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Title
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Luminescence, patterned metallic regions, and photon-mediated electronic changes in single-sided fluorinated graphene sheets
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Author
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Abstract
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| 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 similar to 6 eV and a metastable one, induced by UV irradiation, with a band gap of similar to 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. |
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Language
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English
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Source (journal)
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ACS nano. - -
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Publication
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2014
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ISSN
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1936-0851
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DOI
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10.1021/NN501163C
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Volume/pages
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8
:8
(2014)
, p. 7801-7808
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ISI
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000340992300025
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Full text (Publisher's DOI)
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