Berlin 2005 – scientific programme
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DS: Dünne Schichten
DS 12: Ionen-Festkörper-Wechselwirkung II
DS 12.5: Talk
Monday, March 7, 2005, 12:15–12:30, TU HS107
Trapping and transport of gold atoms in tracks of swift heavy ions — •C. Dais1, W. Bolse1, and J. K. N. Lindner2 — 1Institut für Strahlenphysik, Universität Stuttgart — 2Institut für Physik, Universität Augsburg
We have investigated the modification of single- and multi-markerlayers
of Au in NiO on Si-substrate due to irradiation with swift heavy ions.
The samples were analysed with RBS, TEM and AFM. A redistribution of the
Au-atoms into cylindrical tracks parallel to the beam direction was
found. For Kr-irradiation the Au filled tracks have a length of 20-30nm
and are symmetrically distributed around the initial marker plane. For
Au and Xe ions these tracks reach the surface where the Au segregates
into spherical nano-particles. In case of Au irradiated multilayers
continous Au nanowires of about 6nm in diameter and a length of up to
180nm are formed.
Trapping and transport of Au was found to depend on the
marker-thickness, marker-position, irradiation angle and irradiation
temperature. The marker-thickness is of particular importance: the lower
the thickness the slower is the Au transport.
We present a model which explains the phenomenon by a combination of
trapping in and transport along the hot ion track. Trapping of the
Au-atoms occurs due to recrystalisation of the ion track, while the
transport is induced by the high pressure build up in the melt phase.