60900 20190529115211.0 doi 10.1021/jp5096129 sideral 89028 ART-2014-89028 eng (orcid)0000-0002-2576-6382 Prieto, M. Morphological tunability of the plasmonic response: From hollow gold nanoparticles to gold nanorings 2014 Access copy available to the general public Unrestricted The optical and morphological properties of hollow gold nanoparticles (HGNPs) can be finely modified by employing poly-l-lysine hydrobromide (PLL), a homopoly amino acid of the l-lysine, used as reducer and stabilizer. We demonstrate that the reshaping of these plasmonic hollow nanostructures responds to an Ostwald ripening process in which the initial HGNPs dissolve under the acidic conditions provided by the PLL generating chloroaurate ions. These ions are then reduced by the primary amines of the PLL itself to produce metallic gold, which is then redeposited on the surface of the HGNPs, rendering the final shape: either nanorings or even spheres depending on the contact time. We investigate locally the plasmonic response of these nanostructures by electron energy loss spectroscopy (EELS). The plasmon excitations are interpreted by discrete dipole approximation (DDA) simulations. We demonstrate that, thanks to this controlled top-down morphological modification, a fine-tuning of the optical response is possible. Unlike the traditional lithographic techniques, this has been achieved in a controlled manner using wet chemistry, enabling the potential use of these nanostructures for a broad range of plasmonic applications, including biomedicine, catalysis, and quantum communications. info:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-3-P info:eu-repo/grantAgreement/EC/FP7/614715/EU/A Photo-triggered On-demand Drug Delivery System for Chronic Pain/NANOHEDONISM info:eu-repo/grantAgreement/EC/FP7/321642/EU/Development of a microfluidic platform to produce nanomaterials and assessment on new nanotechnology applications/PLATFORM2NANO info:eu-repo/grantAgreement/EC/FP7/312483/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM 2 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.772 2014 CHEMISTRY, PHYSICAL 29 / 139 = 0.209 2014 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 32 / 260 = 0.123 2014 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 21 / 80 = 0.262 2014 Q2 T1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-2071-9093 Arenal, R. Henrard, L. (orcid)0000-0001-6971-5192 Gomez, L. Universidad de Zaragoza (orcid)0000-0002-6873-5244 Sebastian, V. Universidad de Zaragoza (orcid)0000-0003-3165-0156 Arruebo, M. Universidad de Zaragoza 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 118, 49 (2014), 28804-28811 J. phys. chem., C Journal of Physical Chemistry C 1932-7447 1282640 http://zaguan.unizar.es/record/60900/files/texto_completo.pdf Postprint 40403 http://zaguan.unizar.es/record/60900/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:60900 articulos driver 2019-05-29-11:39:35 ARTICLE