Direct Voltammetric Detection of DNA and pH Sensing on Epitaxial Graphene: An Insight into the Role of Oxygenated Defects

We found that anodized epitaxial graphene, consisting of oxygen-related defects, is a superior biosensing platform for the detection of nucleic acids, uric acids, dopamine, and ascorbic acids

Cheng Xiang Lim; Hui Ying Hoh; Priscilla Kailian Ang; Kian Ping Loh

2010

Scholarcy highlights

  • In this paper, we carried out detailed electrochemical studies of epitaxial graphene using inner-sphere and outer-sphere redox mediators
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  • We found that anodized EG, consisting of oxygen-related defects, is a superior biosensing platform for the detection of nucleic acids, uric acids, dopamine, and ascorbic acids
  • An anodized EG voltammetric sensor can realize the simultaneous detection of all four DNA bases in double stranded DNA without a prehydrolysis step, and it can differentiate single stranded DNA from dsDNA
  • Our results show that graphene with high edge plane defects, as opposed to pristine graphene, is the choice platform in high resolution electrochemical sensing

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