Fabrication and characterization of antibacterial-active multilayer films based on keggin polyoxometalates and methylene blue

Abstract

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4-/α-[PMo 12O40]3- and methylene blue have been prepared via the layer-by-layer (LBL) self-assembly technique. The multilayer films were characterized by UV/Vis spectra, atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS). The cyclic voltammetry (CV) measurements have demonstrated that the electrochemical properties of POMs are maintained in the LBL films. The antibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect against Escherichia coli. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.