Nature Inspired Plasmonic Structures: Influence of Structural Characteristics on Sensing Capability
De Stefano, Mario
Di Fabrizio, Enzo M.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
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AbstractSurface enhanced Raman scattering (SERS) is a powerful analytical technique that allows the enhancement of a Raman signal in a molecule or molecular assemblies placed in the proximity of nanostructured metallic surfaces, due to plasmonic effects. However, laboratory methods to obtain of these prototypes are time-consuming, expensive and they do not always lead to the desired result. In this work, we analyse structures existing in nature that show, on a nanoscale, characteristic conformations of photonic crystals. We demonstrate that these structures, if covered with gold, change into plasmonic nanostructures and are able to sustain the SERS effect. We study three different structures with this property: opal, a hydrated amorphous form of silica (SiO·nHO); diatoms, a kind of unicellular alga; and peacock tail feather. Rhodamine 6G (down to 10 M) is used to evaluate their capability to increase the Raman signal. These results allow us to define an alternative way to obtain a high sensitivity in Raman spectroscopy, currently achieved by a long and expensive technique, and to fabricate inexpensive nanoplasmonic structures which could be integrated into optical sensors.
CitationPerozziello G, Candeloro P, Coluccio M, Das G, Rocca L, et al. (2018) Nature Inspired Plasmonic Structures: Influence of Structural Characteristics on Sensing Capability. Applied Sciences 8: 668. Available: http://dx.doi.org/10.3390/app8050668.
SponsorsThis work was supported by the project for Young researchers financed from the Italian Ministry of Health “High Throughput analysis of cancer cells for therapy evaluation by microfluidic platforms integrating plasmonic nanodevices” (CUP J65C13001350001, project No. GR-2010-2311677) granted to the nanotechnology laboratory of the Department of Experimental and Clinical Medicine of the University “Magna Graecia” of Catanzaro.
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