Journal
NANOSCALE
Volume 7, Issue 43, Pages 18218-18224Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr06001j
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Funding
- National Key Basic Research Program of China [2013CB934304]
- China Post-doctoral Science Foundation [2014M561843]
- NSFC [11274312, 51202254, 51201159]
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Surface-enhanced Raman scattering (SERS) is considered to be an excellent candidate for analytical detection schemes, because of its molecular specificity, rapid response and high sensitivity. Here, SERSsubstrates of Ag-nanoparticle (Ag-NP) decorated Ge-nanotapers grafted on hexagonally ordered Simicropillar (denoted as Ag-NP@ Ge-nanotaper/ Si-micropillar) arrays are fabricated via a combinatorial process of two-step etching to achieve hexagonal Si-micropillar arrays, chemical vapor deposition of flocky Ge-nanotapers on each Si-micropillar and decoration of Ag-NPs onto the Ge-nanotapers through galvanic displacement. With high density three-dimensional (3D) hot spotscreated from the large quantities of the neighboring Ag-NPs and large-scale uniform morphology, the hierarchical Ag-NP@ Ge-nanotaper/ Si-micropillar arrays exhibit strong and reproducible SERS activity. Using our hierarchical 3D SERSsubstrates, both methyl parathion (a commonly used pesticide) and PCB-2 (one congener of highly toxic polychlorinated biphenyls) with concentrations down to 10(-7) M and 10(-5) M have been detected respectively, showing great potential in SERS-based rapid trace-level detection of toxic organic pollutants in the environment.
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