Journal
BIOSENSORS & BIOELECTRONICS
Volume 159, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2020.112192
Keywords
Colorimetry; Surface-enhanced Raman scattering (SERS); Copper ions; Nanoparticles; Detection
Categories
Funding
- National Natural Science Foundation of China [21507089, 21976123]
- Science and Technology Commission of Shanghai Municipality [19391901800]
- Shanghai University Young Teacher Training Program [ZZyy15095]
- Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development
- Open Project Fund for KEY LAB OF FIRE & EMG. RESCUE EQU., MEM [2019XFZB04]
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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 mu M-200 mu M for Cu2+, while SERS method displays good linear response from 1 pM to 100 mu M. The detection limit of Cu2+ is 0.032 mu M by colorimetry and 0.6 pM by SERS method, which is significantly lower than the acceptable limit of Cu2+ in drinking water (20 mu M) 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.
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