Optical fiber plasmonic sensor for the ultrasensitive detection of copper (II) ion based on trimetallic Au@AgPt core-shell nanospheres

Qing Huang, Wenjie Zhu, Yong Wang, Zhao Deng, Zhi Li, Jiankun Peng, Dajuan Lyu, Elfed Lewis, Minghong Yang

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number128480
JournalSensors and Actuators, B: Chemical
Volume321
DOIs
Publication statusPublished - 15 Oct 2020

Keywords

  • Au@AgPt nanospheres
  • Copper (II) ion (Cu)
  • Localized surface plasmon resonance (LSPR)
  • Optical fiber sensor
  • Polyethylenimine (PEI)
  • Refractive index

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