Femtosecond laser-controlled reshaping of gold nanorods into colloids with ultra-narrow localizaed surface Plasmon resonances

González, Guillermo; Díaz-Núñez, Pablo; Rivera, Antonio; Prada, Alejandro; Tardajos, Gloria; González-Izquierdo, Jesús; Bañares, Luis; Llombart, Pablo; MacDowell, Luis G.; Alcolea-Palafox, Mauricio; Liz-Marzán, Luis M.; Peña-Rodríguez, Ovidio; Guerrero-Martínez, Andrés


The irradiation of gold nanorod colloids with a femtosecond laser can be tuned to induce controlled nanorod reshaping, yielding colloids with exceptionally narrow localized surface plasmon resonance bands. The process relies on a regime characterized by a gentle multishot reduction of the aspect ratio, whereas the rod shape and volume are barely affected. Successful reshaping can only occur within a narrow window of the heat dissipation rate: Low cooling rates lead to drastic morphological changes, and fast cooling has nearly no effect. Hence, a delicate balance must be achieved between irradiation fluence and surface density of the surfactant on the nanorods. This perfection process is appealing because it provides a simple, fast, reproducible, and scalable route toward gold nanorods with an optical response of exceptional quality, near the theoretical limit.

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Título de la Revista: SCIENCE
Volumen: 358
Número: 6363
Editorial: American Association for the Advancement of Science
Fecha de publicación: 2017
Página de inicio: 640
Página final: 644
Idioma: Inglés
URL: https://science.sciencemag.org/content/358/6363/640.abstract
Notas: WOS Core Sellection ISI