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Accueil du site > LPCNO > Séminaires > 2018 > Hierarchical plasmonic nanostructured materials : synthesis and applications
Hierarchical plasmonic nanostructured materials : synthesis and applications
Date : 22/03/2018 à 14:00
Titre : Hierarchical plasmonic nanostructured materials : synthesis and applications
Intervenant : Miguel Correa-Duarte
Provenance : Universidad de Vigo, Espagne
Salle : Salle de séminaire - LPCNO
Résumé : In the near future, hierarchically organized plasmonic nanostructured materials holding multiple functionalities, are expected to play a key role in many different fields, such as drug delivery, optics, catalysis, or sensing, among others. However, there is still an important lack of knowledge with regard to their fabrication which in the end, limits their applicability in the areas of interest. We report herein the implementation of novel strategies for the fabrication of such materials based on the confinement of plasmon-resonant nanoparticles. In a first example, the ability of plasmonic nanoparticles to concentrate light at the nanometer scale has been exploited for the simultaneous thermal activation and optical monitoring of high energy-demanding chemical reactions. As a proof of concept, a Diels-Alder cycloaddition reaction has been carried out into the inner cavities of plasmonic nanocapsules in order to evidence their efficacy as nanoreactors. Thus, it is demonstrated that this process can be performed in a confined volume with no alteration of the temperature of the bulk solvent, allowing at the same time a real time monitoring of the reaction progress. These plasmonic nanostructures have been also shown to be efficient nanoprobes for relevant signaling molecules. In this regard, an advanced hybrid SERS sensor has been implemented so as to perform the intracellular detection of NO. With this aim, a NO- chemoreceptor functionalization of plasmonic nanoparticles has been performed in order to engineer a quantitative fully biocompatible sensor capable of executing an in situ real time monitoring of the dynamics of NO in living cells. This sophisticated design prevents the interaction of cytosolic macromolecules with the active optical material and the enzymatic degradation of the sensing elements. Finally, anisotropic plasmonic nanoparticles with hot spots in Au-metal oxide hierarchical nanoarchitectures is discussed for enhancing hot electron-driven photocatalysis, as well as infrared shielding.
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