Reflection electron energy loss spectrum of single layer graphene measured on a graphite substrate

Reflection electron energy loss spectra (REELS) have been measured on a highly oriented pyrolytic graphite (HOPG) sample. Two spectra were measured for different energies, 1600eV, being more sensitive to the bulk and 500eV being more sensitive to the surface. The energy loss distributions for a sing...

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Bibliographic Details
Published in:Surface science 2015-05, Vol.635, p.L1-L3
Main Authors: Werner, Wolfgang S.M., Bellissimo, Alessandra, Leber, Roland, Ashraf, Afshan, Segui, Silvina
Format: Article
Language:English
Subjects:
68.49.Jk
79.20.-m
79.60.-i
Energy measurement
Energy use
Graphene
Graphite
Multilayers
Perturbation
Reflection
Spectra
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Summary:Reflection electron energy loss spectra (REELS) have been measured on a highly oriented pyrolytic graphite (HOPG) sample. Two spectra were measured for different energies, 1600eV, being more sensitive to the bulk and 500eV being more sensitive to the surface. The energy loss distributions for a single surface and bulk excitation were extracted from the two spectra using a simple decomposition procedure. These single scattering loss distributions correspond to electron trajectories with significantly different penetration depths and agree with energy loss spectra measured on free standing single layer graphene and multilayer graphene (i.e. graphite). This result implies that for a layered electron gas (LEG) material, the number of layers which responds in a correlated fashion to an external perturbation is determined by the depth range penetrated by the external perturbation, and not by the number of layers actually present in the specimen.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2014.12.016