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Investigation of the Thermally Generated Au and Ag Nanoislands for SERS and LSPR Applications
Istvan Csarnovics * 1 , Miklo Veres 2 , Attila Bonyár 3 , Petra Pál 4
1  Department of Experimental Physics, Institute of Physics, Faculty of Science and Technology, University of Debrecen, H4032 Debrecen, Hungary
2  Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Konkoly-Thege Miklós st. 29-33, H1525 Budapest, Hungary
3  Department of Electronics Technology, Budapest University of Technology and Economics, H1111 Budapest, Hungary
4  Department of Experimental Physics, University of Debrecen, Bem sq 18/a, H4032 Debrecen, Hungary

10.3390/I3S2021Dresden-10153 (registering DOI)

Gold and silver nanoparticles are widely used as signal amplification elements in various electrochemical and optical sensor applications. Although these NPs can be synthesized in several ways, perhaps one of the simplest methods is the thermal annealing of pre-deposited thin films on glass. With this method, the parameters of the annealing process (time, temperature) and the pre-deposited thin film thickness influence and define the resulting size and distribution of the NPs on the surface. LSPR is a very sensitive optical phenomenon and can be utilized for a large variety of sensing purposes. SERS is an analytical method that can significantly increase the yield of Raman scattering of target molecules adsorbed on the surface of metallic nanoparticles. In this work, the performance of Au/Ag nanoislands was investigated for SERS and LSPR applications. The nanoislands were generated by thermally annealing thin layers of silver and gold, which were previously sputtered onto glass surfaces. The sensitivity of LSPR and SERS based devices are strongly depending on the used material and also on the size and geometry of the metallic nanoparticles. By controlling these parameters the plasmon absorption band can be tuned and the sensitivity can be optimized. This work was supported by the GINOP-2.3.2-15-2016-00041 project. ICs is grateful for the support of the János Bólyai Research Scholarship of the Hungarian Academy of Sciences.

Keywords: gold nanoparticles, silver nanoparticles, localized surface Plasmon resonance, surface enhanced Raman scattering, plasmonics, nanosensing devices