title: Versatile phase transfer of gold nanoparticles from aqueous media to different organic media.
abstract: A novel, simple, and very efficient method to prepare hydrophobically modified gold particles is presented. Gold nanoparticles of different sizes and polydispersities were prepared. The diameter of the gold particles ranges from 5 to 37 nm. All systems were prepared in aqueous solution stabilized by citrate and afterwards transferred into an organic phase by using amphiphilic alkylamine ligands with different alkyl chain lengths. The chain length was varied between 8 and 18 alkyl groups. Depending on the particle size and the alkylamine, different transfer efficiencies were obtained. In some cases, the phase transfer has a yield of about 100%. After drying, the particles can be redispersed in different organic solvents. Characterization of the particles before and after transfer was performed by using UV/Vis spectroscopy, transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS) techniques. The effect of organic solvents with various refractive indices on the plasmon band position was investigated.
authors: School of Chemistry & Bio21 Institute, University of Melbourne, Melbourne, 3010, Australia.
authors: Matthias
authors: M
authors: Karg
authors: Natascha
authors: N
authors: Schelero
authors: Claudia
authors: C
authors: Oppel
authors: Michael
authors: M
authors: Gradzielski
authors: Thomas
authors: T
authors: Hellweg
authors: Regine
authors: R
authors: von Klitzing
mesh_terms: D006046:Gold / Q000737:chemistry*; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D012997:Solvents; D014867:Water; D006046:Gold