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Dresden 2006 – scientific programme

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DS: Dünne Schichten

DS 17: Ion beam solid interaction II

DS 17.6: Talk

Thursday, March 30, 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 Novakovic1,3, and Vasil Koteski31Ionenstrahllabor 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.

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