Title: Size Dependence of Lattice Parameter and Electronic Structure in CeO2 Nanoparticles
Authors: PRIEUR DAMIENBONANI WALTERPOPA KARINWALTER OLAFKRIEGSMAN KYLE W.ENGELHARD MARK H.GUO XIAOFENGELOIRDI RACHELGOUDER THOMASBECK AARONVITOVA TONYASCHEINOST ANDREASKVASHNINA KRISTINAMARTIN PHILIPPE
Citation: INORGANIC CHEMISTRY vol. 59 no. 8 p. 5760-5767
Publisher: AMER CHEMICAL SOC
Publication Year: 2020
JRC N°: JRC119758
ISSN: 0020-1669 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC119758
DOI: 10.1021/acs.inorgchem.0c00506
Type: Articles in periodicals and books
Abstract: Intrinsic properties of a compound (e.g. electronic structure, crystallographic structure, optical and magnetic properties) define notably its chemical and physical behavior. In the case of nanomaterials, these fundamental properties depend on the occurrence of quantum mechanical size effects and on the considerable increase of the surface to bulk ratio. However, the literature on this size-dependence and on the involved mechanisms is quite elusive and scarce. Here, we explore the size-dependence of both crystal and electronic properties of CeO2 nanoparticles (NPs) with different sizes by state-of-the art spectroscopic techniques. XRD, XPS and HERFD-XANES demonstrate that the as-synthesized NPs crystallize in the fluorite structure and they are predominantly composed of CeIV ions. The strong dependence of the lattice parameter with the NPs size was attributed to the presence of adsorbed species at the NPs surface thanks to FTIR and TGA measurements. In addition, the size-dependence of the t2g level in the Ce LIII XANES spectra was experimentally observed by HERFD-XANES and confirmed by theoretical calculations.
JRC Directorate:Nuclear Safety and Security

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