Dresden 2006 – scientific programme

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DS: Dünne Schichten

DS 1: Optical properties of thin films I

DS 1.5: Talk

Monday, March 27, 2006, 10:30–10:45, GER 37

Vapor induced changes in optical and electrical properties of quasi 2-dimensional metal/polymer nanocomposites near the percolation threshold for sensor applications — •Christian Pochstein, Vladimir Zaporojtchenko, Henry Greve, and Franz Faupel — Lehrstuhl für Materialverbunde, Technische Fakultät der CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany

Easy producible sensors for organic chemical vapor detection are of increasing interest for various applications. We have produced quasi two dimensional systems of noble metal (Au, Ag) clusters embedded in different polymer films (PMMA, PS, Nylon6). The polymer films were prepared via spin-coating in various thicknesses from 100 to 500 nm on different substrates. The clusters with the density near the percolation threshold were synthesized by the deposition of metal in high vacuum on the polymer surface. The threshold was determined by in-situ measurements of the electrical resistance. The size and density of the clusters were specified by TEM measurements. The time dependent resistance measurements showed that responses of the sensor-nanocomposite to different organic vapors depends on the composite conductivity, the polymer thickness and the vapor pressure. In addition the shift of the plasmon resonance due to the absorbance of the solvent vapor was observed by using UV-Visible spectroscopy.