期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 8, 页码 4842-4851出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b00789
关键词
graphene oxide; nanowire; nanocomposites; Hg sensor; electrochemical
资金
- EDA University Center [ED18DEN3030025]
- NSF-MRI [1428992]
- NSF I-Corps [1906755]
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 similar to 0.29 mu A/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 similar to 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.
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