2-COMPONENT LANGMUIR AND LANGMUIR-BLODGETT-FILMS CONTAINING MONOMERICAND POLYMERIC ALKYLHETEROAROMATES - SURFACE-PLASMON RESONANCE AND ELECTRICAL-CONDUCTIVITY

Langmuir film formation was investigated in a series of alkylheteroaro matic compounds and their mixtures. In the case of pure amphiphilic mo lecules, the shape and nature of the hydrophilic group seems to play a decisive role in the film formation; however, in binary systems a pos itive synergy was observed allowing to obtain two-component film of re asonable quality even if one or both the components separately manifes ted moderate or weak ability for film formation. Compression and depos ition of mixtures of poly( 3-n-alkylthiophenes) with suitable builders is described. The thicknesses of the binary LB films, determined from the measurements of tile surface plasmon resonance, are controlled by the packing of the film builder. The optical and electrical propertie s of the Langmuir-Blodgett films are modified by the presence of nitro gen oxides. The overall effect is probably due to two competing proces ses: doping of the polymer and an irreversible reaction destroying the conjugated chain.