Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)

O 59.16: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P3

Nanoparticle impact on a W(110) surface — •Wolfgang Rosellen, Hendrik Bettermann, and Mathias Getzlaff — Institute of Applied Physics,University Duesseldorf

Deposited clusters and nanoparticles become more and more interesting from a technological point of view due to their size dependent electronic and magnetic properties. Therefore it is important to have access to the structure of these deposited particles. We will show that the deposition event itself is primarily responsible concerning the shape of the particles. In molecular dynamical simulation by Haberland et al. different kinetic energies result in a softlanding process of the particles without deformation due to themalization up to an implantation of particles into the substrate surface. In our experiments we investigate nanoparticles with different sizes and deposition energies. The particles are preformed in the gas phase by a UHV compatible Arc Ion Cluster Source (ACIS) being developed for softlanding condition. The kinetic energy of the particles are far below 1eV/atom. For mass and therefore size selection an electrostatic quadrupole is used at the exit of the particle source. This is possible due to 50% of all particles are positively or neagtively charged. Our investigations are carried on a bare W(110) surface. The deposited nanoparticles, mainly Fe, Co and their alloy are investigated by the means of Scanning Tunneling Microscope under UHV conditions. To gain a deeper insight into the landing process we will discuss the resulting shape of charged nanoparticles after accelerating the particles in an electrostatic field to prevent the nanoparticles from softlanding.