Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 6: Nanostrukturen I
O 6.8: Vortrag
Montag, 24. März 2003, 13:00–13:15, M\"UL/ELCH
Preparation, Characterisation and Properties of Self-Assembled Gold Nanoparticle/Alkanedithiol Films — •Yvonne Joseph1, Isabelle Besnard1, Miriam Rosenberger1, Berit Guse1, Heinz-Georg Nothofer1, Jurina M. Wessels1, Ute Wild2, Axel Knop-Gericke2, Dangsheng Su2, Robert Schloegl2, Akio Yasuda1, and Tobias Vossmeyer1 — 1Sony International (Europe) GmbH, Materials Science Laboratories, Hedelfinger Str. 61, 70327 Stuttgart — 2Fritz Haber Institute of the MPG, Department of Inorganic Chemistry, Faradayweg 4-6, 14195 Berlin
Au-nanoparticle(NP)/alkanedithiol interlinked films were prepared via layer-by-layer self-assembly using dodecaneamine-stabilized Au-NP with an average size of 4 nm and alkanedithiols with different chain lengths (C6, C9, C12, C16). AFM, FE-SEM and TEM revealed thin (26 - 34 nm) nanoporous films. The composition of the films was analyzed by XPS. The absence of a N1s signal indicated that all dodecaneamine ligands were exchanged by the dithiol linker during preparation. Two sulfur signals were observed and assigned to sulfur bound to gold and to free thiol groups. All films showed linear current-voltage characteristics. Conductivity measurements at variable temperature were consistent with an Arrhenius-type activation of charge transport. When dosing the films with hydrophobic vapors the resistance of the films increased significantly. This response increased exponentially with increasing length of the dithiol molecules. The chemical selectivity of the films corresponded essentially to the solubility properties of the alkanedithiol molecules.