title: Mechanistic insights into seeded growth processes of gold nanoparticles.
abstract: A facile approach for the synthesis of monodisperse gold nanoparticles with radii in the range of 7 to 20 nm is presented. Starting from monodisperse seeds with radii of 7 nm, produced in the first step, the addition of a defined amount of additional precursor material permits distinct size regulation and the realization of predicted nanoparticle sizes. These information were derived from ex- and in situ investigations by comprehensive small angle X-ray scattering (SAXS), X-ray absorption near edge structure (XANES) and UV-Vis data to obtain information on the physicochemical mechanisms. The obtained mechanisms can be transferred to other seeded growth processes. Compared to similar approaches, the presented synthesis route circumvents the use of different reducing or stabilizing agents. The size of resulting nanoparticles can be varied over a large size range presented for the first time without a measurable change in the shape, polydispersity or surface chemistry. Thus, the resulting nanoparticles are ideal candidates for size dependence investigations.
authors.affiliation: BAM Federal Institute for Materials Research and Testing, Richard Willstätter-Strasse 11, 12489, Berlin, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Polte
authors.forename: Martin
authors.initials: M
authors.lastname: Herder
authors.forename: Robert
authors.initials: R
authors.lastname: Erler
authors.forename: Simone
authors.initials: S
authors.lastname: Rolf
authors.forename: Anna
authors.initials: A
authors.lastname: Fischer
authors.forename: Christian
authors.initials: C
authors.lastname: Würth
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Thünemann
authors.forename: Ralph
authors.initials: R
authors.lastname: Kraehnert
authors.forename: Franziska
authors.initials: F
authors.lastname: Emmerling
mesh_terms: D055598:Chemical Phenomena; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053838:Scattering, Small Angle; D013056:Spectrophotometry, Ultraviolet; D056928:X-Ray Absorption Spectroscopy; D014961:X-Ray Diffraction
chemical_list: D006046:Gold