Publication detail

Self-organized TiO2 nanotubes grown on Ti substrates with different crystallographic preferential orientations: Local structure of TiO2 nanotubes vs. photo-electrochemical response

KRBAL, M. SOPHA, H. POHL, D. BENEŠ, L. DAMM, C. RELLINGHAUS, B. KUPČÍK, J. BEZDIČKA, P. ŠUBRT, J. MACÁK, J.

Original Title

Self-organized TiO2 nanotubes grown on Ti substrates with different crystallographic preferential orientations: Local structure of TiO2 nanotubes vs. photo-electrochemical response

Type

journal article in Web of Science

Language

English

Original Abstract

Here we report on structural properties and the photo-electrochemical response of annealed TiO2 nanotube layers, grown on four different Ti substrates by an identical anodization process. TiO2 nanotube layers were grown on Ti substrates by anodization in glycerol containing NH4F and water. The layers were then annealed at 400 C for 1 h in air. Photocurrent densities of annealed nanotubes were recorded upon irradiation with ultraviolet (UV) light at a constant potential of 0.4 V, in a 0.1M Na2SO4 aqueous solution. Approximately, a 280% difference in the photocurrent densities was recorded from TiO2 nanotubes fabricated from different Ti substrates. To elucidate the origin of this difference, the nanotube layers were scrutinized by Mott-Schottky measurements, X-ray diffraction (XRD) and Electron Energy Loss Spectroscopy (EELS). Inspection of the XRD patterns revealed preferential crystallographic orientations in various Ti substrates from which TiO2 nanotube layers were produced. Subsequent EELS analyses of the annealed nanotube layers disclosed significant differences in the Ti:O stoichiometry, in accordance with XRD evaluation of preferential orientation differences among used Ti substrates.

Keywords

TiO2 nanotubes Anodization Anatase Photo-current Stoichiometry

Authors

KRBAL, M.; SOPHA, H.; POHL, D.; BENEŠ, L.; DAMM, C.; RELLINGHAUS, B.; KUPČÍK, J.; BEZDIČKA, P.; ŠUBRT, J.; MACÁK, J.

Released

20. 2. 2018

ISBN

1873-3859

Periodical

ELECTROCHIMICA ACTA

Year of study

264

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

393

Pages to

399

Pages count

7

BibTex

@article{BUT146791,
  author="Miloš {Krbal} and Hanna Ingrid {Sopha} and Darius {Pohl} and Ludvík {Beneš} and Christine {Damm} and Bernd {Rellinghaus} and Jaroslav {Kupčík} and Petr {Bezdička} and Jan {Šubrt} and Jan {Macák}",
  title="Self-organized TiO2 nanotubes grown on Ti substrates with different crystallographic preferential orientations: Local structure of TiO2 nanotubes vs. photo-electrochemical response",
  journal="ELECTROCHIMICA ACTA",
  year="2018",
  volume="264",
  number="1",
  pages="393--399",
  doi="10.1016/j.electacta.2018.01.113",
  issn="1873-3859"
}