title: Structural characterisation of alkyl amine-capped zinc sulphide nanoparticles.
abstract: Nanoparticles capped with amine ligands with different steric properties, dodecylamine and oleylamine, respectively, are investigated in the solid state as well as in solution. A combined X-ray diffraction, small angle X-ray scattering and electron microscopy investigation showed that the nanoparticles exhibit the sphalerite modification of ZnS as crystal phase with a diameter of 3-5 nm. A close packing of the monocrystalline nanoparticles in the solid state is observed. However, in the dodecylamine sample, besides spherical particles, a fraction of the nanoparticles is elongated. The nanoparticles are readily resoluble in apolar solvents like hexane. Dynamic light scattering (DLS) and SAXS investigations of the solutions reveal that the nanoparticles are dissolved as singular particles. In the case of oleylamine-capped ZnS, a defined core-shell structure with a ZnS core with a diameter of 4 nm and an organic shell with a thickness of approximately 2 nm have been found. Dodecylamine-capped nanoparticles slightly tend to form agglomerates with a diameter of approximately 40 nm.
authors.affiliation: Institute for Chemistry and Technology of Materials, Graz University of Technology, Graz, Austria. gabriele.kremser@yahoo.com
authors.forename: Gabriele
authors.initials: G
authors.lastname: Kremser
authors.forename: Thomas
authors.initials: T
authors.lastname: Rath
authors.forename: Birgit
authors.initials: B
authors.lastname: Kunert
authors.forename: Michael
authors.initials: M
authors.lastname: Edler
authors.forename: Gerhard
authors.initials: G
authors.lastname: Fritz-Popovski
authors.forename: Roland
authors.initials: R
authors.lastname: Resel
authors.forename: Ilse
authors.initials: I
authors.lastname: Letofsky-Papst
authors.forename: Werner
authors.initials: W
authors.lastname: Grogger
authors.forename: Gregor
authors.initials: G
authors.lastname: Trimmel