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Fig. 4 compares square wave anodic stripping voltammetric  (SWASV) response for Hg2+ obtained at Au electrodes modified withgraphene oxide (black curve) and with cysteamine-functionalizedgraphene (red curve). In this case, both electrodes were first immersedinto aqueous solution of Hg2+ with the same concentration for 2 h, taken out of the solution, and rinsed with water. The electrodes werethen immersed into 0.10 M HCl solution containing no Hg2+ and were polarized at -0.10 V for 10 s before square wave voltammetric measurements. In an independent experiment, we found that the reduction at -0.10 V for 10 s was enough to reduce Hg2+  tethered onto the cysteamine-functionalized graphene surface.
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