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Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

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Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

Dan Chena, Jun Penga, Haijun Panga, Pengpeng Zhanga, Yuan Chena, Yan Shena, Changyun Chena, and Huiyuan Mab

aKey Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin, 130024, P. R. China

bDepartment of Chemistry, Harbin Normal University, Harbin 150080, P. R. China Reprint requests to Dr. Jun Peng. E-mail: jpeng@nenu.edu.cn

Z. Naturforsch.2010,65b,140 – 146; received November 5, 2009

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4−/α- [PMo12O40]3−and methylene blue have been preparedviathe 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 an- tibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect againstEscherichia coli.

Key words:Thin Films, Polyoxometalates, Methylene Blue, Atomic Force Microscopy, Antibacterial Activity

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