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HL: Fachverband Halbleiterphysik
HL 81: Graphene: Transport
HL 81.10: Talk
Thursday, March 17, 2011, 17:00–17:15, POT 151
Polymer Brushes on Graphene — •Max Seifert1, Marin Steenackers1,2, Alexander Gigler3, Ning Zhang2, Frank Deubel2, Candy Xuan Lim4, Kiang Loh4, José Garrido1, Rainer Jordan2,5, Martin Stutzmann1, and Ian Sharp1 — 1Walter Schottky Institut, TU München, Germany — 2Wacker-Lehrstuhl für Makromolekulare Chemie, TU München, Germany — 3CeNS and Department of Earth and Environmental Sciences, LMU München, Germany — 4Department of Chemistry, National University of Singapore, Singapore — 5Professur für Makromolekulare Chemie, Department Chemie, TU Dresden, Germany
We show that the direct photografting and photopolymerization of styrene yields polystyrene brush layers covalently bound to graphene. The broad applicability of this technique is demonstrated via polymerization on CVD grown graphene on Cu, epitaxial single and few layer graphene on SiC, and reduced graphene oxide. Scanning confocal Raman spectroscopy reveals that photopolymerization results in no significant disruption of the basal plane conjugation of graphene. Atomic force microscopy on few layer graphene reveals delamination due to intercalative polymerization. Finally, direct photopolymerization was attempted with a range of other vinyl monomers, none of which exhibited reactivity with graphene. However, in an alternative route we demonstrate that unreactive monomers can be locally grafted via an intermediate carbon layer formed by electron-beam-induced carbon deposition on the graphene surface.