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Start date: 2020Subject: search.filters.subject.Plasmonics

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    Determination of nanoscale mechanical properties of polymers via plasmonic nanoantennas
    (2020-06-02) Boggiano, Hilario D.; Berté, Rodrigo; Cortés, Emiliano; Maier, Stefan A.; Bragas, Andrea V.; Scarpettini, Alberto Franco
    Nanotechnology and the consequent emergence of miniaturized devices are driving the need to improve our understanding of the mechanical properties of a myriad of materials. Here we focus on amorphous polymeric materials and introduce a new way to determine the nanoscale mechanical response of polymeric thin films in the GHz range, using ultrafast optical means. Coupling of the films to plasmonic nanoantennas excited at their vibrational eigenfrequencies allows the extraction of the values of the mechanical moduli as well as the estimation of the glass transition temperature via time-domain measurements, here demonstrated for PMMA films. This nanoscale method can be extended to the determination of mechanical and elastic properties of a wide range of spatially strongly confined materials.
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    Challenges on optical printing of colloidal nanoparticles.
    (2022-01-18) Violi, Ianina L.; Martínez, Luciana P.; Barella, Mariano; Zaza, Cecilia; Chvátal, Lukás; Zemánek, Pavel; Gutiérrez, Marina V.; Paredes, María Yanela; Scarpettini, Alberto Franco; Olmos-Trigo, Jorge; Pais, Valeria R.; Díaz Nóblega, Iván; Cortés, Emiliano; Sáenz, Juan José; Bragas, Andrea V.; Gargiulo, Julián; Stefani, Fernando D.
    While colloidal chemistry provides ways to obtain a great variety of nanoparticles with different shapes, sizes, material compositions, and surface functions, their controlled deposition and combination on arbitrary positions of substrates remain a considerable challenge. Over the last ten years, optical printing arose as a versatile method to achieve this purpose for different kinds of nanoparticles. In this article, we review the state of the art of optical printing of single nanoparticles and discuss its strengths, limitations, and future perspectives by focusing on four main challenges: printing accuracy, resolution, selectivity, and nanoparticle photostability.
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    Efficient method of arsenic removal from water based on photocatalytic oxidation by a plasmonic–magnetic nanosystem
    (2022-12-13) Paredes, María Yanela; Martínez, Luciana P.; Barja, Beatriz C.; Marchi, M. Claudia; Herran, Matías; Grinblat, Gustavo; Bragas, Andrea V.; Cortés, Emiliano; Scarpettini, Alberto F.
    Arsenic is one of the most toxic elements in natural waters since prolonged exposure to this metalloid can cause chronic damage to health. Its removal from ground-water remains one of the greatest environmental challenges to be addressed nowadays. Here, we present core-satellite hybrid nanostructures formed by plasmonic gold satellites supported onto magnetic iron oxides cores for sunlight-driven remediation of arsenic-containing water. Our experimental results show that the gold nanoparticles catalyze the oxidation of arsenic to much less toxic species and that - upon illumination - the generated heat and hot carriers further enhance the reaction rate. The iron oxides act as an arsenic adsorbent, enabling the complete removal of the catalysts and the adsorbed oxidized arsenic species through a magnet. We quantified the different catalytic contributions, showing that the plasmonic one is of the same order as the surface one. This work highlights the synergy between plasmonic catalysts and iron oxides for light-assisted water remediation.