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O: Fachverband Oberflächenphysik
O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)
O 55.76: Poster
Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F
Valence band spectroscopy on functionalized cellulose surfaces — •Lothar Klarhöfer1, Kai Volgmann1, Wolfgang Maus-Friedrichs1, Volker Kempter1, and Wolfgang Viöl2 — 1TU-Clausthal, Institut für Physik und Physikalische Technologien, Leibnizstraße 4, D-38678 Clausthal-Zellerfeld — 2HAWK FH Hildesheim/Holzminden/Göttingen, Fakultät Naturwissenschaften und Technik, Von-Ossietzky-Straße 99, 37085 Göttingen
XPS (X--Ray Photo--Electron Spectroscopy) has become a popular technique in pulp and paper science. Nevertheless, neither XPS valence band spectra nor UPS spectra (Ultra Violet Photo Electron Spectroscopy) were reported so far, although valence band spectra is well--known to provide detailed information of the chemical state at the surfaces enabling the analysis of different treatments.
We use XPS core level and valence band spectra in combination with UPS (HeI/HeII) and MIES (Metastable Impact Electron Spectroscopy). In order to understand the recorded spectra of cellulose several spectra of so--called "fingerprint" molecules were prepared and compared with the origin cellulose spectra.
Both the Cellulose and the model surfaces, were plasma treated by a dielectric barrier discharge in order to enhance the wetting behavior of the surface. Untreated and synthetic--air--plasma treated model surfaces were compared with respect to the surface composition of functional groups. Functionalities containing oxygen were significantly increased on plasma--treated samples, shown both with core level XPS and UPS and MIES.