Microflow reactor synthesis of palladium nanoparticles stabilized with poly(benzyl ether) dendron ligands

Kanjiro Torigoe, Yohsuke Watanabe, Takeshi Endo, Kenichi Sakai, Hideki Sakai, Masahiko Abe

Research output: Contribution to journalArticle

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A simple glass capillary microflow reactor system has been applied for the synthesis of palladium nanoparticles by thermal decomposition of palladium acetate (Pd(OAc)2) in diphenyl ether in the presence of poly(benzyl ether) dendron ligands (PBED Gn-NH2, n = 1-3) as a stabilizer. Effect of hydrodynamic parameters (capillary diameter, linear flow rate, volume flow rate, and reaction temperature) and concentrations (precursor and stabilizer) on the particle size was investigated. The particle size can be controlled by varying linear flow rate and temperature as well as ligand/precursor concentration ratio. Volume flow rate does not affect the particle size when the linear flow rate is held constant for different capillary diameters (150-320 μm). Unlike batch systems, in this microreactor system, smaller particles are produced at low ligand concentrations when the molar ratio of the ligand tometal precursor ranged from1 to 5. As another characteristic of the microreactor synthesis, the concentration of the Pd precursor can be increased (up to 27 mM) with maintaining a constant particle size (3.1 ± 0.2 nm) and a good monodispersity, while in the batch system a significant increase and broadening in the particle size are observed with increasing precursor concentration.

Original languageEnglish
Pages (from-to)951-960
Number of pages10
JournalJournal of Nanoparticle Research
Issue number3
Publication statusPublished - 1 Mar 2010


  • Dendron ligand
  • Microflow reactor
  • Microfluidics
  • Nanomanufacturing
  • Palladium nanoparticles
  • Thermal decomposition

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