Dresden 2006 – scientific programme
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DS: Dünne Schichten
DS 21: Laser and plasma processes
DS 21.4: Talk
Thursday, March 30, 2006, 17:15–17:30, GER 37
Design and application of a UHV-compatible RF plasma source to remove the ligand-sphere from self-assembled layers of CoPt3-nanoparticles — •B. Gehl1, V. Aleksandrovic2, A. Kornowski2, J.-I. Flege3, J. Falta3, H. Weller2, and M. Bäumer1 — 1Institut für Angewandte und Physikalische Chemie, Universität Bremen, Leobener Str. NW II, 28359 Bremen — 2Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg — 3Institut für Festkörperphysik, Universität Bremen, Postfach 330440, 28334 Bremen
Self-assembly from colloidal solution onto a substrate is an efficient way to create well-ordered arrays of cobalt-platinum nanoparticles on a range of substrates. To access and analyze the particles’ chemical properties, it is necessary to remove the surrounding ligand sphere. A capacitively coupled rf-plasma-source was designed to strip the particles of their ligands and to let the treated samples be transferred into a UHV-environment without exposure to the atmosphere to avoid contamination. Compatibility to the standard omicron-type sample transfer system was maintained. In SE microscopy it was shown that the particles kept their identity and monodisperse size distribution after treatment in plasmas of oxygen or a mixture of argon and hydrogen. In SEM and GISAXS-measurements the two dimensional ordering of the particle layers was confirmed to be largely maintained. The plasma parameters were varied and the resulting effects on the chemical properties of treated layers such as carbon content, oxide formation and contamination with electrode material were analyzed with XP spectroscopy.