Utilizing Ag–Au core-satellite structures for colorimetric and surface-enhanced Raman scattering dual-sensing of Cu (II)

This study develops a dual-channel colorimetric and surface-enhanced Raman scattering (SERS) strategy for detection of Cu2+ utilizing Ag–Au core-satellite nanostructures. 4-mercaptobenzoic acid (MBA) modified Ag nanoparticles (AgNPs@MBA) and 4-mercaptopyridine (Mpy) capped AuNPs (GNPs@Mpy) are first...

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Veröffentlicht in:Biosensors & bioelectronics 2020-07, Vol.159, p.112192, Article 112192
Hauptverfasser: Guo, Yanyan, Li, Dan, Zheng, Siqing, Xu, Niwei, Deng, Wei
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Sprache:eng
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Zusammenfassung:This study develops a dual-channel colorimetric and surface-enhanced Raman scattering (SERS) strategy for detection of Cu2+ utilizing Ag–Au core-satellite nanostructures. 4-mercaptobenzoic acid (MBA) modified Ag nanoparticles (AgNPs@MBA) and 4-mercaptopyridine (Mpy) capped AuNPs (GNPs@Mpy) are first designed via metal-sulfur bonds, respectively. Benefiting from the Cu2+-triggered NPs self-aggregation, the dispersion of AgNPs-GNPs (AgNPs@MBA + GNPs@Mpy) is turned into AgNPs-Cu2+-GNPs core-satellite structures. Because of the presence of pyridyl nitrogen and carboxy group which have specific coordination ability towards Cu2+, induces a certain aggregation of NPs. As well it can be obviously discerned by the visual assay and easily captured by SERS analysis. The UV–Vis method exhibits good linearity in the ranging from 0.1 μM-200 μM for Cu2+, while SERS method displays good linear response from 1 pM to 100 μM. The detection limit of Cu2+ is 0.032 μM by colorimetry and 0.6 pM by SERS method, which is significantly lower than the acceptable limit of Cu2+ in drinking water (20 μM) set by the US EPA. Furthermore, colorimetric and SERS assay based on AgNPs-Cu2+-GNPs core-satellite structures is used to determine Cu2+ in various waters and soils, and the detection results are consistent with the traditional atomic analysis methods. This work offers a new method for detecting Cu2+ in environmental samples, and the plasmonic nanostructure provides new entry point for development of multiplexed sensing platform for in-field application. •The AgNPs-Cu2+-GNPs core-satellite nanostructure can not only be used as a naked-eye indicator of Cu2+ changed from brown to blue, but also as a highly selective SERS sensor for Cu2+.•The Cu2+-triggered NPs self-aggregation can be used as calibration scale for on-site fast screening of Cu2+ in real samples.•The colorimetric and SERS assay based on AgNPs-Cu2+-GNPs core-satellite structures can be used to determine Cu2+ in environmental samples.
ISSN:0956-5663
1873-4235
DOI:10.1016/j.bios.2020.112192