The kinetics of homogeneous nucleation of silver nanoparticles stabilized by polymers

Rita Patakfalvi, Szilvia Papp, Imre Dékány

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

The formation of Ag nanoparticles synthesized by homogeneous nucleation, stabilized by polymers (PVA and PVP) was monitored by UV-Vis spectrophotometry and transmission electron microscopy. Our aim was to differentiate between the two main phases of particle formation, i.e. nucleation and growth and to characterize their rates with the help of appropriate kinetic equations. Time resolved spectrophotometric measurements revealed that particle formation is an autocatalytic process: a slow, continuous nucleation phase (3-5 min) is followed by a rapid, autocatalytic growth phase where the maximal particle size is 5-7 nm. By freezing the reaction mixture, the process of particle growth can be followed from 5 to 40 min on TEM pictures. The first order rate constants were calculated and they are strongly depend on the polymer concentration. If the growing particles are attached by PEI to the surface of a solid support, the formation of silver nanoparticles can also be followed by atomic force microscopy (AFM) and we can control the particle growth on mica surface. The cross section analysis of the pictures show, that the particle growing process can be also monitored at solid-liquid interface.

Original languageEnglish
Pages (from-to)353-364
Number of pages12
JournalJournal of Nanoparticle Research
Volume9
Issue number3
DOIs
Publication statusPublished - Jun 1 2007

Keywords

  • AFM
  • Colloids
  • Nanocomposites
  • Nucleation and growth
  • Silver nanoparticle
  • TEM
  • UV-Vis spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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