Co-polyphosphazenes containing anchored organometallic fragments are useful precursors for nanostructured metallic materials. Pyrolysis in air at 800°C yields metallic nanoparticles of the type, M°/M x O y /M z (P x O y )/P4O7, depending on the metal used; i.e., M° when the metal is a noble metal, metal oxide when the metal is Cr, W and Ru, metallic pyrophosphate when M = Mn and Fe. The organic spacer of the polyphosphazene influences strongly the morphology of the pyrolytic product. The mechanism of formation of the nanostructured materials involves carbonization of the organic matter, which produces holes where the nanoparticles are grown. Reaction of the phosphorus polymeric chain with O2 yield phosphorus oxide units, which act as a P4O7 matrix to stabilize the nanoparticles and/or P x O −n y for the formation of metallic pyrophosphates. The method appears to be a general and versatile new route to metallic nanostructured materials.
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We acknowledge with thanks the financial support under FONDECYT Project 1030515.
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Dedicated to Professor Harry Allcock for his pioneering and persevering work on Polyphosphazene and their projection in another field as materials and recently nanomaterials.
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Díaz, C., Valenzuela, M.L. Organometallic Derivatives of Polyphosphazenes as Precursors for Metallic Nanostructured Materials. J Inorg Organomet Polym 16, 419–435 (2006). https://doi.org/10.1007/s10904-006-9058-3
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DOI: https://doi.org/10.1007/s10904-006-9058-3