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Article

Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement

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Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, 550 Sierra Leona Ave, San Luis Potosí 78210, Mexico
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Doctorado Institucional en Ingeniería y Ciencia de Materiales (DICIM-UASLP), Universidad Autónoma de San Luis Potosí, 550 Sierra Leona Ave, San Luis Potosí 78210, Mexico
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Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, C/ Tulipán s/n, Móstoles, 28933 Madrid, Spain
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Applied Optics Complutense Group, Faculty of Optics and Optometry, University Complutense of Madrid, 118 Arcos de Jalón Ave, 28037 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Michał Kotkowiak and Lukasz Piatkowski
Nanomaterials 2021, 11(7), 1696; https://doi.org/10.3390/nano11071696
Received: 12 May 2021 / Revised: 21 June 2021 / Accepted: 22 June 2021 / Published: 28 June 2021
(This article belongs to the Special Issue Nanoscience for Photonics and Spectroscopy)
A nanoparticle’s shape and size determine its optical properties. Nanorods are nanoparticles that have double absorption bands associated to surface plasmon oscillations along their two main axes. In this work, we analize the optical response of gold nanorods with numerical simulations and spectral absorption measurements to evaluate their local field enhancement—which is key for surface-enhanced Raman spectroscopic (SERS) applications. Our experimental results are in good agreement with finite element method (FEM) simulations for the spectral optical absorption of the nanoparticles. We also observed a strong dependence of the optical properties of gold nanorods on their geometrical dimension and shape. Our numerical simulations helped us reveal the importance of the nanorods’ morphology generated during the synthesis stage in the evaluation of absorption and local field enhancement. The application of these gold nanorods in surface-enhancement Raman spectroscopy is analyzed numerically, and results in a 5.8×104 amplification factor when comparing the values obtained for the nanorod deposited on a dielectric substrate compared to the nanorod immersed in water. View Full-Text
Keywords: computational electromagnetism; gold nanorods; Raman spectroscopy computational electromagnetism; gold nanorods; Raman spectroscopy
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MDPI and ACS Style

Núñez-Leyva, J.M.; Kolosovas-Machuca, E.S.; Sánchez, J.; Guevara, E.; Cuadrado, A.; Alda, J.; González, F.J. Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement. Nanomaterials 2021, 11, 1696. https://doi.org/10.3390/nano11071696

AMA Style

Núñez-Leyva JM, Kolosovas-Machuca ES, Sánchez J, Guevara E, Cuadrado A, Alda J, González FJ. Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement. Nanomaterials. 2021; 11(7):1696. https://doi.org/10.3390/nano11071696

Chicago/Turabian Style

Núñez-Leyva, Juan M., Eleazar S. Kolosovas-Machuca, John Sánchez, Edgar Guevara, Alexander Cuadrado, Javier Alda, and Francisco J. González. 2021. "Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement" Nanomaterials 11, no. 7: 1696. https://doi.org/10.3390/nano11071696

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