Open AccessConductance enhancement phenomenon of graphene ribbons on highly oriented pyrolytic graphite surfaces studied by scanning probe microscopy
Author(s) -
Qi Wang,
Zhao Hua-Bo,
Zhaohui Zhang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3059
Subject(s) - graphene , highly oriented pyrolytic graphite , materials science , scanning tunneling microscope , pyrolytic carbon , conductance , graphite , scanning electron microscope , conductive atomic force microscopy , nanotechnology , condensed matter physics , composite material , atomic force microscopy , chemistry , physics , organic chemistry , pyrolysis
Based on comparative observations with the conducting atomic force microscope and the scanning tunneling microscopeconductance enhancement phenomenon of graphene ribbons on highly oriented pyrolytic graphite surfaces has been studied. According to measured data of local resistance on the samplesthe phenomenon is attributed to the state of point contact of the conducting tip on the sample surface. It was demonstrated that the conductance of the point contact is proportional to the local density of electrons in the contacting surface areaso we conclude that the conductance enhancement phenomenon results from the high density of electrons on the graphene ribbons.