Synthesis, characterization, and computational modeling of polyelectrolyte-coated plasmonic gold nanorods for photothermal heating studies

Priscilla Lopez; Kathryn Mayer; Nicolas Large

doi:10.1117/12.2535687

9 September 2019 Synthesis, characterization, and computational modeling of polyelectrolyte-coated plasmonic gold nanorods for photothermal heating studies

Priscilla Lopez, Kathryn Mayer, Nicolas Large

Author Affiliations +

Proceedings Volume 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII; 110822W (2019) https://doi.org/10.1117/12.2535687
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

In recent decades the advancement in the field of plasmonics has been crucial for the development of applications such as chemical detection, photothermal cancer therapy, and memory elements. In this work we present theoretical and experimental results focusing on the characterization of gold nanorods (AuNRs) coated with polyelectrolytes.These AuNRs constitute ideal nanoparticle-biomolecular hybrid system for study of photothermal heating effects. To start we synthesized AuNRs using a seed-mediated growth procedure. This synthesis employs a surfactant system using hexadecyltrimethylammonium bromide (CTAB) for stability with the addition of silver ions for improved formation. Once synthesized the nanorods were coated with polyelectrolytes sodium poly (acrylic acid) (PAA), poly (allylamine hydrochloride) (PAH), and poly (sodium-4-styrenesulfonate) (PSS) by a layer-by-layer absorption technique. Making use of the positive surface charge of CTAB-coated AuNRs, in this technique electrostatic absorption of an anionic polyelectrolyte and a cationic polyelectrolyte through charge reversal is enabled. The coated nanorods are characterized by UV-vis spectroscopy and electron microscopy to control the effectiveness of each polyelectrolyte on coating the nanorods. In addition to characterizing these AuNRs experimentally we also calculate their optical properties (far-field and near-field) via electrodynamics simulations, using the finite-difference time-domain method.

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Priscilla Lopez, Kathryn Mayer, and Nicolas Large "Synthesis, characterization, and computational modeling of polyelectrolyte-coated plasmonic gold nanorods for photothermal heating studies", Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 110822W (9 September 2019); https://doi.org/10.1117/12.2535687

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KEYWORDS

Nanorods

Gold

Plasmonics

Computational modeling

Absorption

Optical properties

Cancer

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