Electrochemistry of Graphene Flake Electrodes: Edge and Basal Plane Effect for Biosensing

摘要

In order to study the properties of the graphene basal plane and edge specifically, the graphene flakes(GFs) were selectively masking with a non-conducting polymer to access the basal plane and edgeonly. An electro-exfoliation process was used to introduce functional groups on the surface of GFsbasal plane and edge electrodes. The morphologies, structure defects, functional groups and surfacestates of the electrodes were studied by SEM, Raman and XPS. Depending on the electrochemical3+ species (Fe , UA and AA) used we found that the GFs basal plane and edge carbon atoms could play adifferent role in electrochemical sensors. Furthermore, the oxygen groups induced in the electrodes,were also influenced the electrochemical properties of the GFs electrodes.