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- Title
Stoichiometry and disorder influence over electronic structure in nanostructured VOx films.
- Authors
D'Elia, A.; Rezvani, S. J.; Zema, N.; Zuccaro, F.; Fanetti, M.; Belec, B.; Li, B. W.; Zou, C. W.; Spezzani, C.; Sacchi, M.; Marcelli, A.; Coreno, M.
- 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.
- Subjects
ELECTRONIC structure; NANOPARTICLE size; VANADIUM oxide; ELECTRONIC modulation; X-ray absorption; STOICHIOMETRY
- Publication
Journal of Nanoparticle Research, 2021, Vol 23, Issue 1, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-020-05130-z