Fabrication of polycondensed multilayer thin films by a self-assembly method

Polycondensed thin films which had a high-ordered structure were fabricated from dicarboxylic acid and diamines using N-hydroxysuccinimide (NHS) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) as condensing agents by a self-assembly method. In this study, adipic acid (ADA) or 9,11-docosadiyn-1,20-dicarboxylic acid (DDyDA) were selected for dicarboxylic acid, and 4,4′-diaminodiphenylmethane dihydrochloride (DAM) for diamine parts. and quartz crystal microbalance (QCM) measurements were used to monitor the layer-by-layer deposition process. FT-IR reflection absorption spectroscopy (FT-IR-RAS) was also carried out in order to confirm the polycondensation of monomers. These results indicated that dicarboxylic acid and diamines were alternately deposited and polymerized with condensing agents on nano-scale. In addition, polydiacetylene network was successfully incorporated in DDyDA system by γ-irradiation due to the high ordered structure.