Nanoplasmonics and surface enhanced spectroscopy

Tunable SERS substrates for wide optical range based on bimetallic nanoparticles
Hreshchuk O.M.1, Dzhagan V.M.1, Stetsenko M.O.1, Mukha Iu.P.2, Vityuk N.V.2 
1 V. Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine, 41, Prospect Nauky, Kyiv-03128, Ukraine.
E-mail: Hreshchuk@gmail.com
2 Chuiko Institute of Surface Chemistry, NAS of Ukraine, 17, General Naumov Str., Kyiv, Ukraine.

Surface-enhanced Raman spectroscopy (SERS) is highly effective method for detection of trace amounts of organic/inorganic substances. It finds a lot of applications in chemistry, medicine, pharmacology, ecology etc. [1]. It is well known, that for efficient application of SERS method it is necessary to develop substrates with plasmonic resonances in the required spectral range. 

In this work we have developed substrates that can cover wide optical range (400 – 550 nm). A facile method of synthesis allows fine tuning of the maximum of plasmon resonance to a desired optical region. In this range it could perfectly fit, for instance, emission wavelengths of most common solid-state and gas lasers used for measuring SERS: 454.6, 457.9, 476.5, 488, 496.5, 501.7, 514.5, 528.7, 532 and 568.2 nm.
The developed SERS substrates were characterized by SEM, UV-VIS and Raman spectroscopy. It is shown that they effectively enhance Raman signal of organic molecules.

1.	Hamon C., Liz-Marzán L.M., Colloidal Design of Plasmonic Sensors Based of Surface Enhanced Raman Scattering // J. Coll. Interf. Sci.-2018,- 512.- P. 834-843.