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Gold clusters: the role of the ion energy in their formation

Published online by Cambridge University Press:  15 February 2011

Elsa Thune ,
Ettore Carpene ,
Katharina Sauthoff ,
Michael Seibt  and
Petra Reinke
Elsa Thune
Affiliation:
Zweites Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, D-37073 Göttingen, Germany
Ettore Carpene
Affiliation:
Zweites Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, D-37073 Göttingen, Germany
Katharina Sauthoff
Affiliation:
Viertes Physikalisches Institut, Universität Göttingen, Bunsenstrasse 13-15, D-37073 Göttingen, Germany
Michael Seibt
Affiliation:
Viertes Physikalisches Institut, Universität Göttingen, Bunsenstrasse 13-15, D-37073 Göttingen, Germany
Petra Reinke
Affiliation:
Zweites Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, D-37073 Göttingen, Germany
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Abstract

The rapidly growing interest in the deposition of size-selected nanoclusters on surfaces is motivated both by technology and by basic physical questions. Due to their finite size, small particles have totally different material properties compared to their bulk crystalline counterparts. Clusters have been deposited by a monoenergetic, mass-selected ion beam with low energies (10-500 eV) on amorphous carbon substrates, which are used to minimize the influence of surface crystallography and ion-induced structural changes. Gold clusters were deposited as a model system to study the ion energy dependence, the temporal evolution, and the influence of the temperature on the cluster distribution. For impact energies below 100 eV, surface processes dominate the cluster nucleation and growth. If higher energies are used, an increasing number of ions is implanted below the surface and different processes control the cluster formation. When the energy increases above 350 eV, the cluster size drastically drops below 5 nm. The clusters are analysed with different methods such as Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), and X-Ray Photoelectron Spectroscopy (XPS) to determine their size distribution, composition and structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 777: Symposium A – Nanostructuring Materials with Energetic Beams , 2003 , T8.3
Copyright
Copyright © Materials Research Society 2003

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