Atomic Layer Deposition of Mixed-Layered Aurivillius Phase on TiO<sub>2</sub> Nanotubes: Synthesis, Characterization and Photoelectrocatalytic Properties
Farid Orudzhev,
Shikhgasan Ramazanov,
Dinara Sobola,
Abdulgalim Isaev,
Chuanyi Wang,
Asiyat Magomedova,
Makhmud Kadiev,
Kasinathan Kaviyarasu
Affiliations
Farid Orudzhev
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Shikhgasan Ramazanov
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Dinara Sobola
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Abdulgalim Isaev
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Chuanyi Wang
School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Asiyat Magomedova
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Makhmud Kadiev
Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, st. M. Gadjieva 43-a, Dagestan Republic, 367015 Makhachkala, Russia
Kasinathan Kaviyarasu
UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria 0003, South Africa
For the first time, one-dimensional phase-modulated structures consisting of two different layered Aurivillius phases with alternating five and six perovskite-like layers were obtained by atomic layer deposition (ALD) on the surface of TiO2 nanotubes (Nt). It was shown that the use of vertically oriented TiO2 Nt as the substrate and the ALD technology of a two-layer Bi2O3-FeOx sandwich-structure make it possible to obtain a layered structure due to self-organization during annealing. A detailed study by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the coating is conformal. Raman spectroscopic analysis indicated the structure of the layered Aurivillius phases. Transient photocurrent responses under Ultraviolet–Visible (UV-Vis) light irradiation show that the ALD coating benefits the efficiency of photon excitation of electrons. The results of the photoelectrocatalytic experiments (PEC) with methyl orange degradation as a model demonstrate the significant potential of the synthesized structure as a photocatalyst. Photoluminescent measurement showed a decrease in the probability of recombination of photogenerated electron–hole pairs for ALD-coated TiO2 Nt, which demonstrates the high potential of these structures for use in photocatalytic and photoelectrochemical applications.
