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Tailoring Amino‐Functionalized Graphitic Carbon‐Encapsulated Gold Core/Shell Nanostructures for the Sensitive and Selective Detection of Copper Ions
Author(s) -
Hu Rui,
Furukawa Taiki,
Wang Xiangke,
Nagatsu Masaaki
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201702232
Subject(s) - materials science , nanoparticle , surface plasmon resonance , copper , colloidal gold , ion , coating , plasmon , nanostructure , graphene , absorption (acoustics) , metal ions in aqueous solution , surface modification , carbon fibers , nanotechnology , chemical engineering , metal , composite number , organic chemistry , composite material , optoelectronics , chemistry , metallurgy , engineering
The effective transfer of strong electromagnetic field from the gold core through the coating shell represents the most significant challenge for the applications of plasmonic nanoparticles. This study applies a one‐step arc discharge method to synthesize graphitic carbon‐encapsulated gold nanoparticles (Au@G NPs) functionalized with amino groups uniformly via adding NH 3 into He background gas. By tailoring the coating shell into few‐layered graphene, a strong localized surface plasmon resonance (LSPR) absorption band is achieved. The NH 3 introduces H radicals to strengthen the LSPR characteristic by etching the coating graphitic shell, as well as provides dissociated NH or NH 2 species to functionalize the surfaces with amino groups. With an LSPR‐based colorimetric method, it is demonstrated that trace Cu 2+ ions can be detected rapidly with excellent sensitivity (as low as 10 × 10 ‐9 m linearly) and selectivity against other metal ions (Na + , K + , Mg 2+ , Ca 2+ , Co 2+ , Fe 2+ , Cd 2+ , Pb 2+ , and Hg 2+ ions) by amino‐functionalized Au@G NPs in water samples.