Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.35: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Online monitoring of the surface properties of mixed polymer brushes via in-situ infrared ellipsometry — •Dennis Aulich1, Igor Luzinov2, Olha Hoy2, Leonid Ionov3, Sergiy Minko4, Klaus-Jochen Eichhorn3, Manfred Stamm3, Norbert Esser1, Ulrich Schade5, and Karsten Hinrichs1 — 1ISAS, Department Berlin, Albert-Einstein-Str. 9, 12489 Berlin — 2Clemson University, Clemson, SC 29634-0971, USA — 3IPF Dresden, Hohe Str. 6, 01069 Dresden — 4Clarkson University, Potsdam, New York 13699, USA — 5BESSY II, Albert-Einstein-Str. 15, 12489 Berlin
As a new type of functional surfaces, mixed polymer brushes offer a wide range of applications due to the possibility of changing the surface properties by external stimuli such as pH, solvent, light or electric field [ 1,2 ]. Two different mixed polymer brushes were prepared using two subsequent "grafting to" procedures (a mixed P2VP-PAA and a mixed PEG-PAA/PS brush, each with 50/50 composition). The composition of the film was analyzed quantitatively by VIS-IR-ellipsometry. The in-situ-characterization was done by polarization dependent infrared (IR) ellipsometry in single reflection geometry both in the laboratory and in the synchrotron IR beamline at BESSY II. Exposure of the samples to different solutions at varying pH led to structural and chemical changes. Repeating cycles of systematic change of pH led to strong, reversible switching of the brush which was analyzed online via the component specific vibrational bands of the polymers.
References: [ 1 ] S. Minko et al., Macromol. Rapid Commun. 22(3): 206, 2001; [ 2 ] L. Ionov et al., Langmuir 21(19): 8711, 2005