INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
PM-IRRAS Spectoelectrochemistry of hexacyano-ferrate films in layer-by-layer polyelectrolyte multilayers
VILLALBA, MATIAS A.; LUCILA P. MÉNDEZ DE LEO; ERNESTO J. CALVO
Año: 2014 vol. 1 p. 195 - 195
In situ polarization modulation infrared reflection absorption spec-troscopy (PM-IRRAS) under potential control has been used to study self-assembled layer-by-layer poly(allylamine) and poly(acrylic acid) multilayers on conductive substrates containing hexacyanoferrate redox system. Two systems were examined, which differ in the way the redox complex is entrapped in the LbL polyelectrolyte multilayer: In system I the LbL polyelectrolyte multilayer self-assembled by alternate immersion in poly(allylamine), PAH, and poly (acrylic acid), PAA, respectively was then exchanged in 2 mM K3Fe(CN)6 solution of pH 3.5 for 30 minutes and then thoroughly rinsed with water. In system II 2 mM K3Fe(CN)6 was complexed with poly(allylamine) prior to self-assembly with poly(acrylic acid). PM-IRRAS reported the potential dependence of vibrational modes for the polyelectrolyte backbones and CN stretching modes which are sensitive to the redox charge in the iron center.