Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTER: Biological Systems + New Materials

CPP 20.21: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Self organization and light induced patterning of azo-dye layers — Rafael Meinhardt, Vladimir Muradov, •Ansgar Draude, and Hilmar Franke — Department of applied physics, university of Duisburg-Essen, Lotharstr.1, 47057 Duisburg, Germany

Thin layers of azo-dyes have been prepared from the vapour phase on pure glass, metal/ glass and ITO/ glass substrates. The films have been patterned using light or electrostatic charging of the substrate. As characterization methods plasmon spectroscopy, AFM investigations, X-ray scattering and holographic recording have been used.

A strong tendency for the formation of crystals is found especially in the range of 20-70 nm thick depositions. The crystallization depends on the roughness of the substrate and the presence of deposited electrostatic charges. Oriented transparent regions may be prepared as well as scattering unoriented areas. Both types of layers are sensitive for an optical reorientation via the Cis-Trans isomerization.