01708naa a2200193 a 450000100080000000500110000800800410001910000190006024501320007926000090021152011130022065000150133365300160134865300110136465300160137565300240139170000220141577300770143710246092003-04-25       2002    bl ---       0--  u    #d1 aPATERNO, L. G.  aInfluence of different dopants on the adsorption, morphology, and properties of self-assembled films jof poly(o-ethoxyaniline).  c2002  aSelf-assembled films of poly(o-ethoxyaniline)-POEA alternated with sulfonated lignin (SL)-were sucessfully produced, and their kinetics of formation and growth investigated for different dopants (hydrochloric acid, methanesulfonic acid, p-toluenesulfonic acid, and camphosrsulfonic acid). These films were characterized by ultraviolet-visible spectroscopy, atomic force microscopy, surface potential, and electrical resistance measurements. It has been observed that the bulkiest dopants led to a greater time for the polymer deposition and greater abount of material adsorbed. This can be explained by the lower mobility and lower solvation of the bulkiest dopant counterions, which led to a higher screening effect of the charges present in the POEA chains and therefore to a more compact molecular conformation. The morphology of the POEA films were also gratly affected by the type of dopant used, being rougher for the bulkiest dopants. The POEA films also exhibited different electrical responses upon ethylene exposure depending on the dopant, indicating a promissing user for gas sensor applications.  aadsorption  aDerivatives  aDopant  aPolyaniline  aSelf-assembly films1 aMATTOSO, L. H. C.  tJournal of Applied Polymer Science, New Yorkgv. 83, p. 1309-1316, 2002.