Step like surface potential on few layered graphene oxide
EntityUAM. Departamento de Física de la Materia Condensada
PublisherAmerican Institute of Physics
10.1063/1.4773357Applied Physics Letters 101.26 (2012): 263109
ISSN0003-6951 (print); 1077-3118 (online)
SubjectsSurface charge; Graphene; Atomic force microscopy; Gold; Graphite; Física
NoteThe following article appeared in Applied Physics Letters 101.26 (2012): 263109 and may be found at http://scitation.aip.org/content/aip/journal/apl/101/26/10.1063/1.4773357
Rights© 2012 American Institute of Physics.
We report surface potential maps of few layered graphene oxide films on different substrates. Kelvin probe force microscopy images reveal that the surface potential decreases in steps with increasing number of layers on the substrate until five layers are reached, where it saturates to a constant value. This intrinsic behavior is smeared out in the presence of ambient humidity where the surface potential is shielded by the presence of a thin water layer on the surface. This effect can be exploited to quickly determine the number of layers of graphene oxide on a substrate
Google Scholar:Jaafar Ruiz-Castellanos, Miriam - Lopez-Polin Peña, Guillermo - Gómez-Navarro González, Cristina - Gómez Herrero, Julio
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