Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 81: Graphene: Transport

HL 81.6: Talk

Thursday, March 17, 2011, 16:00–16:15, POT 151

Scanning irradiation of polymers by low-energy ions — •Stefan Lücken, Yuri Koval, and Paul Müller — Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany

We have already shown that nearly any polymer can be graphitized by low-energy ion irradiation. The surface consists of nanometer-sized graphite/graphene flakes [1]. In order to increase the size of these flakes and to enhance the conductivity of the graphitized surface, we introduce a new method of irradiation. A narrow ion beam is scanned gradually across the polymer surface. Using conductivity vs. temperature measurements, we compare samples produced with different parameters of irradiation, like fluence of ions, speed of scanning, and temperature of the samples. We have observed that a decreased width of the beam correlates to an enhanced conductivity of the surface both at room temperature and at 4.2 K. Compared to flood irradiation the conductivity becomes significantly less temperature dependent. We expect further improvements by optimizing beam width and scanning speed.

[1] I. Lazareva, Y. Koval, M. Alam, S. Strömsdörfer, P. Müller, Appl. Phys. Lett. 90, 262108 (2007).