Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.13: Poster
Monday, March 27, 2006, 18:00–21:00, P2
Local surface potential analysis of vapor phase deposited bifunctional phosphonic acid self-assembled monolayers by means of Kelvin probe force microscopy — •Mathias Rodenstein1, Christian Loppacher1, Ulrich Zerweck1, Evelyn Jähne2, Sibylle Gemming3, Gotthard Seifert3, and Lukas Eng1 — 1Institute of Applied Photophysics, Technische Universität Dresden, D-01062 Dresden, Germany — 2Institute of Macromolecular Chemistry and Textile Chemistry, TU Dresden, D-01062 Dresden, Germany — 3Institute of Physical Chemistry and Electrochemistry, TU Dresden, D-01062 Dresden, Germany
Mono- and bifunctional self-assembly monolayers (SAM) having a phosphonic acid (PA) anchoring group were investigated with respect to their film formation and interface dipolar properties on the nanometer scale. Films were grown by physical vapor phase deposition onto muscovite mica under UHV conditions and compared to liquid phase deposited PA-SAMs formed on mica and oxidic substrates such as SiO2.
The local growth behavior was analyzed using non-contact scanning force microcopy (nc-SFM). We find a similar growth behavior for the two different deposition methods used here. The layer formation follows three steps: island nucleation, aggregation, and coalescence. Furthermore, we inspected our PA-SAMs with respect to the build-up of an interface and molecular dipole by simultaneously complementing our nc-SFM measurements with frequency modulated Kelvin probe force microscopy (KPFM).