Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 16: Ion beam solid interaction I

DS 16.1: Hauptvortrag

Donnerstag, 30. März 2006, 09:30–10:15, GER 37

Ion beam shaping of nanometals — •Arjen Vredenberg — Debye Institute, Utrecht University

Metal nanorods and nanowires have great potential in a wide range of fields, because of their tunable (by shape and size) optical and magnetic properties. We present a new and unique way of producing nanorods and -wires, embedded in a solid, that are aligned in the same direction. Starting from spherical Au nanocolloids in a silica film we will show that the colloids are shaped controllably into rods and -at later stages- wires by irradiation with an MeV heavy ion beam. The ion-beam induced anisotropy (from a spherical colloid to a rod) is caused by the highly anisotropic ion track: a long, few nm diameter cylinder of highly excited material. The colloids elongate and form rods with their long axis in the direction of the ion beam. The mechanism of this deformation is still under investigation, but we will discuss possible origins, involving anisotropy in mechanical or mass balance gradients.