title: Polyoxometallates as inorganic templates for electrocatalytic network films of ultra-thin conducting polymers and platinum nanoparticles.
abstract: We develop a concept of fabrication of the multilayer network films on electrodes by exploring the ability of a Keggin-type polyoxometallate, phosphododecamolybdate (PMo(12)O(40)(3-)), to form stable anionic monolayers (templates) on carbon and metals including platinum. By repeated alternate treatments in the solution of PMo(12)O(40)(3-) (or in the colloidal suspension of polyoxometallate-protected Pt-nanoparticles) and in the solution of monomer (e.g. anilinium) cations, the amount of the material can be increased systematically (layer-by-layer) to form stable three-dimensional assemblies on electrode (e.g. glassy carbon) surfaces. In the resulting hybrid (organic-inorganic) films, the layers of negatively charged polyoxometallate, or polyoxometallate-protected (stabilized) Pt-nanoparticles, are linked or electrostatically attracted by ultra-thin layers of such positively charged conducting polymers as polyaniline (PANI), polypyrrole (PPy) or poly(3,4-ethylenedioxythiophene), PEDOT. Consequently, the attractive physicochemical properties of polymers and reactivity of polyoxometallate or noble metal particles are combined. The films are functionalized and show electrocatalytic properties towards reduction of nitrite, bromate, hydrogen peroxide or oxygen. They are of importance to the chemical and biochemical sensing as well as to the biochemical and medical applications.
authors.affiliation: Department of Chemistry, University of Warsaw, Pasteura 1, Warsaw PL-02-093, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Karnicka
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Chojak
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Miecznikowski
authors.forename: Magdalena
authors.initials: M
authors.lastname: Skunik
authors.forename: Beata
authors.initials: B
authors.lastname: Baranowska
authors.forename: Aneta
authors.initials: A
authors.lastname: Kolary
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Piranska
authors.forename: Barbara
authors.initials: B
authors.lastname: Palys
authors.forename: Lidia
authors.initials: L
authors.lastname: Adamczyk
authors.forename: Pawel J
authors.initials: PJ
authors.lastname: Kulesza
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D015374:Biosensing Techniques; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry; D001959:Bromates / Q000737:chemistry; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D008567:Membranes, Artificial; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides; D010756:Phosphoric Acids / Q000737:chemistry*; D017553:Phosphorus Compounds; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry
chemical_list: C450141:(PMo12O40)3-; D000814:Aniline Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D001959:Bromates; D008567:Membranes, Artificial; D009566:Nitrates; D010087:Oxides; D010756:Phosphoric Acids; D017553:Phosphorus Compounds; D011108:Polymers; D011758:Pyrroles; C121383:poly(3,4-ethylene dioxythiophene); C416807:polyaniline; C067635:polypyrrole; D010984:Platinum; D008982:Molybdenum