Regensburg 2007 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: Polymer and Composite Films

DS 27.4: Talk

Friday, March 30, 2007, 10:15–10:30, H32

2-dimensional metal/polymer nanocomposites near the percolation threshold as sensors for organic vapor — •Christian Hanisch, Amit Kulkarni, Vladimir Zaporojtchenko, and Franz Faupel — Lehrstuhl für Materialverbunde, Technischeu Kiel, Kaiserstraße 2, 24143 Kiel Fakultät der Christian Albrechts Universität zu Kiel, Kaiserstraße 2, 24143 Kiel

Low cost reversible sensors for organic vapor detection are of increasing interest for various applications. We have produced quasi two dimensional systems of Au clusters embedded in different polymer films (PMMA, PS). The polymer films were prepared via spin-coating in various thickens from 100 to 500 nm on different substrates. The clusters were prepared by the deposition of metal in high vacuum on the ion-beam pretreated polymer surface near the percolation threshold. The threshold was determined by in-situ measurements of the electrical resistance as well as TEM measurements. The shape and size of the clusters were specified by TEM measurements. After embedding of the clusters, vapor concentrations down to a few ppm could be detected and the signal change was reversible. The time dependent resistance measurements showed that the sensitivity of the sensor depends on the film thickness of the polymer as well as on the type of vapor used. By comparison of the two polymer substrates we could show that each polymer exhibits a different sensitivity to the used gases, which leads to the possibility of creating an electronic nose by combining different polymer substrates in an sensor array.