石墨烯
材料科学
检出限
电化学气体传感器
纳米复合材料
氧化物
电极
阳极溶出伏安法
电化学
水溶液
纳米技术
分析化学(期刊)
化学
色谱法
物理化学
冶金
作者
Md Tawabur Rahman,Md. Faisal Kabir,Ashim Gurung,Khan Mamun Reza,Rajesh Pathak,Nabin Ghimire,Aravind Baride,Zhenqiang Wang,Mahesh Kumar,Qiquan Qiao
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2019-07-19
卷期号:2 (8): 4842-4851
被引量:65
标识
DOI:10.1021/acsanm.9b00789
摘要
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.
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