Paper Title:
Shrinkage of Hollow Nanoparticles of Oxides of Cu and Ni at High Temperatures
  Abstract

The structural stability of hollow Cu2O and NiO nanoparticles, which were obtained via oxidation of Cu and Ni nanoparticles in air, was studied by transmission electron microscopy (TEM). Hollow Cu2O and NiO were observed to have shrunk at 473 and 623 K in annealing under 5.0×10-5 Pa, respectively, where the reduction reactions from oxides to metals started. As a result of shrinking associated with reduction, hollow oxides turned into solid metal nanoparticles after annealing at higher temperatures for a long time. In addition, hollow oxides shrunk and collapsed through high-temperature oxidation. It was found that shrinking of hollow oxides during oxidation occurs at temperature where the diffusion coefficients of slower diffusing species reach around 10-22 m2s-1. It seems that the hollow oxide nanoparticles tend to shrink and collapse at high temperatures because the hollow structures are energetically unstable.

  Info
Periodical
Defect and Diffusion Forum (Volumes 289-292)
Edited by
A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo
Pages
673-678
DOI
10.4028/www.scientific.net/DDF.289-292.673
Citation
R. Nakamura, H. Nakajima, H. Mori, "Shrinkage of Hollow Nanoparticles of Oxides of Cu and Ni at High Temperatures", Defect and Diffusion Forum, Vols. 289-292, pp. 673-678, 2009
Online since
April 2009
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