Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 2: Elektrische und optische Schichteigenschaften

DS 2.5: Vortrag

Freitag, 4. März 2005, 11:45–12:00, TU HS107

Controlled syntheses of silver/polymer nanocomposite films by co-sputtering from two magnetron sources — •Ulrich Schürmann, Whitney Hartung, Haile Takele, Vladimir Zaporojtchenko, and Franz Faupel — Lehrstuhl für Materialverbunde, Technische Fakultät der CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany

We present a study of the physico-chemical properties of thin polymer films with embedded silver nanoparticles. These films were deposited by co-sputtering from two magnetron sources. The deposition rates were monitored by quartz crystal microbalances, which were calibrated by measuring film thickness after deposition with a profilometer. To study optical and electrical properties, nanocomposites with thickness of some hundred nanometers were deposited on different substrates. The metal volume fraction was monitored by SEM/EDX using a metal/polymer standard, which was calibrated gravimetrically. We characterized the chemical composition and the structure of the composites by using TEM, XRD, XPS and FTIR. Electrical properties of the composite material were studied at different metal filling factors and temperatures. We observe a sharp change in the resistivity over 10 orders of magnitude near the percolation threshold. Marked difference in the UV/Vis-spectra depending on metal concentration, particle size and density were observed. The optical absorption shows a red shift of the absorption peak from 405 nm to more than 500 nm at higher silver content.