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Nanomaterials 2019, 9(4), 619; https://doi.org/10.3390/nano9040619

Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform

Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon 51508, Korea
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Received: 17 March 2019 / Revised: 11 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue Surface-Enhanced Raman Spectroscopy in the Nano-World)
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Abstract

This paper reports a highly sensitive and selective surface-enhanced Raman spectroscopy (SERS) sensing platform. We used a simple fabrication method to generate plasmonic hotspots through a direct maskless plasma etching of a polymer surface and the surface tension-driven assembly of high aspect ratio Ag/polymer nanopillars. These collapsed plasmonic nanopillars produced an enhanced near-field interaction via coupled localized surface plasmon resonance. The high density of the small nanogaps yielded a high plasmonic detection performance, with an average SERS enhancement factor of 1.5 × 107. More importantly, we demonstrated that the encapsulation of plasmonic nanostructures within nanofiltration membranes allowed the selective filtration of small molecules based on the degree of membrane swelling in organic solvents and molecular size. Nanofiltration membrane-encapsulated SERS substrates do not require pretreatments. Therefore, they provide a simple and fast detection of toxic molecules using portable Raman spectroscopy. View Full-Text
Keywords: hotspots; localized surface plasmon resonance; molecular filtration; surface-enhanced Raman spectroscopy; sensors hotspots; localized surface plasmon resonance; molecular filtration; surface-enhanced Raman spectroscopy; sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mun, C.; Linh, V.T.N.; Kwon, J.-D.; Jung, H.S.; Kim, D.-H.; Park, S.-G. Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform. Nanomaterials 2019, 9, 619.

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