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Materials 2018, 11(5), 827; https://doi.org/10.3390/ma11050827

Plasmonic Nanowires for Wide Wavelength Range Molecular Sensing

1
Division of Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
2
Structural Molecular Imaging Light Enhanced Spectroscopies Laboratory, Physical Science and Engineering, Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3
Bio Nano Mechanical Laboratory, Department of Experimental and Clinical Medicine, University Magna Graecia, 88100 Catanzaro, Italy
*
Author to whom correspondence should be addressed.
Received: 28 March 2018 / Revised: 6 May 2018 / Accepted: 14 May 2018 / Published: 17 May 2018
(This article belongs to the Special Issue SERS-Active Substrates)
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Abstract

In this paper, we propose the use of a standing nanowires array, constituted by plasmonic active gold wires grown on iron disks, and partially immersed in a supporting alumina matrix, for surface-enhanced Raman spectroscopy applications. The galvanic process was used to fabricate nanowires in pores of anodized alumina template, making this device cost-effective. This fabrication method allows for the selection of size, diameter, and spatial arrangement of nanowires. The proposed device, thanks to a detailed design analysis, demonstrates a broadband plasmonic enhancement effect useful for many standard excitation wavelengths in the visible and NIR. The trigonal pores arrangement gives an efficiency weakly dependent on polarization. The devices, tested with 633 and 830 nm laser lines, show a significant Raman enhancement factor, up to around 6 × 104, with respect to the flat gold surface, used as a reference for the measurements of the investigated molecules. View Full-Text
Keywords: surface-enhanced Raman spectroscopy; nanowires; plasmon resonance surface-enhanced Raman spectroscopy; nanowires; plasmon resonance
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Marinaro, G.; Das, G.; Giugni, A.; Allione, M.; Torre, B.; Candeloro, P.; Kosel, J.; Di Fabrizio, E. Plasmonic Nanowires for Wide Wavelength Range Molecular Sensing. Materials 2018, 11, 827.

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