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Sensors 2018, 18(11), 3821;

Surface Plasmon Resonances in Silver Nanostars

Departamento de Física, Universidad del Valle, AA 25360 Cali, Colombia
Department of Applied Physics, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain
School of Technology and Applied Sciences, São Paulo State University (UNESP), Campus Presidente Prudente, São Carlos 19060-900, Brazil
São Carlos Institute of Physics, University of São Paulo, PO Box 369, São Carlos 13560-970, Brazil
National Institute of Telecommunications (Inatel), Santa Rita do Sapucaí, MG 37540-000, Brazil
Author to whom correspondence should be addressed.
Received: 8 September 2018 / Revised: 25 October 2018 / Accepted: 31 October 2018 / Published: 8 November 2018
(This article belongs to the Section Chemical Sensors)
PDF [4850 KB, uploaded 8 November 2018]


The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths ( λ 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications. View Full-Text
Keywords: metallic nanoparticles; plasmonic biosensing; Ag nanostars metallic nanoparticles; plasmonic biosensing; Ag nanostars

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Reyes Gómez, F.; Rubira, R.J.G.; Camacho, S.A.; Martin, C.S.; Da Silva, R.R.; Constantino, C.J.L.; Alessio, P.; Oliveira, O.N., Jr.; Mejía-Salazar, J.R. Surface Plasmon Resonances in Silver Nanostars. Sensors 2018, 18, 3821.

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