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A Surface Study of Ultrathin Ceria Nanoparticles Decorated with Transition‐Metal Ions
Author(s) -
Fridman Helena,
Diab Mahmud,
Volokh Michael,
Shames Alexander I.,
Kolusheva Sofiya,
Mokari Taleb
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201800452
Subject(s) - zeta potential , surface charge , nanoparticle , x ray photoelectron spectroscopy , materials science , surface modification , absorption spectroscopy , inorganic chemistry , chemical engineering , chemical physics , analytical chemistry (journal) , chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , engineering
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.