Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 24: Particles and clusters

O 24.4: Vortrag

Dienstag, 23. März 2010, 11:15–11:30, H34

Structural properties of individual mass-filtered 3d-metal nanoparticles deposited on W(110) — •Wolfgang Rosellen¹, Christian Kleinhans¹, Volker Hückelkamp¹, Furkan Bulut¹, Joachim Bansmann², Armin Kleibert³, and Mathias Getzlaff¹ — ¹Institute of Applied Physics, University of Düsseldorf — ²Dep. of Surface Chemistry, Ulm University — ³Swiss Light Source, Paul Scherrer Institute

Nano-sized clusters and particles are regarded as a new class of material because their physical and chemical properties can significantly change with size. Thus, new features are accessible and additionally tunable by size-selection. Due to the high surface-to-volume ratio and the reduction of the coordination numbers the properties also differ from the respective bulk material such as melting point, conductance or electronic and, for magnetic particles, magnetic behavior. Fe, Co and FeCo alloy nanoparticles were produced by a continuously working arc cluster ion source (ACIS), mass-filtered by means of an electrostatic quadrupole and subsequently deposited on a W(110) surface. We discuss the structural properties of individual nanoparticles with diameters between 3 nm and 15 nm. High-resolution transmission electron microscopy (HR-TEM) is used to estimate the size and the crystallographic structure of the nanoparticles before deposition. The height and shape after deposition is investigated by scanning tunneling microscopy (STM). Additionally, the melting behaviour of the nanoparticles at elevated temperatures will be discussed.