Affordable Access

Access to the full text

Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

  • D’Elia, A.1, 2
  • Rezvani, S. J.2, 3
  • Zema, N.4
  • Zuccaro, F.5
  • Fanetti, M.6
  • Belec, B.6
  • Li, B. W.7
  • Zou, C. W.7
  • Spezzani, C.8
  • Sacchi, M.9, 10
  • Marcelli, A.3, 5, 11
  • Coreno, M.5
  • 1 II Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, Köln, 50937, Germany , Köln (Germany)
  • 2 IOM-CNR, Basovizza SS-14, km 163.5, Trieste, 34149, Italy , Trieste (Italy)
  • 3 INFN, Via Enrico Fermi 54, Frascati, Italy , Frascati (Italy)
  • 4 Area della Ricerca di Tor Vergata, Via del Fosso del Cavaliere, Rome, Italy , Rome (Italy)
  • 5 Basovizza Area Science Park, Trieste, 34149, Italy , Trieste (Italy)
  • 6 University of Nova Gorica, Vipavska 11c, Ajdovščina, SI-5270, Slovenia , Ajdovščina (Slovenia)
  • 7 University of Science and Technology of China, Hefei, 230029, People’s Republic of China , Hefei (China)
  • 8 Elettra-Sincrotrone Trieste, Basovizza, I-34149, Italy , Basovizza (Italy)
  • 9 Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France , Gif-sur-Yvette Cedex (France)
  • 10 Institut des NanoSciences de Paris, Sorbonne Université, CNRS UMR 7588, 4 Place Jussieu, Paris, 75005, France , Paris (France)
  • 11 Rome International Centre for Material Science Superstripes, RICMASS, Via dei Sabelli 119A, Rome, 00185, Italy , Rome (Italy)
Published Article
Journal of Nanoparticle Research
Publication Date
Jan 30, 2021
DOI: 10.1007/s11051-020-05130-z
Springer Nature


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.

Report this publication


Seen <100 times