Stable, freestanding Ge nanocrystals

I. D. Sharp, Q. Xu, C. Y. Liao, D. O. Yi, J. W. Beeman, Z. Liliental-Weber, K. M. Yu, D. N. Zakharov, J. W. Ager, D. C. Chrzan, E. E. Haller

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38 Scopus citations

Abstract

Freestanding Ge nanocrystals that are stable under ambient conditions have been synthesized in a two-step process. First, nanocrystals with a mean diameter of 5 nm are grown in amorphous Si O2 by ion implantation followed by thermal annealing. The oxide matrix is then removed by selective etching in diluted HF to obtain freestanding nanocrystals on a Si wafer. After etching, nanocrystals are retained on the surface and the size distribution is not significantly altered. Freestanding nanocrystals are stable under ambient atmospheric conditions, suggesting formation of a self-limiting native oxide layer. For freestanding as opposed to embedded Ge nanocrystals, an additional amorphouslike contribution to the Raman spectrum is observed and is assigned to surface reconstruction-induced disordering of near-surface atoms.

Original languageEnglish
Article number124316
JournalJournal of Applied Physics
Volume97
Issue number12
DOIs
StatePublished - 2005

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