Patterning Co nanoclusters on thin-film Al2O3/ NiAl(100)

M. F. Luo, C. I. Chiang, H. W. Shiu, S. D. Sartale, C. C. Kuo

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Self-organized patterning of supported nanoclusters by virtue of low cost and readiness for mass production is considered as one of the most promising methods; however, this approach is challenging, since the capability of controlling the patterns relies on a suitable combination of clusters and templates. In this paper we demonstrate that Co nanoclusters grown from vapour deposition over Al2O3 thin films on NiAl(100) substrate make a perfect combination for self-organized patterning. Uniform and sizeable Co nanoclusters are formed only on crystalline Al2O3 films and they are highly aligned by protrusion structures of the crystalline Al 2O3. Through simple thermal treatments we can pattern the crystalline Al2O3 films and consequently the grown Co nanoclusters. The patterns are robust as they are sustained even when the Co nanoclusters are flashed to 750 K, exposed to atmosphere or the coverage is increased to coalescence. Moreover, the patterns can be further refined by using STM tips. The results imply potential applications in both fundamental and applied researches for electronic and magnetic nanodevices as well as catalysis.

Original languageEnglish
Pages (from-to)360-366
Number of pages7
JournalNanotechnology
Volume17
Issue number2
DOIs
StatePublished - 28 Jan 2006

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