Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Graphene (organized by O)

TT 50.19: Poster

Tuesday, March 17, 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 Gürlü¹ — ¹Istanbul 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.