Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 81: Graphene: Transport

HL 81.10: Vortrag

Donnerstag, 17. März 2011, 17:00–17:15, POT 151

Polymer Brushes on Graphene — •Max Seifert¹, Marin Steenackers^1,2, Alexander Gigler³, Ning Zhang², Frank Deubel², Candy Xuan Lim⁴, Kiang Loh⁴, José Garrido¹, Rainer Jordan^2,5, 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.