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(A) High-resolution transmission electron microscopy (HRTEM) image of graphene oxide nanosheets; (B,C) TEM images of reduced graphene oxide nanosheets modified with gold nanoparticles. Reproduced with permission from the authors of [111], copyright 2015, Elsevier. (D) EIS response of (a) bare, (b) capture DNA, (c) aptamer hybridized to capture DNA, (d) rGO/AuNP/DNA2 bound to the aptamer, reproduced with permission from the authors of [11], copyright 2014, Elsevier.
