Berlin 2005 – scientific programme

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DS: Dünne Schichten

DS 2: Elektrische und optische Schichteigenschaften

DS 2.3: Talk

Friday, March 4, 2005, 11:15–11:30, TU HS107

Effect of hot landing at elevated temperature and metal concentration on the optical and electrical properties of teflon AF -noble metal composites — •Haile Takele, Ulrich Schürmann, Henry Greve, Vladimir Zaporojtchenko, and Franz Faupel — Lehrstuhl für Materialverbunde, Technische Fakultät der CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany

Metal-Polymer nanocomposite films with embedded gold and silver nanoparticles were prepared by a vapor phase co-deposition technique in a high vacuum system[1,2]. The effect of hot landing at elevated temperature during deposition on the microstructure of the composite films was investigated using top view and cross-sectional transmission electron microscopy. The resulting changes in the optical properties of the composites as function of the substrate temperatures were studied using UV-Visible spectroscopy. A large shift of the surface plasmon peak position and a sharp transition in the electrical properties of the composites from insulator to conductor near the percolation point were observed for samples having a metal volume fraction ranging from 0.15 to 0.75. The metal volume fraction was measured by using SEM/EDX. Photoelectron spectroscopy and Fourier transform infrared spectroscopy are also applied to study the chemical composition and structure of the composite.

[1] A. Biswas, O. C. Aktas, J. Kanzow, U. Saeed, T. Strunkus, V. Zaporojtchenko, F. Faupel, Materials Letters, 58, 1530 (2004).

[2] A. Biswas, O. C. Aktas, U. Schürmann, U. Saeed, V. Zaporojtchenko, and F. Faupel,Appled Physics Letters 84, 2655 (2004).