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Niobium disulfide nanosheets modified surface plasmon resonance sensors for ultrasensitive detection of mercury ion
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.jallcom.2021.159328
Yue Jia , Yunlong Liao , Zhongfu Li , Houzhi Cai

Mercury ion (Hg2+) can affect the quality of water and cause damage to human health. Therefore, the detection of Hg2+ in water, especially trace Hg2+, is very important. However, the detection limit (approximately 200 pM) of conventional Hg2+ sensors is far lower than the detection limit (7.5 pM) proposed by the US Environmental Protection Agency for measuring Hg2+. Here, we have developed a novel sensor based on niobium disulfide (NbS2)’s high perfect performance. The maximum value of SPR sensitivities approached to 193°∕RIU achieved by coating the NbS2 nanosheets in simulation calculation, which had increased by 38.1% compared with the case without NbS2 overlayer. More importantly, this work also detected the ultra-low concentration of Hg2+ and describes the sensing mechanism of NbS2 based SPR sensors. Surprisingly, these sensors were used to detect mercury and the value of sensitivity is 13.55°∕μM, and detection limit approach 1 pM. NbS2 nanosheets based SPR sensors provided innovative design ideas for the development of ultra-sensitive detection technology.



中文翻译:

二硫化铌纳米片修饰的表面等离子体共振传感器,用于超灵敏检测汞离子

汞离子(Hg 2+)会影响水的质量并损害人体健康。因此,检测水中的Hg 2+尤其是痕量Hg 2+非常重要。但是,传统的Hg 2+传感器的检测极限(约200 pM)远低于美国环境保护局提出的用于测量Hg 2+的检测极限(7.5 pM)。在这里,我们开发了一种基于二硫化铌(NbS 2)的高完美性能的新型传感器。通过在模拟计算中涂覆NbS 2纳米片获得的SPR敏感性最大值接近193°RIU ,与没有NbS的情况相比,增加了38.1%2个覆盖层。更重要的是,这项工作还检测到了Hg 2+的超低浓度,并描述了基于NbS 2的SPR传感器的传感机制。出乎意料的是,这些传感器用于检测汞,灵敏度值为13.55°∕μM,检测极限接近1 pM。基于NbS 2纳米片的SPR传感器为超灵敏检测技术的发展提供了创新的设计思路。

更新日期:2021-03-03
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