Graphene and carbon quantum dots electrochemistry

Chee Shan Lim, Katerina Hola, Adriano Ambrosi, Radek Zboril, Martin Pumera

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalElectrochemistry Communications
Volume52
DOIs
Publication statusPublished - 2015 Mar

All Science Journal Classification (ASJC) codes

  • Electrochemistry

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