Graphene and carbon quantum (QDs) dots exhibit interesting and well-defined properties owing to their quantum confinement. In this work, graphene QDs (G-QDs) and carbon QDs of size ~ 6 nm and ~ 2 nm, respectively, were prepared and their potential uses in electrochemistry and electrochemical sensing were subsequently investigated. It was discovered that the C-QDs surface displayed a faster electron transfer rate compared to the G-QDs following analyses with the ferro/ferricyanide redox probe. Studies were also carried out with redox biomarkers such as uric acid (UA) and ascorbic acid (AA), and it was found that while the C-QDs displayed electrocatalytic properties toward the oxidation of both UA and AA, the G-QDs seemed to only have an impact on AA, from the decrease in the oxidation peak potential. This work provides direct electrochemical comparison of the two latest frontiers of carbon nanomaterials and opens the way for their electrochemical sensing applications.
Bibliographical noteFunding Information:
M.P. acknowledges Tier 2 grant ( MOE2013-T2-1-056 ) from Ministry of Education, Singapore . R. Z. and K. H. gratefully acknowledge the support by project LO1305 of the Ministry of Education, Youth and Sports of the Czech Republic . Financial support from the Internal Student Grant (IGA) of Palacký University in Olomouc, Czech Republic (IGA_PrF_ 2014023 ) is also gratefully acknowledged.
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