Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces III

O 33.2: Vortrag

Dienstag, 12. März 2013, 10:45–11:00, H45

Novel approach to the fabrication of mixed monomolecular films and chemical patterns — •M Nuruzzaman Khan and Michael Zharnikov — Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany

Self-assembled monolayes (SAMs) provide a convenient and flexible means to control surface properties by covering surfaces with chemically uniform and densely packed monomolecular films. A versatile approach to prepare mixed SAMs and SAM-based chemical patterns on coinage metal substrates is irradiation promoted exchange reaction (IPER). The key idea of this approach is tuning the extent of the exchange reaction between a SAM covering the substrate and a potential molecular substituent by electron irradiation. As such substituents, different thiols are usually used. Here we show that not only thiols but also disulfides can serve as substituents in IPER, which extends significantly the possibilities of this approach, making it suitable for another class of commercially available compounds. Using several model disulfide compounds, we studied the outcome and kinetics of IPER in this particular case and compared them with the analogous performance of thiols. Additionally, the approach was combined with electron beam lithography and applied to the fabrication of chemical patterns which were amplified in the z-direction by surface initiated atom transfer radical polymerization.