Photo-promoting fabrication of silver nanoparticles in the presence of anthracenyl-focal PAMAM dendrons

Chisato Hirano, Toyoko Imae, Yasushi Yanagimoto, Yutaka Takaguchi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Silver nanoparticles protected by first to third generation poly(amido amine) dendrons with an anthracenyl-focal point were fabricated by photo-promotion of silver ions in aqueous dendron solutions. The reaction solutions colored from light to deep brown and displayed a broad plasmon band at 450nm, indicating the formation of silver nanoparticles. The formation of particles progressed with time, although it slowed down at the light-shielding (dark) condition. The light-promoted electron transfer from amine groups of dendron to silver ions through anthracenyl moiety might concern to the formation of silver nanoparticles. According to the images of transmission electron microscopy, the shape of nanoparticles was not only spherical (15-20 nm in size) but also polygonal (20-35 nm in size). It was confirmed from the crystallographic analysis of electron diffraction patterns that the polygon was a hexagonal-close-packing (hcp) single crystal, whereas the crystal structure of spherical nanoparticles was face-centered-cubic (fee). The reaction was fastest when the second generation dendron was used, indicating the competition of increasing number of amine groups and reducing efficiency of photo-promoted electron transfer with generation.

Original languageEnglish
Pages (from-to)44-49
Number of pages6
JournalPolymer Journal
Volume38
Issue number1
DOIs
Publication statusPublished - Mar 7 2006

Keywords

  • Anthracene
  • Anthracenyl-focal Poly(amido amine) Dendron
  • Electron Diffraction
  • Face-centered-cubic
  • Hexagonal-close-packing
  • Nanoparticle
  • Photo-fabrication
  • Photo-induction
  • Poly(amido amine) Dendron
  • Silver Nanoparticle
  • Transmission Electron Microscopy

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

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