Preparation of polymer-protected NiMoPt alloy nanoparticles dispersible in water over a wide pH range by a hot-soap method and ligand-exchange reaction

Takanori Imai, Yoshimoto Abe, Keishi Nishio, Ryuji Tamura, Hirobumi Shibata, Tohru Kineri, Satoru Tsukada, Takahiro Gunji

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The reduction of bis(acetylacetonato)platinum(II), nickel(II) acetate tetrahydrate and molybdenum(II) acetate dimer in a mixed solvent of oleylamine and diphenyl ether using 1,2-hexadecanediol resulted in the production of oleylamine-protected ternary alloy nanoparticles (nickel-molybdenum-platinum ternary alloy nanoparticles (NiMoPtNPs)). A ligand-exchange reaction with 50% N-methylated linear poly(ethyleneimine-co-N-methylethyleneimine) (poly(EI-co-NMEI)) in chloroform yielded poly(EI-co-NMEI)-protected NiMoPtNPs. The resultant nanoparticles had average diameters of 1.9-2.5 nm and could be dispersed in water at pH levels ranging from -1 to 14. The average radii of the NiMoPtNPs decreased when the protecting polymer was changed from oleylamine to poly(EI-co-NMEI). Energy-dispersive X-ray spectroscopy of the poly(EI-co-NMEI)-protected NiMoPtNPs was performed to confirm the formation of polymer-protected alloy nanoparticles of nickel, molybdenum and platinum.

Original languageEnglish
Pages (from-to)993-996
Number of pages4
JournalPolymer Journal
Issue number9
Publication statusPublished - 1 Sep 2013


  • Molybdenum
  • Nanoparticles
  • Nickel
  • Oleylamine
  • Platinum
  • Polyethyleneimine

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