Tailoring Amino‐Functionalized Graphitic Carbon‐Encapsulated Gold Core/Shell Nanostructures for the Sensitive and Selective Detection of Copper Ions

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 nanoparti...

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Bibliographic Details
Published in:Advanced functional materials 2017-09, Vol.27 (36), p.n/a
Main Authors: Hu, Rui, Furukawa, Taiki, Wang, Xiangke, Nagatsu, Masaaki
Format: Article
Language:English
Subjects:
Absorption spectra
Carbon dioxide
Coating
Cobalt
Colorimetry
Copper
Core-shell structure
core/shell nanoparticles
Electric arcs
Electromagnetic fields
Encapsulation
Gold
Lead
Materials science
Mercury (metal)
Nanoparticles
Selectivity
structure–property relationships
surface modifications
surface plasmon resonance
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Summary: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 NH3 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 NH3 introduces H radicals to strengthen the LSPR characteristic by etching the coating graphitic shell, as well as provides dissociated NH or NH2 species to functionalize the surfaces with amino groups. With an LSPR‐based colorimetric method, it is demonstrated that trace Cu2+ ions can be detected rapidly with excellent sensitivity (as low as 10 × 10‐9m linearly) and selectivity against other metal ions (Na+, K+, Mg2+, Ca2+, Co2+, Fe2+, Cd2+, Pb2+, and Hg2+ ions) by amino‐functionalized Au@G NPs in water samples. Uniformly amino group‐functionalized graphitic carbon‐encapsulated gold nanoparticles are fabricated by a one‐step arc discharge method, and a strong localized surface plasmon resonance property is introduced by tailoring the coating shell into few‐layered graphene. These nanoparticles can be applied to detect trace Cu2+ ions rapidly with excellent sensitivity (as low as 10 × 10−9m linearly) and selectivity in water samples.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201702232