title: A General Method for Solvent Exchange of Plasmonic Nanoparticles and Self-Assembly into SERS-Active Monolayers.
abstract: We present a general route for the transfer of Au and Ag nanoparticles of different shapes and sizes, from water into various organic solvents. The experimental conditions for each type of nanoparticles were optimized by using a combination of thiolated poly(ethylene glycol) and a hydrophobic capping agent, such as dodecanethiol. The functionalized nanoparticles were readily transferred into organic dispersions with long-term stability (months). Such organic dispersions efficiently spread out on water, leading to self-assembly at the air/liquid interface into extended nanoparticle arrays which could in turn be transferred onto solid substrates. The dense close packing in the obtained nanoparticle monolayers results in extensive plasmon coupling, rendering them efficient substrates for surface-enhanced Raman scattering spectroscopy.
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Ana B
authors.initials: AB
authors.lastname: Serrano-Montes
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Dorleta
authors.initials: D
authors.lastname: Jimenez de Aberasturi
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Judith
authors.initials: J
authors.lastname: Langer
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Giner-Casares
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Scarabelli
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.
authors.forename: Ada
authors.initials: A
authors.lastname: Herrero
authors.affiliation: CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain.|Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
authors.forename: Luis M
authors.initials: LM
authors.lastname: Liz-Marzán
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver; D011092:Polyethylene Glycols; D006046:Gold; C000595209:polyethylene glycol 1000