A Surface Study of Ultrathin Ceria Nanoparticles Decorated with Transition-Metal Ions

Helena Fridman, Mahmud Diab, Michael Volokh, Alexander I. Shames, Sofiya Kolusheva, Taleb Mokari

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A wide range of nanoparticle properties can be tuned by changing their surface characteristics, especially when dealing with ultrathin nanomaterials. Surface modification with transition-metal ions may affect a variety of the nanoparticles' properties including the surface charge, the electronic structure, and the electrical and optical characteristics. In this work, a surface study of ceria nanoparticles modified by attachment of various transition-metal ions to their surface is conducted. Characterization of the decorated particles as well as of the modifying transition-metal ion is carried out using zeta potential in organic solution, UV–Vis absorption, and electron paramagnetic resonance measurements, together with isothermal titration calorimetry, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. All measurements confirm the attachment of the cation to the surface of ceria, both in solid state and in colloidal suspension. It is suggested that the modifying ion-complex attaches to ceria both via chemical or strong physical interactions and weak physical interactions, demonstrated by a case-study modification of ceria using a copper-oleylamine complex. The metalization has a significant effect on the surface charge of the nanoparticles by shifting the zeta potential to more positive values and on the optical properties of the modifying transition-metal ions by red-shifting their absorption peak.

Original languageEnglish
Article number1800452
JournalParticle and Particle Systems Characterization
Volume36
Issue number3
DOIs
StatePublished - 1 Mar 2019

Keywords

  • cerium oxide
  • ion attachment
  • nanoparticle-ion interface
  • surface modification
  • zeta potential

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