Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.19: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Water adsorption on heteroepitaxial graphene — •Janine Scherer, Samir Mammadov, Thomas Seyller, and Sabine Maier — Department für Physik, Universität Erlangen-Nürnberg

Graphene devices operated in ambient conditions are exposed to a variety of molecules. Here, we focus in particular on water, which can act as dopant and might alter the electronic properties of such devices. We study epitaxial graphene grown on 6H-SiC(0001) upon water adsorption using high resolution scanning tunneling microscopy operated in ultrahigh vacuum conditions at low temperature. We will discuss the adsorption structures of water on clean graphene surfaces with respect to the number of graphene layers. While water forms clusters on the interface layer, it leads to significant topographical changes for single and multiple graphene layers. We observe that graphene is split into small flakes in the vicinity of step edges, which is unfavorable for technological applications.