Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Focused Session: Epitaxial Graphene III
O 22.4: Vortrag
Dienstag, 24. März 2009, 11:45–12:00, SCH 251
Novel 1 nm thin carbon nanosheets — •Andrey Turchanin1, Andre Beyer1, Christoph T. Nottbohm1, Xianghui Zhang1, Rainer Stosch2, Alla Soligubenko3, Joachim Mayer3, Peter Hinze2, Thomas Weimann2, and Armin Gölzhäuser1 — 1Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig — 3Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen, 52074 Aachen
We present a route for the fabrication of novel ultrathin (∼1 nm) carbon films and membranes, whose electrical behavior can be tuned from insulating to conducting. Self-assembled monolayers of biphenyls are cross-linked by electrons, detached from the surfaces and subsequently pyrolized. This transformation was characterized by a variety of complementary spectroscopic and microscopic techniques. Above 1000K, the cross-linked aromatic monolayer forms a mechanically stable graphitic phase consisting of nanosize patches of graphene. The transition is accompanied by a drop of the sheet resistivity from ∼108 to 102 kΩ/sq and a mechanical stiffening of the nanomembranes from ∼10 to 50 GPa. The technical applicability of the nanosheets is discussed.
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[2] W. Eck et al, Adv. Mater., 17, 2583 (2005)
[3] A. Turchanin et al, Appl. Phys. Lett., 90, 053102 (2007)
[4] C. T. Nottbohm et al, Ultramicroscopy, 108, 88 (2008)