Abstract
AbstractMorphological and organizational control afforded by polymerization at the air‐water interface, and the unique structural features of poly(N‐alkylaniline)s are exploited in the fabrication of the polymer and polymer‐nanoparticle composites in micro and nanofiber (ultrathin film) forms. While ammonium peroxodisulfate as the oxidizer provides poly(N‐octadecylaniline) (PNOA), chloroauric acid leads to the nanocomposite, PNOA_Au. Experiments using relatively larger amounts of the monomer in a petri‐dish produced PNOA and PNOA_Au microfibers that could be characterized using spectroscopy, microscopy and electrical conductivity measurement. Polymerization in monolayer Langmuir films under surface pressure control in a Langmuir‐Blodgett (LB) trough, allowed the kinetics to be monitored, and ultrathin films of PNOA and PNOA_Au to be fabricated. The PNOA LB film shows nanofibers with twists, turns and helical segments, aligned parallel to the direction of monolayer compression; a computational model suggests a helical chain structure for PNOA formed at the interface. The polymer nanofibers are decorated with Au nanoparticles in the PNOA_Au film.
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