Abstract
The novel multilayer nano-composite films consisting of vanadium mono-substituted polyoxometalates (PMo11VO(superscript 4- subscript 40)) and a generation-4 poly (amidomine) (PAMAM) dendrimer were fabricated on quartz and glassy carbon electrode substrates by layer-by-layer self-assembly technique. The incorporation of PMo11VO(superscript 4- subscript 40) and PAMAM into the films was confirmed by XPS. The multilayer films were grew gradually and uniformly in the synthesis process as monitored by UV-Vis and cyclic voltammetry. Four pairs of redox peaks which corresponded to V(superscript 5+)/N(superscript 4+) and Mo(superscript 6+)/Mo(superscript 5+) were observed in the cyclic voltanunogram of multilayer films. The dependence of peak current on scan rate was indicative of redox surface-confined species and the charge transfer was very quick. The formal potential of the composite films was shifted linearly to negative position at higher pH, which implied that the protons were involved in the redox processes of polyoxometalates. The multilayer films were stable and exhibited good catalytic activities for the reduction of NO(superscript - subscript 2) BrO(superscript - subscript 3), and H2O2.
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