Florina Pogacean
Graphene-based materials were prepared by exfoliation of graphite rod with pulses of current. After preparation, the materials were used to modify two glassy carbon (GC) electrodes, denoted GC/EGr-1 and GC/EGr-2, respectively. The performances of each electrode toward Sunset Yellow (SY) detection were tested in laboratory solutions (pH 6 PBS) containing increasing concentrations of SY (3×10−7–1×10−4 M). The sensitivities, linear ranges and the limits of detection of the two electrodes were different. Hence, in the case of the electrode covered with graphene prepared in strong acidic solution (GC/EGr-1) the sensitivity was 0.017 A•M−1, the linear range between 6×10−6 and 1×10−4 M, the LOD was 1.8×10−6 M. In contrast, the electrode covered with the material prepared in weak acidic solution (GC/EGr-2) has higher sensitivity (0.021 A•M−1) wider linear range (1×10−6–1×10−4 M) and lower LOD (3×10−7 M).
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