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Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

Abstract : We present and discuss the role of nanoparticles size and stoichiometry over the local atomic environment of nanostructured VOx films. The samples have been characterized in situ using X-ray absorption near-edge structure (XANES) spectroscopy identifying the stoichiometry-dependent fingerprints of disordered atomic arrangement. In vanadium oxides, the ligand atoms arrange according to a distorted octahedral geometry depending on the oxidation state, e.g. trigonal distortion in V2O3 and tetragonal distortion in bulk VO2. We demonstrate, taking VO2 as a case study, that as a consequence of the nanometric size of the nanoparticles, the original ligands symmetry of the bulk is broken resulting in the coexistence of a continuum of distorted atomic conformations. The resulting modulation of the electronic structure of the nanostructured VOx as a function of the oxygen content reveals a stoichiometry-dependent increase of disorder in the ligands matrix. This work shows the possibility to produce VOx nanostructured films accessing new disordered phases and provides a unique tool to investigate the complex matter.
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https://hal-cnrs.archives-ouvertes.fr/hal-03126254
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Submitted on : Tuesday, October 19, 2021 - 11:24:55 AM
Last modification on : Sunday, June 26, 2022 - 3:16:40 AM
Long-term archiving on: : Thursday, January 20, 2022 - 6:45:50 PM

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2021_JNanoRes_VOx.pdf
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A. D’elia, S. Rezvani, N. Zema, F. Zuccaro, M. Fanetti, et al.. Stoichiometry and disorder influence over electronic structure in nanostructured VOx films. Journal of Nanoparticle Research, Springer Verlag, 2021, 23 (1), pp.33. ⟨10.1007/s11051-020-05130-z⟩. ⟨hal-03126254⟩

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