titania films
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Author(s):  
Sara Al-Waisawy ◽  
Ahmed Kareem Abdullah ◽  
Hadi A. Hamed ◽  
Ali A. Al-bakri

In this research, the pure titanium foil was treated in glycerol base electrolyte with 0.7 wt.% NH4F and a small amount of H2O at 17 V for 2 hours by electrochemical anodization process in order to prepare Titania nanotube arrays at room temperature (~25 ºC), different water content was added to the electrolyte as a tube enhancing agent. The high density uniform arrays are prepared by using organized and well aligned these tubes. The average size of tube diameter, ranging from 57 to 92 nm which found it increases with increasing water content, and the length of the tube ranging from 2.76 to 4.12 µm, also found to increase with increasing water content and ranging in size of wall thickness from 23 to 35 nm. A possible growth mechanism is presented. The X-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM) were utilized to study the structure and morphology of the Titania films.


Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 303
Author(s):  
Gunnar Símonarson ◽  
Antiope Lotsari ◽  
Anders E. C. Palmqvist

A low-temperature spray deposition synthesis was developed to prepare locally hexagonally ordered mesoporous titania films with polycrystalline anatase pore walls in an evaporation-induced self-assembly process. The titania film preparation procedure is conducted completely at temperatures below 50 °C. The effects of spray time, film thickness, synthesis time prior to spray deposition, and aging time at high relative humidity after deposition on the atomic arrangement and the mesoorder of the mesoporous titania were studied. We find the crystallite size to depend on both the synthesis time and aging time of the films, where longer times result in larger crystallites. Using the photocatalytic activity of titania, the structure-directing agent is removed with UV radiation at 43–46 °C. The capability of the prepared films to remove the polymer template increased with longer synthesis and aging times due to the increased crystallinity, which increases the photocatalytic efficiency of the titania films. However, with increasingly longer times, the crystallites grow too large for the mesoorder of the pores to be maintained. This work shows that a scalable spray coating method can be used to prepare locally ordered mesoporous polycrystalline titania films by judiciously tuning the synthesis parameters.


Author(s):  
D. Ihnatiuk ◽  
V. Vorobets ◽  
M. Šihor ◽  
C. Tossi ◽  
G. Kolbasov ◽  
...  

2021 ◽  
Author(s):  
Claire Armstrong ◽  
Louis-Vincent Delumeau ◽  
David Muñoz-Rojas ◽  
Ahmed Kursumovic ◽  
Judith MacManus-Driscoll ◽  
...  

Spatial atomic layer deposition retains the advantages of conventional atomic layer deposition: conformal, pinhole-free films and excellent control over thickness. Additionally, it allows higher deposition rates and is well-adapted to...


2021 ◽  
Vol 23 (5) ◽  
pp. 3219-3224
Author(s):  
Marvin Frisch ◽  
Joachim Laun ◽  
Julien Marquardt ◽  
Aleks Arinchtein ◽  
Katharina Bauerfeind ◽  
...  

Combined experimental & theoretical approach for the elucidation of structure–property relations in niobium-doped mesoporous titania.


2020 ◽  
Vol 7 (11) ◽  
pp. 115013
Author(s):  
Bangyun Xiong ◽  
Jingjing Li ◽  
Chunqing He ◽  
Xiuqin Tang ◽  
Zizhao Lv ◽  
...  

Author(s):  
О.P. Linnik ◽  
◽  
N.P. Smirnova ◽  
A.М. Eremenko ◽  
◽  
...  

According to the XPS investigation of titania films co-modified by nitro gen and metal ions obtained via sol-gel method, the formation of common bonds between elements occurs due to the presence of metal ions. The mechanism of urea thermolysis is changed as a result of the ability of metal ions to form the complex compounds with urea molecules under the reported synthesis conditions that, in turn, depends on the nature of metal ions, leading to the different chemical compositions of materials’ surface. The XPS data show that nitrogen atoms are surrounded by nonmetal ones on the surface of the films modi fied by Zn2+ or Zr4+ ions. It is suggested that no formation of the complexes between Ті, Zn, or Zr atoms with urea occurs due to its protonation through an oxygen atom leading to the formation of O,N-containing reaction products. In the case of Pt2+ doping, the substitutional nitrogen incorporation in the titania lattice, as well as the formation of N-containing fragments, have been detected. The chemical nature of Pt ions allows them to interact with urea molecules through an N atom of the amino group. As a result, the transformation of urea molecules in the complexes occurs at higher temperatures concurrently with the titania crystallization that is recognized as a catalyst for the intermediates of the urea decomposition leading to the formation of common bonds between N and Ti atoms.


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