Simple Preparation Method of Multilayer Polymer Films Containing Pd Nanoparticles

摘要

A simple route to the fabrication of multilayer films containing Pd nanoparticles is des cribed. Following layer-by-layer assembly of PdCl_4~(2-) and polycation, QPVP-Os (a quaternized poly(4-vinylpyridine) complexes with [Os(bpy)_2Cl]~(2+/+), on 4-aminobenzoic acid-modified glassy carbon electrodes, the three-dimensional Pd nanoparticle multilayer films are directly formed on electrode surface via electrochemical reduction of PdCl_4~(2-) sandwiched between polymers. The growth of PdCl_4~(2-) is easy on electrode surfaces by electrostatic interaction, and the assembly processes are monitored by cyclic voltammetrya nd UV-vis spectroscopy. The depth profile analyses by X-ray photoelectron spectroscopy verify the constant composition of the Pd nanoparticle multilayer films. Atomic force microscopy proves that the as-prepared Pd nanoparticles are uniformly distributed with an average particle diameter of 3-7 nm. The resulting Pd nanoparticle multilayer-modified electrode possesses high catalytic activity for the reduction of dissolved oxygen and oxidation of hydrazine compounds in aqueous solution.