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Serrano I.C.,Institute of Chemical Research of Catalonia | Vazquez-Vazquez C.,University of Vigo | Adams A.M.,Institute of Chemical Research of Catalonia | Stoica G.,Institute of Chemical Research of Catalonia | And 6 more authors.
RSC Advances | Year: 2013

The fabrication of highly luminescent, chemically stable and biocompatible small optical probes is of key interest in bioimaging. Herein we develop a multistep synthesis of hybrid superstructures that comprise quantum dot cores and dense layers of gold nanoparticles separated by a silica shell. This architecture allows for the versatile control of the QD-metal interactions by controlling the thickness of the dielectric spacer. The shell thickness is optimized at the nanometer scale in order to increase the enhanced photoluminescence. Further characterization of the emission in the single particle regime shows that our brighter particles require smaller acquisition times to yield better imaging results. © The Royal Society of Chemistry 2013. Source


Gomez-Grana S.,University of Vigo | Perez-Juste J.,University of Vigo | Alvarez-Puebla R.A.,Catalan Institution for Research and Advanced Studies | Alvarez-Puebla R.A.,Rovira i Virgili University | And 5 more authors.
Advanced Optical Materials | Year: 2013

A silver coating takes the lead in the SERS enhancement contest for nanorod supercrystals. On page 477, A. Guerrero-Martínez, L. M. Liz-Marzán, and co-workers determine that supercrystals based on standing core-shell gold-silver nanorods stabilized by gemini surfactants are the SERS champions, knocking out their gold nanorod supercrystal counterparts. After a tough competition, silver substrates show a perfect combination of high optical activity and large homogeneous sensing area that will be difficult to defeat. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Gomez-Grana S.,University of Vigo | Perez-Juste J.,University of Vigo | Alvarez-Puebla R.A.,Catalan Institution for Research and Advanced Studies | Alvarez-Puebla R.A.,Rovira i Virgili University | And 5 more authors.
Advanced Optical Materials | Year: 2013

The fabrication of supercrystals of standing core-shell gold-silver nanorods stabilized by gemini surfactants provides SERS substrates with high optical activity, large homogenous sensing areas, and the potential to maximize the SERS signal with respect to their gold nanorod supercrystal counterparts. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Leon T.,Center for Chemical Technology of Catalonia | Fernandez E.,Rovira i Virgili University
Chemical Communications | Year: 2016

The first intermolecular Pauson-Khand reaction, conducted using internal alkynylboronic esters, allows the installation of the boronic ester moiety at the β-position of the cyclopentenone with total regio- and stereoselectivity. © 2016 The Royal Society of Chemistry. Source


Li W.,Catalonia Institute for Energy Research IREC | Zamani R.,Catalonia Institute for Energy Research IREC | Zamani R.,CSIC - Institute of Materials Science | Rivera Gil P.,University of Marburg | And 12 more authors.
Journal of the American Chemical Society | Year: 2013

We report a procedure to prepare highly monodisperse copper telluride nanocubes, nanoplates, and nanorods. The procedure is based on the reaction of a copper salt with trioctylphosphine telluride in the presence of lithium bis(trimethylsilyl)amide and oleylamine. CuTe nanocrystals display a strong near-infrared optical absorption associated with localized surface plasmon resonances. We exploit this plasmon resonance for the design of surface-enhanced Raman scattering sensors for unconventional optical probes. Furthermore, we also report here our preliminary analysis of the use of CuTe nanocrystals as cytotoxic and photothermal agents. © 2013 American Chemical Society. Source

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