A novel biological active multilayer film based on polyoxometalate with pendant support-ligand

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• 作者：Huiyuan Ma ; Jun Peng ; Zhangang Han ; Xia Yu and Baoxia Dong
• 关键词：Layer-by-layer self-assembly ; Polyoxometalate ; Film ; DNA chip
• 刊名：Journal of Solid State Chemistry
• 出版年：2005
• 出版时间：December 2005
• 年：2005
• 卷：178
• 期：12
• 页码：3735-3739
• 全文大小：301 K

文摘

A novel nanosized biological active multilayer film composed of polyoxometalate (POM) anion α-[SiW₁₁O₃₉Co(H₂PO₄)]⁷⁻(abbr. SiW₁₁Co–PO₄) and poly(diallyldi methylammonium chloride) (abbr. PDDA) was fabricated by layer-by-layer self-assembly (LBL). The composition and growth processes of the films have been determined by X-ray photoelectron spectra (XPS) and ultraviolet-visible absorption spectra (UV). The composite film was formed by the alternate adsorption of SiW₁₁Co–PO₄ and PDDA, and the deposition process was quantitative and highly reproducible from layer to layer. The morphology of the film was studied by atomic force microscopy (AFM), which showed that the film was relatively uniform and smooth, and POM anions aggregated into nanoclusters distributing on the surface uniformly. The film exhibited favorable electrochemical behavior of POM indicated by cyclic voltammetry (CV). The film can immobilize the DNA molecules via Mg²⁺-bridging medium.