Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128480
Keywords
Localized surface plasmon resonance (LSPR); Au@AgPt nanospheres; Refractive index; Optical fiber sensor; Polyethylenimine (PEI); Copper (II) ion (Cu2+)
Funding
- National Natural Science Foundation of China, NSFC [61575151]
- Science Foundation Ireland under the MaREI Centre research programme [SFI/12/RC/2302_P2]
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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 resulting 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.
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