Plasmon – Inorganic Nanoparticles Group http://www.inorganicnanoparticles.net Research group at ICN Mon, 13 Jan 2020 13:55:52 +0000 en-US hourly 1 https://wordpress.org/?v=4.7.28 Robust one-pot synthesis of citrate-stabilized Au@CeO2 hybrid nanocrystals with different thickness and dimensionality http://www.inorganicnanoparticles.net/auceo2/ Wed, 15 May 2019 09:25:46 +0000 http://www.inorganicnanoparticles.net/?p=2180 Well-defined colloidal Au@CeO2 hybrid nanocrystals (NCs) comprising different core/shell morphologies have been synthesized via a novel and simple one-pot aqueous approach. The method allows producing hybrid morphologies composed by an active and accessible Au core coated by a porous CeO2 shell with varying shell thickness and dimensionality by simply adjusting the Au3+/Ce3+ precursor ratio. These hybrid NCs are highly monodisperse and well-dispersed in water, showing intense surface plasmon resonance bands that offer unique opportunities for advanced material applications, such as plasmonics and catalysis.

Robust one-pot synthesis of citrate-stabilized Au@CeO2 hybrid nanocrystals with different thickness and dimensionality

Applied Materials Today

Volume 15, June 2019, Pages 445-452

]]> New Paper on the Study of the Localized Multipolar Surface Plasmon Resonances of Silver Nanoparticles Published in Langmuir. http://www.inorganicnanoparticles.net/new-paper-on-the-study-of-the-localized-multipolar-surface-plasmon-resonances-of-silver-nanoparticles-published-in-langmuir/ Fri, 10 Mar 2017 19:33:43 +0000 http://www.inorganicnanoparticles.net/?p=1977 Silver nanoparticles absorb and scatter light with extraordinary efficiency due to the collective oscillations of the conduction electrons of the metal surface when they are excited by light of an specific wavelengths. These oscillations, known as a localized surface plasmon resonances (LSPRs) are determined by the size, shape and local environment in which the nanoparticle is embedded. In this work, we have spectroscopically investigated the effect of the size and surface coating on the sensitivity of localized multipolar surface plasmon resonances in high-quality silver colloidal solutions with precisely controlled sizes from 10 to 220 nm and well-defined surface chemistry, identifying the size-dependence of dipolar, quadrupolar and octapolar modes. Besides, we studied how these multipolar resonances are affected by modifications of the NP’ surface coating, in particular the dependences on the length and the anchor group of the molecule attached at its surface, revealing the higher sensitivity of larger sizes, dipolar than higher-order modes, thiol than amine groups, and long than short molecules. We also extend this study to gold nanoparticles, aiming to compare the sensitivity of both materials, quantifying the higher sensitivity of silver. The work has now been published in Langmuir under the title “Quantifying the Sensitivity of Multipolar (Dipolar, Quadrupolar and Octapolar) Surface Plasmon Resonances in Silver Nanoparticles: The Effect of Size, Composition and Surface Coating.”

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