Near-edge x-ray absorption fine-structure investigation of graphene.
نویسندگان
چکیده
We report the near-edge x-ray absorption fine-structure (NEXAFS) spectrum of a single layer of graphite (graphene) obtained by micromechanical cleavage of highly ordered pyrolytic graphite on a SiO2 substrate. We utilized a photoemission electron microscope to separately study single-, double-, and few-layers graphene samples. In single-layer graphene we observe a splitting of the pi resonance and a clear signature of the predicted interlayer state. The NEXAFS data illustrate the rapid evolution of the electronic structure with the increased number of layers.
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عنوان ژورنال:
- Physical review letters
دوره 102 9 شماره
صفحات -
تاریخ انتشار 2008