TY - JOUR
T1 - Optical fiber plasmonic sensor for the ultrasensitive detection of copper (II) ion based on trimetallic Au@AgPt core-shell nanospheres
AU - Huang, Qing
AU - Zhu, Wenjie
AU - Wang, Yong
AU - Deng, Zhao
AU - Li, Zhi
AU - Peng, Jiankun
AU - Lyu, Dajuan
AU - Lewis, Elfed
AU - Yang, Minghong
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/10/15
Y1 - 2020/10/15
N2 - 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.
AB - 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.
KW - Au@AgPt nanospheres
KW - Copper (II) ion (Cu)
KW - Localized surface plasmon resonance (LSPR)
KW - Optical fiber sensor
KW - Polyethylenimine (PEI)
KW - Refractive index
UR - http://www.scopus.com/inward/record.url?scp=85087214410&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2020.128480
DO - 10.1016/j.snb.2020.128480
M3 - Article
AN - SCOPUS:85087214410
SN - 0925-4005
VL - 321
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
M1 - 128480
ER -