Figure 6From: Fabrication, electrical characterization, and detection application of graphene-sheet-based electrical circuitsChange of relative conductance of the RGOS-based electrical circuit against the concentration of (a) Cu2+solutions, (b) Cu2+. The inset images show the real-time current recordings of the RGOS-based electrical circuit with the addition of DI water and 10 nM Cu2+ solution, respectively.Back to article page