Symmetry and models of single-walled TiO2 nanotubes with rectangular morphology

• Authors: Robert Evarestov , Yuri Zhukovskii , Andrei Bandura , Sergei Piskunov
• Languages of publication: EN

Abstracts

EN

The formalism of line symmetry groups for one-periodic (1D) nanostructures with rotohelical symmetry has been applied for symmetry analysis of single-walled titania nanotubes (SW TiO2 NTs) formed by rolling up the stoichiometric two-periodic (2D) slabs of anatase structure. Either six- or twelve-layer (101) slabs have been cut from TiO2 crystal in a stable anatase phase. After structural optimization, the latter keeps the centered rectangular symmetry of initial slab slightly compressed along a direction coincided with large sides of elemental rectangles. We have considered two sets of SW TiO2 NTs with optimized six- and twelve-layer structures, which possess chiralities (−n, n) and (n, n) of anatase nanotubes. To analyze the structural and electronic properties of titania slabs and nanotubes, we have performed their ab initio LCAO calculations, using the hybrid Hartree-Fock/Kohn-Sham exchange-correlation functional PBE0. The band gaps (Δɛ
gap) and strain energies (E
strain) of six-layer nanotubes have been computed and analyzed as functions of NT diameter (D
NT). As to models of 12-layer SW TiO2 NTs of both chiralities, their optimization results in structural exfoliation, i.e., the multi-walled structure should be rather formed in nanotubes with such a number of atomic layers.

Keywords

EN

line groups; rotohelical symmetry; TiO2 nanotubes; anatase structure; hybrid HF-DFT PBE0 calculations

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 2
• Pages: 492-501

Dates

published

1 - 4 - 2011

online

20 - 2 - 2011

Contributors

author

Robert Evarestov

• Department of Quantum Chemistry, St. Petersburg State University, 26 Universitetsky Avenue, Petrodvorets, 198504, Russia

author

Yuri Zhukovskii

• Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., Riga, LV-1063, Latvia

author

Andrei Bandura

• Department of Quantum Chemistry, St. Petersburg State University, 26 Universitetsky Avenue, Petrodvorets, 198504, Russia

author

Sergei Piskunov

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Identifiers

DOI

10.2478/s11534-010-0095-8