Synthesis of Platinum Nanoparticles by Reductive Crystallization Using Polyethyleneimine

Hideyuki Nagao*, Masumi Ichiji, Izumi Hirasawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Sub-10-nm-sized Pt nanoparticles were synthesized by reducing Pt ions with NaBH4, with the addition of polyethyleneimine (PEI) as a protective reagent. Well-dispersed Pt nanoparticles with a narrow size distribution were successfully produced. When lowering the pH of the PEI solution, cubic and tetrahedral nanoparticles were observed, while at a higher pH, only spherical nanoparticles were produced. In addition, by selecting a suitable concentration of PEI, the protective reagent itself can reduce Pt ions to generate Pt nanoparticles with diameters in the range of 12.9–70.7 nm. This shows the potential of one-pot synthesis of Pt nanoparticles by just adding Pt ions and PEI.

Original languageEnglish
Pages (from-to)1242-1246
Number of pages5
JournalChemical Engineering and Technology
Issue number7
Publication statusPublished - 2017 Jul


  • Crystal size distribution
  • Platinum nanoparticles
  • Polyethyleneimine
  • Reductive crystallization

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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