Near-Infrared Surface-Enhanced Raman Scattering on Silver-Coated Porous Silicon Photonic Crystals
by
Marko Škrabić 1,2, Marin Kosović 3, Marijan Gotić 2,4, Lara Mikac 2,4, Mile Ivanda 2,4,*
and Ozren Gamulin 1,2,*
Marko Škrabić 1,2, Marin Kosović 3, Marijan Gotić 2,4, Lara Mikac 2,4, Mile Ivanda 2,4,* and Ozren Gamulin 1,2,*
1
Department of Physics and Biophysics, School of Medicine, University of Zagreb, Šalata 3b, 10000 Zagreb, Croatia
2
Research Unit New Functional Materials, Center of Excellence for Advanced Materials and Sensing Devices, Bijenička cesta 54, 10000 Zagreb, Croatia
3
Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia
4
Laboratory for Molecular Physics, Division of Materials Physics, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(3), 421; https://doi.org/10.3390/nano9030421
Received: 25 January 2019 / Revised: 26 February 2019 / Accepted: 6 March 2019 / Published: 12 March 2019
(This article belongs to the Special Issue Functional Nanoporous Materials)
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.
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Keywords:
SERS; near-infrared; crystal silicon photoluminescence; porous silicon photonic crystals; hot-spots
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MDPI and ACS Style
Škrabić, M.; Kosović, M.; Gotić, M.; Mikac, L.; Ivanda, M.; Gamulin, O. Near-Infrared Surface-Enhanced Raman Scattering on Silver-Coated Porous Silicon Photonic Crystals. Nanomaterials 2019, 9, 421.
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