Structural and physical-chemical characterization of redox active CeO2nanoparticles synthesized by precipitation in water-alcohol solutions

Yuliia Shlapa, Illia Timashkov, Katerina Veltruska, Katarina Siposova, Ivana Garcarova, Andrey Musatov, Sergii Solopan, Martina Kubovcikova, Anatolii Belous

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A set of cerium dioxide nanoparticles (CeO2NPs) was synthesized by precipitation in water-alcohol solutions under conditions when the physical-chemical parameters of synthesized NPs were controlled by changing the ratio of the reaction components. The size of CeO2 NPs is controlled largely by the dielectric constant of the reaction solution. An increase of the percentage of Ce3+ ions at the surface was observed with a concomitant reduction of the NP sizes. All synthesized CeO2 NPs possess relatively high positive values of zeta-potential (ζ > 40 mV) suggesting good stability in aqueous suspensions. Analysis of the valence- and size-dependent rate of hydrogen peroxide decomposition revealed that catalase/peroxidase-like activity of CeO2 NPs is higher at a low percentage of Ce3+ at the NP surface. In contrast, smaller CeO2 NPs with a higher percentage of Ce3+ at the NP surface display a higher oxidase-like activity.

Original languageEnglish (US)
Article number315706
JournalNanotechnology
Volume32
Issue number31
DOIs
StatePublished - Jul 1 2021
Externally publishedYes

Keywords

  • catalase/peroxidase activity
  • cerium dioxide nanoparticles
  • chemical state
  • morphology
  • synthesis
  • zeta-potential

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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