Evolution of nanostructures of anatase TiO2 thin films grown on (001) LaAlO3

Regina Ciancio, Andrea Vittadini, Annabella Selloni, Riccardo Arpaia, Carmela Aruta, Fabio Miletto Granozio, Umberto Scotti Di Uccio, Giorgio Rossi, Elvio Carlino

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Abstract

Combining reflection high-energy electron diffraction, high-resolution transmission electron microscopy, and high-angle annular dark field scanning transmission electron microscopy we unveil the existence of a peculiar transition from a three-dimensional to a two-dimensional growth mode in anatase TiO2/LaAlO3 heterostructures. Such a growth dynamics is accompanied by Al interdiffusion from substrate to the growing film up to a critical thickness of 20 nm. With the extra support of ab initio calculations, we show that the crossover between the two growth modes corresponds to the formation of two distinct regions characterized by (103)- and (101)-oriented crystallographic shear superstructures, occurring in the upmost film region and in proximity of the film/substrate interface, respectively.

Original languageEnglish (US)
Article number1735
JournalJournal of Nanoparticle Research
Volume15
Issue number6
DOIs
StatePublished - Jun 5 2013

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Composition
  • Defects and impurities
  • Density functional theory
  • Gradient and other corrections
  • High-resolution transmission electron microscopy
  • Local density approximation
  • Segregation
  • Thin-film structure and morphology

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  • Cite this

    Ciancio, R., Vittadini, A., Selloni, A., Arpaia, R., Aruta, C., Miletto Granozio, F., Scotti Di Uccio, U., Rossi, G., & Carlino, E. (2013). Evolution of nanostructures of anatase TiO2 thin films grown on (001) LaAlO3. Journal of Nanoparticle Research, 15(6), [1735]. https://doi.org/10.1007/s11051-013-1735-x