Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Graphene I

O 29.2: Vortrag

Dienstag, 15. März 2011, 11:30–11:45, WIL B321

Graphene flakes growth study by ARPES — •Marin Petrović¹, Iva Šrut¹, Petar Pervan¹, Sven Runte², Carsten Busse², Thomas Michely², and Marko Kralj¹ — ¹Institut za fiziku, Zagreb, Croatia — ²II. Physikalisches Institut, Köln, Germany

A well established route for the large-scale production of graphene is chemical vapor phase deposition (CVD) growth on various metal substrates [1]. However, in order to obtain highly oriented graphene covering the entire Ir(111) surface one needs to combine the temperature programmed growth (TPG) with CVD [2]. Moreover, by using just the TPG procedure, it is possible to grow graphene flakes of various average sizes, depending on the growth parameters used. The overall area of Ir(111) sample covered with flakes after each TPG cycle is always the same, regardless of the temperature [3]. Here we report a study of graphene flakes obtained by ethene decomposition on Ir(111) using the TPG procedure at various temperatures. As the decomposition temperature of the preadsorbed ethene increases, the average size of the flakes increases as well. Based on angle-resolved photoemission spectroscopy (ARPES), in particular the Dirac cone intensity analysis, we characterise graphene flakes on Ir(111) of varying sizes and compare these results with known STM and XPS data.

[1] X. Li et al., Science 324, 1312 (2009)

[2] R. von Gastel et al., Appl. Phys. Lett. 95, 121901 (2009)

[3] J. Coraux et al., New J. Phys. 11, 023006 (2009)