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Graphene Oxide-Silver Nanowire Nanocomposites for Enhanced Sensing of Hg2+
M.T. Rahman, M.F. Kabir, A. Gurung, K.M. Reza, R. Pathak, N. Ghimire, A. Baride, Z. Wang, , Q. Qiao
Published in American Chemical Society
Volume: 2
Issue: 8
Pages: 4842 - 4851
We demonstrate a highly sensitive and selective sensing platform for the electrochemical detection of Hg2+ in aqueous media. A graphene oxide (GO) and silver nanowire (AgNW) nanocomposites modified platinum (Pt) electrode has been applied to determine Hg2+ 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 Hg2+. 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 Hg2+. The detection limit of the GO-AgNW nanocomposites modified electrode toward Hg2+ 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 Hg2+ against other interfering heavy metal ions such as Pb2+, Cd2+, Cu2+, Na+, and Ag+. In addition, the sensor exhibits a high repeatability and reproducibility. The sensor is employed for the detection of Hg2+ in tap water samples with an outstanding performance, suggesting it is a very promising platform for on-site monitoring of Hg2+ in water. Copyright © 2019 American Chemical Society.
About the journal
JournalData powered by TypesetACS Applied Nano Materials
PublisherData powered by TypesetAmerican Chemical Society