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    Modulation of the internal structure and surface properties of natural and synthetic polymer matrices by graphene oxide doping

    Year: 2020

    Journal: Polym. Adv. Technol., Volume 31, JUL, page 1562–1570

    Authors: Andreeva, Tonya D.; Der, Andras; Kelemen, Lorand; Krastev, Rumen; Taneva, Stefka G.

    Keywords: composite materials; graphene oxide; polyelectrolyte multilayers; thin coatings

    Controlling the surface properties and structure of thin nanosized coatings is of primary importance in diverse engineering and medical applications. Here we report on how the nanostructure, growth mechanism, thickness, roughness, and hydrophilicity of nanocomposites composed of weak natural or strong synthetic polyelectrolytes (PE) can be tailored by graphene oxide (GO) doping. GO reverses the build-up mechanism affecting the internal structure and the hydrophilicity in a way depending on the type of the PE-matrix. The extent of GO-adsorption and its impact on the surface morphology was found to be independent on the type of the underlying PE-matrix. The nanostructure of the hybrid films is not significantly altered when a single surface-exposed GO-layer is deposited, while increasing the number of embedded GO-layers leads to pronounced surface heterogeneity. These results are expected to have valuable impact on the construction strategies of coatings with tunable surface properties.
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