One-Step Synthesis of a Platinum Nanoparticle with Carbon Materials Using a Phenylazomethine Dendrimer as a Template

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  • Enoki Osamu
    Department of Chemistry, Faculty of Science and Technology, Keio University
  • Imaoka Takane
    Department of Chemistry, Faculty of Science and Technology, Keio University
  • Yamamoto Kimihisa
    Department of Chemistry, Faculty of Science and Technology, Keio University

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Abstract

A phenylazomethine dendrimer was developed for the one-step preparation of a platinum nanoparticle–carbon nanocomposite. The dendrimer formed a complex with platinum tetrachloride (PtCl4) in a chloroform–acetonitrile mixed solvent. The coordination behavior between the dendrimer and the platinum salts was confirmed by UV–vis and 1H NMR titration experiments. The obtained dendrimer–PtCl4 complexes were pyrolyzed under a nitrogen atmosphere at 1000 °C, and converted to spherical and dispersed platinum nanoparticles on a pyrolytic graphite identified by transmission electron microscopy (TEM). A high resolution TEM (HR-TEM) image of the products showed some lattice fringes attributed to the presence of Pt(111) in the particles, and X-ray photoelectron spectra (XPS) of the products corresponded to those of Pt(0). These results indicated that PtCl4 was perfectly converted to metallic platinum through this pyrolysis condition. Raman spectra showed that the dendrimer remained as an amorphous carbon after pyrolysis. The electrode modified with the product showed a catalytic activity for dioxygen reduction, which electrochemically confirmed that part of the carbon was porous enough to let the substrate go through and to reach the platinum surface.

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