Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Adsorption on semiconductors, oxides and insulators II
O 14.2: Vortrag
Montag, 26. März 2012, 16:15–16:30, MA 041
Nucleation, growth and shape of Au clusters on CeO2 (111) — •Hans Hermann Pieper and Michael Reichling — Universität Osnabrück, Germany
Gold nano-clusters of variable size on CeO2 (111) are investigated by non-contact atomic force microscopy (NC-AFM) and Kelvin probe force microscopy (KPFM). The cluster size and nucleation behaviour is controlled by means of sample temperature during deposition and post-deposition annealing. The exact cluster shape is revealed by Kelvin compensated NC-AFM and measurements in the constant height mode, thus eliminating tip convolution effects and image distortion due to electrostatic forces.
Furthermore, we establish a relation between the KPFM contrast and the cluster size and demonstrate charging of individual clusters to an equivalent of a few electrons.