Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.4: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Deposition of silver nanoparticles on to thin films of ionic liquid on SiO2 — •E. Pachomow1, O. Höfft2, M. Marschewski1, W. Maus-Friedrichs1, and F. Endres2 — 1Intitut für Physik und Physikalischen Technologien, Technische Universität Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld — 2Institut für Mechanische Verfahrenstechnik, Technische Universität Clausthal, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld
Ionic liquids(IL) are a highly interesting group of solvents for electrochemical processes - mainly due to the combination of their high electrical conductivity, their electrochemical stability and their ability to dissolve a wide range of compounds[1]. Due to the low vapor pressure ionic liquids can be used in UHV. In this work the influences of ionic liquid films on the growth of silver nanoparticles on SiO2 were investigated. Here, monolayers of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide [EMIM]Tf2N on SiO2 were produced by vapor deposition. On these layers silver was evaporeted. The chemical composition and electronic strucrure of the silver-IL-SiO2 interface was characterized by metastable induced electron spectroscopy(MIES) and photoelectron spectroscopy(XPS, UPS(HeI)). The particles size distribution was determined with AFM. We compare these resultes with measurements on silver deposited on pure SiO2. We find that due to the ionic liquid films the particles size is increased. [1] F. Endres, S. Zein El Abedin, Phys. Chem. Chem. Phys., 8(2006)2101