Journal
NANOTECHNOLOGY
Volume 20, Issue 22, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/22/225303
Keywords
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Funding
- NSF [CBET-0651780, CBET-0744879]
- ACS Petroleum Research Fund
- University of Florida
- UF Research Opportunity Incentive Seed Fund
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This paper reports on a scalable bottom-up technology for producing periodic gold nanotips with tunable sharpness as surface-enhanced Raman scattering (SERS) substrates. Inverted silicon pyramidal pits, which are templated from non-close-packed colloidal crystals prepared by a spin-coating technology, are used as structural templates to replicate arrays of polymer nanopyramids with nanoscale sharp tips. The deposition of a thin layer of gold on the polymer nanopyramids leads to the formation of SERS-active substrates with a high enhancement factor (up to 10(8)). The thickness of the deposited metal determines the sharpness of the nanotips and the resulting Raman enhancement factor. Finite-element electromagnetic modeling shows that the nanotips can significantly enhance the local electromagnetic field and the sharpness of nanotips greatly affects the SERS enhancement.
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