In the work polypyrrole (PPy) - Pt nanocomposites have been obtained by: 1) doping of PPy with Pt ions in PtCl4 aqueous solution followed by reduction with NaBH4, 2) reduction of Pt ions from PtCl4 aqueous solution with NaBH4 in the presence of PPy, 3) incorporation of Pt particles into PPy from Pt aqueous sol. The prepared composites have been characterized by X-ray diffraction as well as scanning and transmission electron microscopies. This has allowed us to establish that in all the materials prepared, crystalline metallic Pt phase has been present. Size of the crystallites depends on the method of synthesis: the smallest ones (4-10 nm) have been in the composites prepared by method 3. Catalytic properties of PPy-Pt nanocomposites have been investigated using isopropyl alcohol conversion as the test reaction. It has been found that PPy-Pt nanocomposite prepared by method 3 has shown the highest activity, giving mainly the redox product, i.e. acetone. In the presence of this nanocomposite cyclohexene oxidation has been also investigated. This process leads predominantly to the formation of the epoxy compound. Agnieszka Sniechota thanks the Scientific Network: "Nanomaterials as Catalysts for New, Environmentally Friendly Processes" for financing her participation in E-MRS Fall Meeting 2006, Symposium B.

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1. Pt L₂ and L₃ Absorption Studies of Pt-doped Polymers