异质结
材料科学
检出限
电化学气体传感器
电化学
离子
纳米颗粒
电极
纳米结构
分析化学(期刊)
纳米技术
光电子学
化学
环境化学
色谱法
物理化学
有机化学
作者
Yuhui Liu,Jinyu Zhao,Ke Zhao,Shuang Zhang,Ran Tian,Mengyu Chang,Yingcai Wang,Xiaoyan Li,Liya Ge,Grzegorz Lisak
标识
DOI:10.1016/j.jece.2023.111563
摘要
In this study, a highly sensitive electrochemical sensor was developed for the detection of mercury ions in wastewater samples. The sensor was constructed using MoS2/Au heterojunction nanostructures, which involved depositing plasmonic Au nanoparticles onto MoS2 nanosheets on screen-printed carbon electrodes. The MoS2/Au-SPCE sensor demonstrated outstanding electrochemical sensing capabilities, attributed to the emergence of a mid-gap state across the Fermi level. This state arises from the interaction between the Au 5d (Au, +1 charge state) and Mo 3d (MoS2, +4 charge state) orbitals. This performance was superior to that of single Au nanoparticles and MoS2. The sensor showed high sensitivity in detecting Hg(II) ions with a wide linear range from 0.02 ppm to 0.0004 ppb and a LOD of 0.0004 ppb. The developed sensor was effectively applied for the detection of Hg(II) ions in factory wastewater and other samples. The MoS2/Au-SPCE sensor was successfully used to detect low concentrations of 565.0 ppb and 92.0 ppb Hg(II) in the investigated samples. This study introduces a new electrochemical sensor, leveraging the MoS2/Au heterostructures, meticulously crafted for the intricate sensing of Hg(II) ions
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