Synthesis and catalytic properties of silver nanoparticle-linear polyethylene imine colloidal systems

Kelly De O. Santos, Welman C. Elias, Aline M. Signori, Fernando C. Giacomelli, Hong Yang, Josiel B. Domingos

Research output: Contribution to journalArticlepeer-review


The excellent catalytic properties of colloidal metal nanoparticles (M-NPs), such as good selectivity, efficiency, and recyclability, have attracted great interest in academic and industrial research. However, new M-NP stabilizers/supports still need to be developed and their performance needs to be better understood. Herein, we report an approach for effectively combining a high-throughput method using linear polyethylene imine (LPEI) with in situ screening and multivariate optimization of the synthesis conditions to produce highly catalytically stable Ag-NPs. Selected Ag-NP/stabilizers were able to efficiently catalyze the p-nitrophenol (Nip) reduction by NaBH 4 in water with a rate constant normalized to the surface area of the nanoparticles per unit volume (k 1) up to 1.66 s -1 m -2 L. A full kinetic analysis based on the Langmuir model indicates that the Nip molecules have a much stronger adsorption affinity than BH 4 - ions for the Ag-NP surface and all species are likely adsorbed and accommodated on the surface before they take part in any reaction.

Original languageEnglish (US)
Pages (from-to)4594-4604
Number of pages11
JournalJournal of Physical Chemistry C
Issue number7
StatePublished - Feb 23 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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