Stabilization of silver nanoparticles by polyelectrolytes and polyethylene glycol

Darya Radziuk, Andre Skirtach, Gleb Sukhorukov, Dmitry Shchukin, Helmuth Möhwald

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


Silver nanoparticles of 23 nm size were formed by chemical reduction of silver nitrate in excess of aqueous sodium borohydride. To examine the aggregation behavior in NaCl solutions, they were coated with poly(diallyldimethy!ammonium chloride), poly(allylamine hydrochloride) and poly(ethylene glycol) by layer-by-layer assembly. Silver nanoparticles coated with PDADMAC of both high and low molecular weight revealed the lowest stability independent of salt concentration. Silver nanoparticles coated with PAH and PEG are stable in 0.1 or 0.01 M NaCl, whereas addition of 0.5 M NaCl destroys the colloidal solution. The destruction of silver agglomerates and the increase of monodispersity in the case of PEG coated silver nanoparticles were observed after heating at 90°C. In contrast, uncoated silver nanoparticles readily agglomerate and precipitate even after heating at 65°C.

Original languageEnglish
Pages (from-to)848-855
Number of pages8
JournalMacromolecular Rapid Communications
Issue number7
Publication statusPublished - 2 Apr 2007
Externally publishedYes


  • Layer-by-layer
  • Nanoparticle
  • Poly(ethylene glycol)
  • Polyelectrolyte
  • Stabilization


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