Graphene Oxide Modified Electrodes for Dopamine Sensing

Figure 2

(a) Schematic drawing of electrochemical oxidized AA, DA, and UA on CNNS-GO/GCE. (b) CV of 0.01 M PBS with pH 4.0 on CNNS-GO/GCE (A), CV of 2 mM AA, 0.1 mM DA, and 0.5 mM UA in 0.01 M PBS with pH 4.0 on bare GCE (B), CNNS/GCE (C), GO/GCE (D), and CNNS-GO/GCE (E) [78]. (c) Schematic illustration of the developed graphene quantum dots based fluorescence sensing system for DA detection [79]. (d) Fluorescence emission spectra of the sensing system after addition of various concentrations of DA ((A)–(I): 0, 0.25, 1, 2.5, 5, 10, 25, 50, and 100 μM). Inset: the relationship between the florescence quenching and the concentration of DA (0.25, 1, 2.5, 5, 10, 25, and 50 μM).

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