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 formany standard excitationwavelengths in the visible andNIR. 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.

Plasmonic nanowires for wide wavelength range molecular sensing / G. Marinaro, G. Das, A. Giugni, M. Allione, B. Torre, P. Candeloro, J. Kosel, E. Di Fabrizio. - In: MATERIALS. - ISSN 1996-1944. - 11:5(2018 May 17). [10.3390/ma11050827]

Plasmonic nanowires for wide wavelength range molecular sensing

A. Giugni
Co-primo
;
2018

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 formany standard excitationwavelengths in the visible andNIR. 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.
Nanowires; Plasmon resonance; Surface-enhanced Raman spectroscopy
Settore FIS/03 - Fisica della Materia
Settore ING-IND/23 - Chimica Fisica Applicata
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/825596
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