Assembly, electrochemical characterisation and electrocatalytic ability of multilayer films based on [Fe(bpy)3]2+, and the Dawson heteropolyanion, [P2W18O62]6−

In our paper we report on the formation of extremely stable multilayer films based upon the parent Dawson type HPA, 6-, and 2+

Nigel Fay; Eithne Dempsey; Timothy McCormac

2004

Scholarcy highlights

  • Over the past several years, there has been a great deal of interest in the self-assembly of ordered molecular arrays formed spontaneously as monolayers on solid surfaces upon immersion in a solution of the respective adsorbate molecules
  • The technique of consecutive adsorption of anionic and cationic layers has been well documented by, for example, Decher et al who reported on various systems involving these electrostatic interactions
  • Kulesza et al described the use of Keggin HPAs as inorganic templates for monolayers and multilayers of ultrathin polyaniline
  • Wang et al recently reported on the self-assembly of multilayer films based on a Keggin-type polyoxometalate, namely SiW12O404, and polyaniline
  • In our paper we report on the formation of extremely stable multilayer films based upon the parent Dawson type HPA,6, and2+
  • Electrodes coated with multilayer films were examined by cyclic voltammetry in the presence of potassium ferricyanide, K3Fe(CN)6, which undergoes a one-electron reduction at less negative potentials than those associated with tungsten-oxo cage of the heteropolyanion within the multilayer system
  • These multilayers were shown to exhibit the same pH dependence of the tungsten-oxo framework of the HPA in solution, and were seen to maintain the same scan rate characteristics of thin films of these types of compounds

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