Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.28: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Polymer-Functionalized Carbon Structures: A Raman Spectroscopy View — •Evgeniya Sheremet, Raul D. Rodriguez, Thomas Ebert, Susanne Höhne, Stefan Spange, Ovidiu D. Gordan, and Dietrich R. T. Zahn — Chemnitz University of Technology, D-09107 Chemnitz, Germany
Raman spectroscopy is a powerful technique for structural studies of polymer-coated carbon structures. Here, we discuss the challenges of obtaining reliable Raman data and their interpretation using several model systems: phenolic resin on graphite flakes and poly(ethylhexylacrylate) with a pyrene headgroup, polyvinylamin, and polyacrylamide adsorbed on multi-wall carbon nanotubes (MWCNT). It is shown that such composites reveal clear G and D bands (around 1582 cm−1 and 1350 cm−1, respectively) characteristic of carbon structures with sp2 hybridization, and modifications induced by the polymer coating are discussed. From all polymers studied the largest degree of interaction with MWCNT was found for poly(ethylhexylacrylate) as deduced from an upward shift of the G peak mostly likely due to compressive forces induced by the polymer on the nanotube walls. However, organic materials, as well as carbon structures, can be strongly affected by laser irradiation. It was shown that phenolic resin is removed by UV excitation, what resulted in a decrease in its Raman signature. Pure MWCNT also demonstrate a decrease of D peak after laser irradiation. In this work a systematic analysis of D and G band shifts in Raman spectroscopy of polymer-carbon composites is presented.