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Chemically modified electrodes: The fast and effective immobilization of graphene on a Au electrode has been demonstrated by exploiting Au–S interactions between Au and a thiolated single-stranded DNA as well as π–π stacking interactions between graphene and DNA bases (see figure). The resultant modified electrode exhibits high sensitivity and selectivity in dopamine detection with a detection limit of 0.8 nM in the presence of ascorbic acid.
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Wang et al. (2011) studied this question.
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