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Synthesis, characterization, and computational modeling of polyelectrolyte-coated plasmonic gold nanorods for photothermal heating studies
Author(s): Priscilla Lopez; Kathryn Mayer; Nicolas Large
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Paper 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.

Paper Details

Date Published: 9 September 2019
PDF: 5 pages
Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 110822W (9 September 2019); doi: 10.1117/12.2535687
Show Author Affiliations
Priscilla Lopez, The Univ. of Texas at San Antonio (United States)
Kathryn Mayer, The Univ. of Texas at San Antonio (United States)
Nicolas Large, The Univ. of Texas at San Antonio (United States)

Published in SPIE Proceedings Vol. 11082:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII
Din Ping Tsai; Takuo Tanaka, Editor(s)

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