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Title: Electrochemistry of folded graphene edges
Authors: Ambrosi, Adriano
Bonanni, Alessandra
Pumera, Martin
Keywords: DRNTU::Engineering::Materials
Issue Date: 2011
Source: Ambrosi. A., Bonanni A., & Pumera, M. (2011). Electrochemistry of Folded Graphene Edges. Nanoscale, 3(5), 2256-2260.
Series/Report no.: Nanoscale
Abstract: There is enormous interest in the investigation of electron transfer rates at the edges of graphene due to possible energy storage and sensing applications. While electrochemistry at the edges and the basal plane of graphene has been studied in the past, the new frontier is the electrochemistry of folded graphene edges. Here we describe the electrochemistry of folded graphene edges and compare it to that of open graphene edges. The materials were characterized in detail by high-resolution transmission electron microscopy, Raman spectroscopy, high-resolution X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry. We found that the heterogeneous electron transfer rate is significantly lower on folded graphene edges compared to open edge sites for ferro/ferricyanide, and that electrochemical properties of open edges offer lower potential detection of biomarkers than the folded ones. It is apparent, therefore, that for sensing and biosensing applications the folded edges are less active than open edges, which should then be preferred for such applications. As folded edges are the product of thermal treatment of multilayer graphene, such thermal procedures should be avoided when fabricating graphene for electrochemical applications.
ISSN: 2040-3372
DOI: 10.1039/C1NR10136F
Rights: © 2011 The Royal Society of Chemistry.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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