Preparation and electrocatalytic properties of multilayer composite films constructed from K_7[CuBW_(11)O_(39)]and poly(amidoamine)

The multilayer composite films consisting of K7[CuBW11O39] with Keggin structure and G4 poly(amidoamine)(PAMAM) dendrimer were fabricated on the ITO electrodes by layer-by-layer self-assembly technique.The obtained films were characterized by X-ray photoelectron spectroscopy(XPS),UV-Vis and atomic force microscopy(AFM).It was shown that the incorporation of [CuBW11O39]7-and PAMAM were alternately assembled into multilayer uniform films.The nanoparticles consisting of [CuBW11O39]7-assembled on PAMAM were homogeneous in size and highly dispersed.These particles size were 30-45nm in diameter and 25-45nm in height.Cyclic voltammetry showed that the multilayer films were stable and exhibited good catalytic activities for the reduction of nitrite in acidic aqueous solution.