Theory of Optical Coupling Effects Among Surfactant Au Nanoparticles Films
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Theory of Optical Coupling Effects Among Surfactant Au Nanoparticles Films ˜ on ´ Arboleda1 · Marcelo Lester2,3 · Mar´ıa C. Dalfovo1 · Diana C. Skigin4,5 · David Munet ˜ 1 Marina E. Inchaussandague4,5 · Francisco J. Ibanez Received: 25 October 2019 / Accepted: 27 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In previous reports, Dalfovo et al. showed experimentally that thin films of Au nanoparticles (NP) with organic coating change their optical properties when exposed to several analytes in the vapor phase (Anal Chem 84:4886–4892 2012; J Phys Chem C 119:5098–5106 2015). This optical behavior was associated with changes in the mean distance between nanoparticles, which resulted in a displacement of their plasmon bands towards blue or red in the presence of toluene (Tol) or ethanol (EtOH) vapors, respectively. In the report by Dalfovo et al. (J Phys Chem C 119:5098–5106 2015), insitu grazing-incidence small-angle X-ray spectroscopy (GISAXS) was performed to determine changes in the inter-NP distance within the film. In the present work, we perform theoretical calculations to interpret the results obtained by Dalfovo et al. (Anal Chem 84:4886–4892 2012; J Phys Chem C 119:5098–5106 2015). For this purpose, we employ two different theoretical approaches, a quasi-static method (QS) and the Korringa-Kohn-Rostoker method (KKR), in order to describe the plasmon resonance shift as a function of the inter-NP distance changes during exposure to Tol and EtOH vapors. Both theoretical approaches describe qualitatively the behavior observed in previous experimental results that correlate the plasmon resonant wavelength with the inter-NP distance obtained by GISAXS. Our theoretical results show that the plasmon resonant wavelength strongly depends on the ratio between the inter-particle distance and the diameter of the nanoparticles and consequently, these films could be used for optical tuning. Keywords Plasmon resonances · Optical tuning · Optical sensing
Introduction Small inter-nanoparticle distance changes may lead to significant changes in the optical properties of plasmonic Marcelo Lester
[email protected] 1
Instituto de Investigaciones Fisicoqu´ımicas, Te´oricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina
2
Instituto de F´ısica Arroyo Seco, IFAS (UNCPBA), Tandil, Argentina
3
´ CIFICEN (UNCPBA-CICPBA-CONICET), Grupo Optica de S´olidos - Elfo, Pinto 399, 7000 Tandil, Argentina
4
Facultad de Ciencias Exactas y Naturales, Departamento de F´ısica, Grupo de Electromagnetismo Aplicado, Buenos Aires, Argentina
5
CONICET - Instituto de F´ısica de Buenos Aires (IFIBA), Universidad de Buenos Aires, Buenos Aires, Argentina
nanoparticles [1]. Control over the distance between NPs impact directly on applications such as LSPR sensing [2, 3] SERS [4], optical filters [5], optoelectronics [6], and energy transfer between a dye and nanoparticles for solar cells [7], just to mention a few. Most
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