Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)

O 44.22: Poster

Mittwoch, 28. März 2007, 17:00–19:30, Poster C

Electron spectroscopy on functionalized lignin-like materials — •Lothar Klarhöfer¹, Burkhard Roos¹, Wolfgang Maus-Friedrichs¹, Volker Kempter¹, and Wolfgang Viöl² — ¹Institut für Physik und Physikalische Technologien, Leibnizstraße 4, D-38678 Clausthal-Zellerfeld, Germany — ²Hochschule für angewandte Wissenschaft und Kunst, Fakultät Naturwissenschaften und Technik, Von-Ossietzky-Str. 99, D-37085 Göttingen, Germany

XPS is a common technique for characterizing lignin-like materials, such as pulp and paper or wood surfaces. We combine valence band XPS with MIES (Metastable Impact Electron Spectroscopy) UPS (HeI) (Ultraviolet Photoelectron Spectroscopy) in order to identify functionalities which are difficult to detect with core level XPS due to the small chemical shift. With MIES / UPS it is possible to identify different functional groups of the surfaces, allowing to control surface - modification techniques applied to lignin - like materials, such as the optimization of the plasma treatment of wooden surfaces. Lignin surfaces were characterized by XPS, MIES and UPS. In order to understand the results, additional fingerprint spectra were recorded using the lignin precursors (coniferyl alcohol and sinapyl alcohol), cinnamon alcohol, phenol and benzene. The comparison with the MIES and UPS spectra of these molecules allows the identification of the contributions of the hydroxyl, methoxy and phenol groups the the lignin spectra.