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Near-Infrared Surface-Enhanced Raman Scattering on Silver-Coated Porous Silicon Photonic Crystals

Škrabić, Marko; Kosović, Marin; Gotić, Marijan; Mikac, Lara; Ivanda, Mile; Gamulin, Ozren (2019) Near-Infrared Surface-Enhanced Raman Scattering on Silver-Coated Porous Silicon Photonic Crystals. Nanomaterials, 9 (3). ISSN 2079-4991

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Surface-enhanced Raman scattering (SERS) with near-infrared (NIR) excitation offers a safe way for the detection and study of fragile biomolecules. In this work, we present the possibility of using silver-coated porous silicon photonic crystals as SERS substrates for near-infrared (1064 nm) excitation. Due to the deep penetration of NIR light inside silicon, the fabrication of photonic crystals was necessary to quench the band gap photoluminescence of silicon crystal, which acts as mechanical support for the porous layer. Optimal parameters of the immersion plating process that gave maximum enhancement were found and the activity of SERS substrates was tested using rhodamine 6G and crystal violet dye molecules, yielding significant SERS enhancement for off-resonant conditions. To our knowledge, this is the first time that the 1064 nm NIR laser excitation is used for obtaining the SERS effect on porous silicon as a substrate.

Item Type: Article
Uncontrolled Keywords: SERS ; near-infrared ; crystal silicon photoluminescence ; porous silicon photonic crystals
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
Hibriridne silicijske nanstrukture za senzorik-NANOSENSMile IvandaIP-2014-09-7046HRZZ
Depositing User: Marijan Gotić
Date Deposited: 10 Jun 2019 13:59
DOI: 10.3390/nano9030421

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