Journal
NANO RESEARCH
Volume 8, Issue 7, Pages 2261-2270Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0737-7
Keywords
Ag-hemisphere; urchin-like; surface roughness; polychlorinated biphenyls (PCBs); surface-enhanced Raman scattering (SERS)
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Funding
- National Basic Research Program of China [2013CB934304]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- National Natural Science Foundation of China [21303211, 11274312, 51472245]
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The surface topography of noble metal particles is a significant factor in tailoring surface-enhanced Raman scattering (SERS) properties. Here, we present a simple fabrication route to hexagonally arranged arrays of surface-roughened urchin-like Ag hemispheres (Ag-HSs) decorated with Ag nanoparticles (Ag-NPs) for highly active and reproducible SERS substrates. The urchin-like Ag-HS arrays are achieved by sputtering Ag onto the top surface of a highly ordered porous anodic aluminum oxide (AAO) template to form ordered arrays of smooth Ag-HSs and then by electrodepositing Ag-NPs onto the surface of each Ag-HS. Owing to the ordered arrangement of the Ag-HSs and the improved surface roughness, the urchin-like hierarchical Ag-HS arrays can provide sufficient and uniform hot spots for reproducible and highly active SERS effects. Using the urchin-like Ag-HS arrays as SERS substrates, 10(-7) M dibutyl phthalate (a member of plasticizers family) and 1.5 x 10(-5) M PCB-77 (one congener of polychlorinated biphenyl, a notorious class of pollutants) are identified, showing promising potential for these substrates in the rapid recognition of organic pollutants.
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