@Article{C5NR08054A,
author ="Casado-Rodriguez, M. A. and Sanchez-Molina, M. and Lucena-Serrano, A. and Lucena-Serrano, C. and Rodriguez-Gonzalez, B. and Algarra, M. and Diaz, A. and Valpuesta, M. and Lopez-Romero, J. M. and Perez-Juste, J. and Contreras-Caceres, R.",
title  ="Synthesis of vinyl-terminated Au nanoprisms and nanooctahedra mediated by 3-butenoic acid: direct Au@pNIPAM fabrication with improved SERS capabilities",
journal  ="Nanoscale",
year  ="2016",
volume  ="8",
issue  ="8",
pages  ="4557-4564",
publisher  ="The Royal Society of Chemistry",
doi  ="10.1039/C5NR08054A",
url  ="http://dx.doi.org/10.1039/C5NR08054A",
abstract  ="Here we describe the first seedless synthesis of vinyl-terminated Au nanotriangular prisms (AuNTPs) and nanooctahedra (AuNOC) in aqueous media. This synthesis is performed by chemical reduction of chloroauric acid (HAuCl4) with 3-butenoic acid (3BA) in the presence of benzyldimethylammonium chloride (BDAC). The principal novelties of the presented method are the use of a mixture of 3BA and BDAC{,} the synthesis of gold prisms and octahedra with controllable size{,} and the presence of terminal double bonds on the metal surface. Initially this method produces a mixture of triangular gold nanoprisms and octahedra; however{,} both morphologies are successfully separated by surfactant micelle induced depletion interaction{,} reaching percentages up to ∼90%. Moreover{,} the alkene moieties present on the gold surface are exploited for the fabrication of hybrid core@shell particles. Gold octahedra and triangular prisms are easily encapsulated by free radical polymerization of N-isopropylacrylamide (NIPAM). Finally{,} in order to obtain a gold core with the most number of tips{,} AuNTP@pNIPAM microgels were subjected to gold core overgrowth{,} thus resulting in star-shaped nanoparticles (AuSTs@pNIPAM). We use 4-amino-benzenethiol as the model analyte for SERS investigations. As expected{,} gold cores with tips and high curvature sites produced the highest plasmonic responses."}