Nanoplasmonic and Microfluidic Devices for Biological Sensing

Perozziello, Gerardo; Giugni, Andrea; Allione, Marco; Torre, Bruno; Das, Gobind; Coluccio, Maria Laura; Marini, Monica; Tirinato, Luca; Moretti, Manola; Limongi, Tania; Candeloro, Patrizio; Fabrizio, Enzo M. Di

doi:10.1007/978-94-024-0850-8_12

Cited by 2 publications

(1 citation statement)

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“…The molecules, which need to be analysed, 2 of 11 are deposited on these substrates and are excited by an electromagnetic (EM) field, which is enhanced by the proximal metal nanostructures. The amplified EM field interacts with molecules and produces Raman scattering which is again amplified by the metal nanostructures [9][10][11]. In greater detail, the incident EM waves excite plasmon resonances within the metal nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Nature Inspired Plasmonic Structures: Influence of Structural Characteristics on Sensing Capability

et al. 2018

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Surface 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 2 •nH 2 O); diatoms, a kind of unicellular alga; and peacock tail feather. Rhodamine 6G (down to 10 −12 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.

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Section: Introductionmentioning

confidence: 99%