The influence of the mixed phase (Ti-TiO<SUB>2</SUB>(A): TiO<SUB>2</SUB>(R)) on the optical band gap of TiO<SUB>2</SUB> nanotubes heat treated at different temperatures - INSU - Institut national des sciences de l'Univers
Article Dans Une Revue Journal of Materials Research Année : 2023

The influence of the mixed phase (Ti-TiO2(A): TiO2(R)) on the optical band gap of TiO2 nanotubes heat treated at different temperatures

D. Zalouk
  • Fonction : Auteur
D. Hatem
  • Fonction : Auteur
D. Hocine
  • Fonction : Auteur
M. S. Belkaid
  • Fonction : Auteur
T. Hadjersi
  • Fonction : Auteur
S. Boudinar
  • Fonction : Auteur

Résumé

Highly ordered TiO2 nanotubes (NTs) were synthesized by electrochemical anodization than annealed at different temperatures between 300 and 900 °C for 3 h. The elaborated NTs adhere well to the Ti substrate over the annealing temperature range of 300-600 °C. The TiO2 NTs morphology begins to gradually evolve for temperatures up to 700 °C and approaches that of nanoparticles until the latter become predominant at T above 800 °C. Reflection measurements show that the NTs present reflection of 7% at 600 °C, corresponding to the lowest band gap 2.59 eV. This can be related to the presence of the mixed phase (Ti-TiO2(A)-TiO2(R)).The charge carrier density decreases from 2.34 × 10+21 to 3.61 × 10+13 cm−3when the annealing temperature increases, that accompanied by a reduction in the resistivity from 142.23 to 29.56Ω.cm which is adequate to photo anode application.
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Dates et versions

insu-04181156 , version 1 (15-08-2023)

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Citer

D. Zalouk, D. Hatem, D. Hocine, M. S. Belkaid, T. Hadjersi, et al.. The influence of the mixed phase (Ti-TiO2(A): TiO2(R)) on the optical band gap of TiO2 nanotubes heat treated at different temperatures. Journal of Materials Research, 2023, 38, pp.3446-3457. ⟨10.1557/s43578-023-01027-4⟩. ⟨insu-04181156⟩
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