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Optical fiber plasmonic sensor for the ultrasensitive detection of copper (II) ion based on trimetallic Au@AgPt core-shell nanospheres
Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.snb.2020.128480
Qing Huang , Wenjie Zhu , Yong Wang , Zhao Deng , Zhi Li , Jiankun Peng , Dajuan Lyu , Elfed Lewis , Minghong Yang

This article presents for the first time an ultrasensitive localized surface plasmon resonance (LSPR) sensor system based on multimode-singlemode-multimode fiber (MMF-SMF-MMF) structure for the accurate measurement of copper (II) Ion (Cu2+). Citrate-stabilized Au@AgPt core-shell nanospheres (NSs) with a rough AgPt alloy outer shell were synthesized in house, and then adhered onto the sensing section of MMF-SMF-MMF structure through silane coupling agent. Finally, the Au@AgPt NSs-coated optical fiber probe surface was covered with a layer of PEI as the chelating agent for specific Cu2+ trapping. The detection process of Cu2+ is conducted by monitoring the resonance intensity variation of the transmission spectrum, which is due to the local refractive index changes result- ing from the specific interactions between Cu2+ in solution and PEI immobilized on the sensor surface. The proposed PEI-Au@AgPt NSs modified fiber sensor achieved an ultralow Cu2+ detection level down to 10−16 mol/L. The facile fabrication, pollution-free, high sensitivity and cost-effectiveness of the optical fiber sensor system make it rather promising for the precise Cu2+ monitoring in a wide range of biological application scenarios.



中文翻译:

基于三金属Au @ AgPt核-壳纳米球的铜离子(II)超灵敏检测的光纤等离子体传感器

本文首次提出了一种基于多模单模多模光纤(MMF-SMF-MMF)结构的超灵敏局部表面等离子体共振(LSPR)传感器系统,用于精确测量铜(II)离子(Cu 2+)。在室内合成了具有粗糙的AgPt合金外壳的柠檬酸盐稳定的Au @ AgPt核壳纳米球(NSs),然后通过硅烷偶联剂粘附到MMF-SMF-MMF结构的传感部分上。最后,Au @ AgPt NSs涂层的光纤探头表面覆盖有一层PEI作为螯合剂,用于特定的Cu 2+捕获。Cu 2+的检测过程通过监测透射光谱的共振强度变化来进行检测,这是由于溶液中Cu 2+与固定在传感器表面上的PEI之间的特定相互作用导致的局部折射率变化所致。提出的PEI-Au @ AgPt NSs改性纤维传感器实现了低至10 -16 mol / L的超低Cu 2+检测水平。光纤传感器系统的制造简便,无污染,高灵敏度和成本效益使其在广泛的生物应用场景中用于精确的Cu 2+监测具有相当大的希望。

更新日期:2020-06-26
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