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DS: Dünne Schichten

DS 17: Ion beam solid interaction II

DS 17.6: Vortrag

Donnerstag, 30. März 2006, 12:30–12:45, GER 37

Ion-beam induced nano-sized metal clusters in glass — •Heinz-Eberhard Mahnke¹, Beate Schattat¹, Ivo Zizak¹, Peter Schubert-Bischoff², Nikola Novakovic^1,3, and Vasil Koteski³ — ¹Ionenstrahllabor ISL, HMI Berlin — ²HMI Berlin — ³VINČA Institute, Belgrade

We have studied the formation of Ag-metal clusters in soda lime glass with x-ray absorption spectroscopy (XAS), with transmission electron microscopy (TEM), and with small angle x-ray scattering (SAXS). Silver was introduced by ion exchange into 0.1-mm thick glass platelets. While annealing under a reducing atmosphere of Ar with a few % H₂ already leads to the formation of metal clusters, such clusters are not very uniform in size and are randomly distributed over the Ag-containing glass volume. Irradiating these Ag-containing glass platelets with 600-MeV Au ions with fluences around 10¹² ions/cm² at ISL followed by annealing, the distribution of the size of the metal clusters becomes more uniform and the clusters are arranged in chains parallel to the direction of the ion beam. While the metallic form of Ag in the glass is proven by determining the local structure (co-ordination and inter-atomic distances) with EXAFS, measured at HASYLAB, the arrangement of the clusters in chains and their size is made visible by TEM. In a first SAXS experiment on the newly commissioned 7T-MPW beamline at BESSY an arrangement of the clusters approaching a columnar shape with a diameter around 7 nm could be proven. An extension to Cu-metal clusters is under way.