Journal
NANOTECHNOLOGY
Volume 25, Issue 14, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/14/145605
Keywords
Ag-NPs @ Au-NB arrays; surface-enhanced Raman scattering; mono-6-thio-beta-cyclodextrin; polychlorinated biphenyls
Funding
- National Key Basic Research Program of China [2013CB934304]
- National Natural Science Foundation of China [21107113, 11274312]
- Postdoctoral Science Foundation of China [2012M510164]
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Large-scale hexagonally close-packed arrays of Au-nanobowls (Au-NBs) with tens of Ag-nanoparticles (Ag-NPs) dispersed in each bowl (denoted as Ag-NPs@Au-NB arrays) are achieved and utilized as effective surface-enhanced Raman scattering (SERS) substrates. The field enhancement benefiting from the special particle-in-cavity geometrical structure as well as the high density of SERS hot spots located in the sub-10 nm gaps between adjacent Ag-NPs and at the particle-cavity junctions all together contribute to the high SERS activity of the Ag-NPs@Au-NB arrays; meanwhile the ordered morphological features of the Ag-NPs@Au-NB arrays guarantee uniformity and reproducibility of the SERS signals. By modifying the Ag-NPs@Au-NB arrays with mono-6-thio-beta-cyclodextrin, the SERS detection sensitivity to 3,3',4,4'-tetrachlorobiphenyl (PCB-77, one congener of polychlorinated biphenyls (PCBs, kinds of persistent organic pollutants which represent a global environmental hazard)) can be further improved and a low concentration down to 5 x 10(-7) M can still be examined, showing promising potential for application in rapid detection of trace-level PCBs in the environment.
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