Scanning tunneling microscopy of a stage-1CuCl2graphite intercalation compound
- 15 October 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (12), 7524-7529
- https://doi.org/10.1103/physrevb.42.7524
Abstract
We report a scanning-tunneling-microscope (STM) study of a stage-1 graphite intercalation compound (GIC) of approximate stoichiometry . When the sample bias is positive with respect to the tip, we observe a hexagonal symmetry in which all the atoms of the graphite surface plane are imaged. This is in contrast to the threefold symmetry usually seen in atomic-resolution STM images of highly oriented pyrolytic graphite (HOPG), which we also observe on a reference sample of HOPG. The threefold symmetry is attributed to the ABAB stacking of the atomic layers in HOPG. In GIC’s, this stacking sequence is interrupted by the intercalate layer, so that for the stage-1 compound all carbon atoms in the plane become equivalent, and sixfold symmetry develops. When the sample is biased negatively with respect to the tip, we observe a strikingly different STM image for the GIC; we believe that the pattern in this case is mainly due to the intercalate layer and the change in the electronic structure of graphite resulting from the presence of the intercalate layer. We also observe a reduction in the corrugation amplitude, between carbon-atom sites and the centers of the hexagonal nets, on the GIC relative to the HOPG.
Keywords
This publication has 26 references indexed in Scilit:
- Multiple-tip interpretation of anomalous scanning-tunneling-microscopy images of layered materialsPhysical Review B, 1987
- Scanning tunneling microscopy—from birth to adolescenceReviews of Modern Physics, 1987
- A study of graphite surface with stm and electronic structure calculationsSurface Science, 1987
- Scanning tunneling microscopyJournal of Applied Physics, 1987
- Contamination-mediated deformation of graphite by the scanning tunneling microscopePhysical Review B, 1986
- Tunneling microscopy study of the graphite surface in air and waterPhysical Review B, 1986
- Interatomic Forces in Scanning Tunneling Microscopy: Giant Corrugations of the Graphite SurfacePhysical Review Letters, 1986
- Anomalous Corrugations in Scanning Tunneling Microscopy: Imaging of Individual StatesPhysical Review Letters, 1986
- Imaging in real time with the tunneling microscopeApplied Physics Letters, 1986
- Voltage-dependent scanning-tunneling microscopy of a crystal surface: GraphitePhysical Review B, 1985