Effect of temperature on the synthesis of silver nanoparticles with polyethylene glycol: new insights into the reduction mechanism

Noralvis Fleitas-Salazar, Erika Silva-Campa, Seidy Pedroso-Santana, Judith Tanori, Martín R. Pedroza-Montero, Raúl Riera*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Polyethylene glycol (PEG) molecules act as a reducing and stabilizing agent in the formation of silver nanoparticles. PEG undergoes thermal oxidative degradation at temperatures over 70 °C in the presence of oxygen. Here, we studied how the temperature and an oxidizing atmosphere could affect the synthesis of silver nanoparticles with PEG. We tested different AgNO3 concentrations for nanoparticles syntheses using PEG of low molecular weight, at 60 and 100 °C. At the higher temperature, the reducing action of PEG increased and the effect of PEG/Ag+ ratio on nanoparticles aggregation changed. These results suggest that different synthesis mechanisms operate at 60 and 100 °C. Thus, at 60 °C the reduction of silver ions can occur through the oxidation of the hydroxyl groups of PEG, as has been previously reported. We propose that the thermal oxidative degradation of PEG at 100 °C increases the number of both, functional groups and molecules that can reduce silver ions and stabilize silver nanoparticles. This degradation process could explain the enhancement of PEG reducing action observed by other authors when they increase the reaction temperature or use a PEG of higher molecular weight.

Original languageEnglish
Article number113
JournalJournal of Nanoparticle Research
Volume19
Issue number3
DOIs
StatePublished - 1 Mar 2017

Bibliographical note

Publisher Copyright:
© 2017, Springer Science+Business Media Dordrecht.

Keywords

  • Free radical
  • Polyethylene glycol
  • Reduction mechanism
  • Silver nanoparticles
  • Temperature effect
  • Thermal oxidative degradation

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