HOMO-EPITAXY OF DIACETYLENE VAPOR-DEPOSITION FILM ON AN ORIENTED LANGMUIR MONOLAYER

Inplane-oriented polydiacetylene thin films are prepared by vapor deposition of a urethane-substituted diacetylene monomer on a highly oriented polydiacetylene Langmuir monolayer. Structural and morphological investigations of the overgrown polydiacetylene thin film are carried out using polarized absorption spectroscopy, X-ray diffraction, and optical and electron microscopy. The pi-conjugated backbone chains of the overgrown polydiacetylene thin film are aligned in the same direction as those of the underlying oriented polydiacetylene monolayer, i.e. uniaxial-oriented overgrowth "epitaxy". Two dimensional lattice matching is confirmed in the contact face. Moreover, there is evidence of uniaxially oriented overgrowth along the linear textile structures such as line defects, which are contained in the underlying uniaxially oriented Langmuir monolayer.