Epitaxial NiO hillocks on truncated octahedral nanoparticles of passivated Ni

Y. S. Kwok*, X. X. Zhang, Boxiong Qin, K. K. Fung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Epitaxial NiO hillocks on the {111} and {001} facets of truncated octahedral nanoparticles of Ni have been directly observed by high-resolution transmission electron microscopy. These nanometer hillocks form a rough shell enclosing the Ni nanoparticle. The epitaxial relationships of NiO on nanoparticles of Ni are the same as those of NiO on bulk Ni {111} and {001} surfaces. The formation of hillocks is related to the relaxation of the compressive stress in NiO arising from the very large lattice mismatch between NiO and Ni. The compressively stressed epitaxial NiO shell provides effective protection to the nanoparticles of Ni against further oxidation.

Original languageEnglish (US)
Pages (from-to)3061-3063
Number of pages3
JournalJournal of Applied Physics
Issue number5
StatePublished - Mar 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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