Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 11: Colloids and Nanoparticles I

CPP 11.4: Vortrag

Montag, 8. März 2004, 14:45–15:00, H 39

Electrical and optical properties of metal/PTFE nanocomposite films prepared by RF magnetron sputtering — •Ulrich Schürmann, Haile Takele, Susanne Kreitz, Vladimir Zaporojtchenko, and Franz Faupel — Lehrstuhl für Materialverbunde, Technische Fakultät der CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany

We present a study of physical-chemical properties of thin PTFE films with embedded noble metals (Ag, Au, Cu). These Films were deposited by RF magnetron sputtering from a composite (PTFE/metal) target. The deposition rate was monitored by a quarz crystal microbalance, which was 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 different substrates. Based on TEM images, the influence of the RF parameters and Ar pressure on the particle morphology was analyzed. A metal volume fraction was monitored by SEM/EDX using a metal/polymer standard, which was calibrate gravimetrically. We characterized the chemical composition and the structure of the composites by using XPS and FTIR. Variation of the resistivity and the dielectric constant as a function of metal volume fraction were carried out on a impedance measurement device. The variation of electrical properties of Ag/PTFE nanocomposites close to the percolation threshold and the difference in the UV/Vis-spectra depending on metal concentration, particle size and density were observed.