DataVXACS NanoPaper
journal article·2014-08-26

Luminescence, Patterned Metallic Regions, and Photon-Mediated Electronic Changes in Single-Sided Fluorinated Graphene Sheets

Andrew Leigh Walter, Hasan Sahin, Ki-Joon Jeon, Aaron Bostwick, Seyda Horzum, Roland Koch, Florian Speck, Markus Ostler, Peter Nagel, Michael Merz, Stefan Schupler, Luca Moreschini, Young Jun Chang, Thomas Seyller, Francois M. Peeters, Karsten Horn, Eli Rotenberg

ACS Nano· Volume 8· Issue 8
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Source abstract

Abstract

Single-sided fluorination has been predicted to open an electronic band gap in graphene and to exhibit unique electronic and magnetic properties; however, this has not been substantiated by experimental reports. Our comprehensive experimental and theoretical study of this material on a SiC(0001) substrate shows that single-sided fluorographene exhibits two phases, a stable one with a band gap of ∼6 eV and a metastable one, induced by UV irradiation, with a band gap of ∼2.5 eV. The metastable structure, which reverts to the stable "ground-state" phase upon annealing under emission of blue light, in our view is induced by defect states, based on the observation of a nondispersive electronic state at the top of the valence band, not unlike that found in organic molecular layers. Our structural data show that the stable C2F ground state has a "boat" structure, in agreement with our X-ray magnetic circular dichroism data, which show the absence of an ordered magnetic phase. A high flux of UV or X-ray photons removes the fluorine atoms, demonstrating the possibility of lithographically patterning conducting regions into an otherwise semiconducting 2D material.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsMaterials processing

OpenAlex topics: Graphene research and applications · Fullerene Chemistry and Applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Donostia International Physics Centre, Paseo Manuel de Lardizabal, 4, 20018 Donostia-San Sebastian, Spain

Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium

Department of Environmental Engineering, INHA University, Incheon 402-751, Korea

Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany

Institut für Festkörperphysik, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany

Department of Physics, University of Seoul, Seoul 130-743, Korea

Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany.

Funding

European Science Foundation · Deutsche Forschungsgemeinschaft · Inha University · Fonds Wetenschappelijk Onderzoek · Max-Planck-Gesellschaft · Centro de Física de Materiales, San Sebastian, Spain

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