scholarly journals Effects of Annealing Temperature on the Crystal Structure, Morphology, and Optical Properties of Peroxo-Titanate Nanotubes Prepared by Peroxo-Titanium Complex Ion

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1331 ◽  
Author(s):  
Hyunsu Park ◽  
Tomoyo Goto ◽  
Sunghun Cho ◽  
Soo Wohn Lee ◽  
Masato Kakihana ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Precursor Solution ◽  
Titanate Nanotubes ◽  
Layered Compound ◽  
Alkali Concentration ◽  
Complex Ions ◽  
Nanotubular Structure ◽  
Structure Morphology ◽  
Hydrogen Titanate

This study addresses the effects of annealing temperatures (up to 500 °C) on the crystal structure, morphology, and optical properties of peroxo groups (–O–O–) containing titanate nanotubes (PTNTs). PTNTs, which possess a unique tubular morphology of layered-compound-like hydrogen titanate structure (approximately 10 nm in diameter), were synthesized using peroxo-titanium (Ti–O–O) complex ions as a precursor under very mild conditions—temperature of 100 °C and alkali concentration of 1.5 M—in the precursor solution. The nanotubular structure was dismantled by annealing and a nanoplate-like structure within the range of 20–50 nm in width and 100–300 nm in length was formed at 500 °C via a nanosheet structure by decreasing the specific surface area. Hydrogen titanate-based structures of the as-synthesized PTNTs transformed directly into anatase-type TiO2 at a temperature above 360 °C due to dehydration and phase transition. The final product, anatase-based titania nanoplate, was partially hydrogen titanate crystal in nature, in which hydroxyl (–OH) bonds exist in their interlayers. Therefore, the use of Ti–O–O complex ions contributes to the improved thermal stability of hydrogen titanate nanotubes. These results show a simple and environmentally friendly method that is useful for the synthesis of functional nanomaterials for applications in various fields.

Control of crystal structure, morphology and optical properties of ceria films by post deposition annealing treatments

2016 ◽  
Vol 603 ◽  
pp. 363-370 ◽  
Author(s):  
Asmaa Eltayeb ◽  
Rajani K. Vijayaraghavan ◽  
Anthony P. McCoy ◽  
Joseph Cullen ◽  
Stephen Daniels ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Post Deposition Annealing ◽  
Structure Morphology ◽  
Post Deposition

Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51342-51348 ◽  
Author(s):  
Inderpreet Singh Grover ◽  
Satnam Singh ◽  
Bonamali Pal
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Thermal Treatment ◽  
Sodium Titanate ◽  
Titanate Nanotubes ◽  
Crystal Phase ◽  
Notable Change ◽  
Structure Morphology ◽  
Titanate Nanostructures

A coalescence influence of Au-loading followed by calcination at 800 °C led to a notable change in crystal-structure, morphology, phase composition and photocatalytic activity of titanate-nanostructures.

scholarly journals Photocatalytic Degradation of Methylene Blue over TiO2 Pretreated with Varying Concentrations of NaOH

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 575 ◽  
Author(s):  
Chentao Hou ◽  
Bo Hu ◽  
Jiaming Zhu
Keyword(s):  
Crystal Structure ◽  
Methylene Blue ◽  
Optical Properties ◽  
Specific Surface ◽  
Photocatalytic Degradation ◽  
Recombination Rate ◽  
Radical Scavenging ◽  
Structure Morphology ◽  
Hole Recombination ◽  
Morphology Changes

In this paper, different NaOH concentrations (2, 5, 10, and 15 M) were used to treat {001}TiO2. The effect of NaOH on the crystal structure, morphology, optical properties, light raw electronic-hole recombination, and degradation performance of {001}TiO2 on methylene blue were studied. The results demonstrate that rutile TiO2 appeared when the NaOH concentration was as high as 10 M, showing much better photolytic performance than others. As the concentration of sodium hydroxide increases, the morphology changes accordingly. The specific surface area increases and the optical electronic-hole recombination rate decreases. Radical scavenging tests showed that hydroxyl radical and hole are very important in photocatalysis.

scholarly journals Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers

RSC Advances ◽  
2021 ◽  
Vol 11 (51) ◽  
pp. 32358-32368
Author(s):  
Zorka Ž. Vasiljević ◽  
Milena P. Dojčinović ◽  
Jelena D. Vujančević ◽  
Matjaž Spreitzer ◽  
Janez Kovač ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Metal Oxide ◽  
Environmental Applications ◽  
Mixed Metal Oxide ◽  
Oxide Material ◽  
Mixed Metal ◽  
Structure Morphology ◽  
The Impact

Nanostructured Fe2TiO5 (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications.

Structural/Property Relationships for Optical Materials

1993 ◽  
Vol 329 ◽  
Author(s):  
Vivien D.
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Electronic Structure ◽  
Chemical Composition ◽  
Field Strength ◽  
Optical Materials ◽  
Site Occupancy ◽  
Laser Materials ◽  
Crystal Field Strength ◽  
The Matrix

AbstractIn this paper the relationships between the crystal structure, chemical composition and electronic structure of laser materials, and their optical properties are discussed. A brief description is given of the different laser activators and of the influence of the matrix on laser characteristics in terms of crystal field strength, symmetry, covalency and phonon frequencies. The last part of the paper lays emphasis on the means to optimize the matrix-activator properties such as control of the oxidation state and site occupancy of the activator and influence of its concentration.

Effect of Mn3+ doping on crystal structure, point defects, and optical properties in green Ca3(VO4)2 single crystals

2021 ◽  
pp. 111300
Author(s):  
Galina M. Kuz’micheva ◽  
Liudmila. I. Ivleva ◽  
Irina A. Kaurova ◽  
Evgeny V. Khramov ◽  
Victor B. Rybakov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Single Crystals ◽  
Point Defects

scholarly journals Study on the Electrical, Structural, Chemical and Optical Properties of PVD Ta(N) Films Deposited with Different N2 Flow Rates

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 937
Author(s):  
Yingying Hu ◽  
Md Rasadujjaman ◽  
Yanrong Wang ◽  
Jing Zhang ◽  
Jiang Yan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Crystal Size ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
Flow Rates ◽  
X Ray ◽  
N2 Flow Rate

By reactive DC magnetron sputtering from a pure Ta target onto silicon substrates, Ta(N) films were prepared with different N2 flow rates of 0, 12, 17, 25, 38, and 58 sccm. The effects of N2 flow rate on the electrical properties, crystal structure, elemental composition, and optical properties of Ta(N) were studied. These properties were characterized by the four-probe method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE). Results show that the deposition rate decreases with an increase of N2 flows. Furthermore, as resistivity increases, the crystal size decreases, the crystal structure transitions from β-Ta to TaN(111), and finally becomes the N-rich phase Ta3N5(130, 040). Studying the optical properties, it is found that there are differences in the refractive index (n) and extinction coefficient (k) of Ta(N) with different thicknesses and different N2 flow rates, depending on the crystal size and crystal phase structure.

scholarly journals Author Correction: Crystal structure and optical properties of a high-density InGaN nanoumbrella array as a white light source without phosphors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tetsuya Kouno ◽  
Masaru Sakai ◽  
Katsumi Kishino ◽  
Akihiko Kikuchi ◽  
Naoki Umehara ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Light Source ◽  
White Light ◽  
High Density ◽  
White Light Source

A Correction to this paper has been published: https://doi.org/10.1038/s41427-021-00298-9

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