscopy for Cu, Zn, Al, Pb and Ni in order to clarify the detailed formation mechanism of hollow oxide nanoparticles and their governing factors. For Cu, Zn, Al and Ni nanoparticles, hollow oxide nanoparticles are obtained as a result of vacancy aggregation in the oxidation processes. These results arise from faster outward diffusion of metal ions through the oxide layer in the oxidation processes. On the other hand, Pb nanoparticles turn to solid PbO, because the diffusivity difference DPb < DO in PbO leads to no formation of vacancy clusters.