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Graphene Oxide-Silver Nanowire Nanocomposites for Enhanced Sensing of Hg<sup>2+</sup>
Date Issued
2019-08-23
Author(s)
Rahman, Md Tawabur
Kabir, Md Faisal
Gurung, Ashim
Reza, Khan Mamun
Pathak, Rajesh
Ghimire, Nabin
Baride, Aravind
Wang, Zhenqiang
Kumar, Mahesh
Qiao, Qiquan
DOI
10.1021/acsanm.9b00789
Abstract
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.