We report new 3D hybrid plasmonic nanostructures exhibiting highly sensitive SERS-based sensing performance,
utilizing efficient plasmonic light absorption and analyte-enrichment effect. The hybrid plasmonic nanostructures
composed of 3D-stacked Ag NWs and NPs separated by a thin hydrophobic dielectric interlayer. A hydrophobic
polydimethylsiloxane (PDMS) interlayer provides dielectric nanogap between Ag NWs and NPs, and analyte-enrichment
effect due to the inhibition of drop spreading. The 3D hybrid PDMS-interlayered Ag nanostructures showed
hydrophobicity with initial contact angle of 137.6°. Utilizing the analyte-enrichment strategy, the PDMS-interlayered Ag
nanostructures exhibited an enhanced sensitivity of methylene blue molecules by a factor of 10 (limit of detection, LOD
of 1.5 nM), compared to the alumina-separated 3D hybrid Ag nanostructures.
Dong-Ho Kim, ChaeWon Mun, MinKyoung Lee, and Sung-Gyu Park, "3D-stacked Ag nanowires for efficient plasmonic light absorbers and SERS sensors," Proc. SPIE 9883, Metamaterials X, 988312 (Presented at SPIE Photonics Europe: April 06, 2016; Published: 18 April 2016); https://doi.org/10.1117/12.2230674.
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