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2011 | 9 | 2 | 492-501
Tytuł artykułu

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

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
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.
Wydawca
Czasopismo
Rocznik
Tom
9
Numer
2
Strony
492-501
Opis fizyczny
Daty
wydano
2011-04-01
online
2011-02-20
Twórcy
  • Department of Quantum Chemistry, St. Petersburg State University, 26 Universitetsky Avenue, Petrodvorets, 198504, Russia , re1973@re1973.spb.edu
  • Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., Riga, LV-1063, Latvia
  • Department of Quantum Chemistry, St. Petersburg State University, 26 Universitetsky Avenue, Petrodvorets, 198504, Russia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-010-0095-8
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