We demonstrate a highly sensitive and selective sensing platform for the electrochemical detection of Hg 2+ in aqueous media. A graphene oxide (GO) and silver nanowire (AgNW) nanocomposites modified platinum (Pt) electrode has been applied to determine Hg 2+ by using square-wave anodic stripping voltammetry (SWASV). The synergistic effect of graphene oxide and conductive AgNW greatly facilitates faster electron transport and sensing behavior for Hg 2+ . Under the optimum conditions, the sensor shows a high sensitivity of ∼0.29 μA/nM and a linear response in the range 1−70 nM toward Hg 2+ . The detection limit of the GO−AgNW nanocomposites modified electrode toward Hg 2+ is ∼0.1 nM, which is significantly less than the safety limit defined by the World Health Organization. The sensor has an excellent selective response to Hg 2+ against other interfering heavy metal ions such as Pb 2+ , Cd 2+ , Cu 2+ , Na + , and Ag + . In addition, the sensor exhibits a high repeatability and reproducibility. The sensor is employed for the detection of Hg 2+ in tap water samples with an outstanding performance, suggesting it is a very promising platform for on-site monitoring of Hg 2+ in water.

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