Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Graphene (organized by O)

TT 50.19: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Structural defects on swift heavy ion irradiated graphitic surfaces — •Cem Kincal1, Dilek Yildiz1, Deniz Aşan Acar1, Clara Grygiel2, Cornelis J. van der Beek3, and Oğuzhan Gürlü11Istanbul Technical University, Istanbul, Turkey — 2Université de Caen, Caen , France — 3Ecole Polytechnique, Palaiseau, France

Hillock like structures on Highly Oriented Pyrolytic Graphite (HOPG) surfaces due to perpendicular swift heavy ion (SHI) irradiation were previously reported. Our results showed that structures that form on HOPG surfaces due to uranium SHI irradiation in perpendicular geometry have a variety of shapes and sizes rather than just being hillock like. Most of such defects were observed to be distributed on a line rather than being localized to a single point. On the other hand, SHI irradiation of moiré zones on HOPG surfaces under grazing incidence did neither show destruction of the graphene layer generating the moiré pattern, nor any unzipping of the graphene as shown to happen on SHI irradiation of graphene crystals on dielectric substrates. Rather the defects forming as a result of grazing incidence irradiation were comet like both on pristine HOPG samples as well as on moiré domains. Moreover, our irradiation experiments on different graphitic samples showed variations in the structures of the induced defects on the surfaces depending on the crystal quality. Comparison of perpendicular irradiation defects on HOPG terraces to the ones on the moiré domains showed considerable differences.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin