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    Redox Properties of Polyvinylamine-g-TEMPO in Multilayer Films with Sodium Poly(styrenesulfonate)

    Year: 2017

    Journal: ACS Appl. Mater. Interfaces, Volume 9, FEB 15, page 5622–5628

    Authors: Fu, Qiang; Zoudanov, Igor; Gustafsson, Emil; Yang, Dong; Soleymani, Leyla; Pelton, Robert H.

    Keywords: redox polymers; polyelectrolyte multilayers; cyclic voltammetry; EQCM-D; TEMPO

    Layer-by-layer (LbL) assemblies of polyvinyl amine with grafted TEMPO moieties (PVArn-T) with sodium polystyrenesulfonate (PSS) were prepared on gold-sulfonate surfaces, and the redox properties were measured by cyclic voltammetry. LbL compositions were probed by quartz crystal microbalance (wet) and ellipsometric (dry) film measurements. Approximately 30% of the TEMPO moieties in the LbL assemblies were redox-active when the total TEMPO coverage was varied up to 6 mu mol/m(2), by either varying the TEMPO content in PVAm-T or by varying the number of LbL bilayers. non-redox-active PVAm/PSS blocking bilayers were required to prevent the electrode from oxidizing PVAm-T in the exterior LbL layer. This suggests significant intermixing between the layers in the LbL film. In addition to contributing to the small but growing body of work on redox polymers based on grafted TEMPO, this work serves as a reference point for understanding the redox properties of colloidal PVAm-T-laccase complexes in future work. Three
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