Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session III (Methods: Atomic and electronic structure; Methods: electronic structure theory; Methods: Molecular simulations and statistical mechanics; Methods: Sanning probe techniques; Methods: other (experimental); Methods: other (theory) )

O 60.30: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B2

Comparative EELS on carbon-based materials — •Thomas Haensel, Stefan Krischok, Juergen A. Schaefer, and Syed Imad-Uddin Ahmed — Institut für Physik and Institut für Mikro- und Nanotechnologien, TU Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany

Carbon-based materials are of great interest, due to the many possible applications in various fields. For example regenerative wood-based biopolymers made of cellulose, lignin and additives are expected to be low-cost ground materials for the use in various typical polymer applications such as fuel cells. Additionally, hard synthetic materials like diamond-like (DLC) and nanocrystalline diamond (NCD) films are relevant as transparent protective coatings, use in bio-sensor systems and electron emitters. In contrast to DLC films, graphite (HOPG) is very soft and has a high electric conductivity. In this contribution various carbon-based materials were analyzed with electron energy loss spectroscopy (EELS), which is a surface sensitive technique and provides information about plasmons in the surface and mean surface region. Additionally, these materials were characterized with XPS to extract further information about the chemical composition and functional groups at the surface. The so called π-plasmon as well as other energy losses will be discussed and a comparative survey of EELS of surfaces with different surface preparations will be presented.