Orientation of thin films of conjugated systems by different techniques

Oriented thin films of good optical quality are necessary for applications of conjugated systems in non linear optical devices. In this paper, we focu s on the preparation and spectroscopic characterization of thin films of tw o different polymers, a polydiacetylene, poly[9-(N-carbazolyl)-2,4-hexadyin e-1-ol-1, ethylurethane] (pCNEU) and a polyphenylene-ethynylene, the (11-un decanol) benzoate containing polymer (pPEn). pCNEU gives the best orientati on by epitaxial growth on polytetrafluoroethylene (PTFE) layers aligned on glass. On the contrary pPEn is best oriented on glass substrates by rubbing technique. (C) 2001 Elsevier Science B.V. All rights reserved.