Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Graphene V

O 65.8: Vortrag

Donnerstag, 29. März 2012, 12:15–12:30, MA 041

Conversion of aromatic self-assembled monolayers on Cu substrates into graphene sheets — •Nils-Eike Weber¹, Dan Matei¹, Rainer Stosch², Armin Gölzhäuser¹, and Andrey Turchanin¹ — ¹Physik supramolekularer Systeme und Oberflächen, Universität Bielefeld — ²Physikalisch-Technische Bundesanstalt, Braunschweig

Aromatic thiol-based self-assembled monolayers (SAMs) on gold can be converted into nanocrystalline graphene sheets via electron irradiation induced cross-linking and thermal annealing [1, 2]. To realize the role of substrate in this process, we study the conversion of biphenylthiol SAMs into graphene on copper substrates. To this end, Low Energy Electron Diffraction, Scanning Tunneling Microscopy, X-ray Photoelectron Spectroscopy and Raman Spectroscopy were employed. The use of copper substrates leads to an increase of the crystallinity of graphene sheets in comparison to those obtained on gold substrates. This result makes it promising to attempt the synthesis of high quality graphene for electronic applications using the suggested molecular approach.
[1] A. Turchanin et al., Adv. Mater. 21, 1233 (2009)

[2] A. Turchanin et al., ACS Nano 5, 3896 (2011)