Surface composition of graphite intercalation compounds |
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| Institution: | 1. CAPS Laboratory, Department of Mechanical and Process Engineering, ETH Zürich, Switzerland;2. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway |
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| Abstract: | We present Auger spectroscopy measurements on graphite intercalation compounds, for donor (cesium) and for acceptor (MnCl2) intercalants. The surface composition of both compounds is steeply different from their bulk composition. In the case of high stage cesium compounds, a segregation of the intercalant towards the surface layers is observed, leading to an increased concentration between the first two graphite layers (CsC8 or CsC6). On the opposite, an intercalant depletion between these first layers is observed for the first stage (MnCl2)C6 compounds.Both effects are explained by the screening of surface states, which involves an electrostatic energy of the same order of magnitude as the intercalant chemical potential. This is thus sufficient to allow the local intercalant concentration to change. |
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