Investigating oxidation of niobium by laser treatment

2019 ◽  
pp. 61-69
Author(s):  
O. S. Yulmetova
Keyword(s):  
Optical Properties ◽  
Infrared Spectrum ◽  
Oxide Film ◽  
Laser Treatment ◽  
Laser Processing ◽  
Reflection Coefficients ◽  
Optical Contrast ◽  
Blue Shade ◽  
Second Mode ◽  
Composition Structure

Composition, structure, and optical properties of films formed on the surface of niobium during laser processing are presented. Two modes of laser oxidation of niobium are empirically determined. The first mode, using single-pass laser processing, create the blue shade oxide film, the second mode, using multipass laser processing, forms the green shade oxide film. The optical contrast, determined as a difference of reflection coefficients, in the infrared spectrum of the blue oxide film is equal to 0.2 and the green oxide film forms the contrast equal to 0.5. It was found that the niobium blue shade oxide films, obtained after laser processing, has stoichiometry NbO and the green oxide film has stoichiometryNbO2.

Optical Properties of Nano-Structure Tungsten-Doped Vanadium Oxide

2012 ◽  
Author(s):  
W. B. Cai ◽  
F. Wang ◽  
Y. P. Miao ◽  
J. Wei ◽  
K. L. Zhang
Keyword(s):  
Optical Properties ◽  
Transition Temperature ◽  
Oxide Film ◽  
Vanadium Oxide ◽  
High Vacuum ◽  
Infrared Transmission ◽  
Dc Magnetron Sputtering ◽  
Nano Structure ◽  
Before And After ◽  
Deposited Film

Tungsten-doped vanadium oxide has been proved to decrease the transition temperature, which enables vanadium oxide film to be more promising. Besides, the nano-structure can improve the properties of the film when compared with the as-deposited film. In this letter, a nano-structure tungsten-doped vanadium oxide film is proposed. Tungsten-doped vanadium oxide film was deposited on the Si (400) substrate by DC magnetron sputtering. The doping level was controlled by adjusting the sputtering time. Then the as-deposited film was annealed to form a nano-structure film at the temperature of 500 °C for 1 h in high vacuum. The morphology and crystalline structure of such films were characterized by AFM and XRD, respectively. Optical properties of the films were tested by FTIR, mainly comparing the infrared transmission before and after annealing.

On the effects of thermal treatment on the composition, structure, morphology, and optical properties of hydrogenated amorphous silicon-oxycarbide

2009 ◽  
Vol 24 (8) ◽  
pp. 2561-2573 ◽  
Author(s):  
Spyros Gallis ◽  
Vasileios Nikas ◽  
Eric Eisenbraun ◽  
Mengbing Huang ◽  
Alain E. Kaloyeros
Keyword(s):  
Optical Properties ◽  
Thermal Treatment ◽  
Amorphous Silicon ◽  
Hydrogenated Amorphous Silicon ◽  
Effective Cross Section ◽  
Silicon Oxycarbide ◽  
Nuclear Reaction Analysis ◽  
Structure Morphology ◽  
Composition Structure ◽  
Hydrogenated Amorphous

The composition, structure, morphology, and optical characteristics of hydrogenated amorphous silicon-oxycarbide (a-SiCxOyHz) materials were investigated as a function of experimental processing conditions and post-deposition thermal treatment. Thermal chemical vapor deposition (TCVD) was applied to the growth of three different types of a-SiCxOyHz films, namely, SiC-like (SiC1.08O0.07H0.21), Si-C-O (SiC0.50O1.20H0.22), and SiO2-like (SiC0.20O1.70H0.24). The resulting films were subsequently annealed at temperatures ranging from 500 °C to 1100 °C for 1 h in an argon atmosphere. The composition, structure, and morphology of as-deposited and post-annealed films were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectroscopy (RBS), nuclear-reaction analysis (NRA), and scanning electron microscopy. Corresponding optical properties were assessed by spectroscopic ultraviolet-visible ellipsometry (UV-VIS-SE). These studies led to the identification of an optimized process window for the growth of Er doped silicon oxycarbide (SiC0.5O1.0:Er) thin film with strong room-temperature photoluminescence emission measured around 1540 nm within a broad (460 nm to 600 nm) wavelength band. Associated modeling studies showed that the effective cross section for Er excitation in the SiC0.5O1.0:Er matrix was approximately four orders of magnitude larger than its analog for direct optical excitation of Er ions.

Laser Modification of Leather and Fur Surface to Improve Its Quality when Conducting Finishing Operations

2020 ◽  
Vol 20 (4) ◽  
pp. 353-360
Author(s):  
Akmal Yusupovich TOSHEV ◽  
Mariya Ivanovna MARKEVICH ◽  
Tulkin Jumayevich KODIROV ◽  
Valentina Illarionovna ZHURAVLEVA
Keyword(s):  
Chemical Modification ◽  
Laser Treatment ◽  
Laser Processing ◽  
Collagen Fibers ◽  
Laser Exposure ◽  
Laser Modification ◽  
Treatment Changes ◽  
Configuration Changes

The article discusses the problems of activation of the surface of the leather tissue by laser exposure, changes in the morphology of the surface of the leather tissue during laser processing, and subsequent covering dyeing of the leather. It is shown that laser treatment changes the structure of the surface of the leather tissue, the bundles of collagen fibers are split, the structure becomes loose, which increases the diffusion of the coating dye reagents, and their reactivity increases without chemical modification. In the process of grinding leather fabric, it is finely cleaned which improves adhesion of the coating paint to the surface of the leather fabric, which improves the quality of leather fabric products. It was shown that laser exposure under the conditions found (pulses with an interval of 3 μs, a duration of 10 ns) does not cause destruction and configuration changes in collagen.

Optical properties of water under the action of the electromagnetic field in the infrared spectrum

2020 ◽  
Vol 30 ◽  
pp. 1046-1051
Author(s):  
R. Mghaiouini ◽  
N. Benzbiria ◽  
M.E. Belghiti ◽  
H.E. Belghiti ◽  
M. Monkade ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Optical Properties ◽  
Infrared Spectrum

scholarly journals Composition, structure and hardness of titanium after pulse laser processing in graphite

2019 ◽  
Vol 1410 ◽  
pp. 012220
Author(s):  
V Koshuro ◽  
A Voyko ◽  
M Fomina ◽  
V Papshev ◽  
A Antropov
Keyword(s):  
Pulse Laser ◽  
Laser Processing ◽  
Composition Structure

Design of composition, structure and optical properties of AsxSe100-x (15

2019 ◽  
Vol 94 ◽  
pp. 166-171 ◽  
Author(s):  
Aleksey Nezdanov ◽  
Dmitry Usanov ◽  
Mikhail Kudryashov ◽  
Aleksey Markelov ◽  
Vladimir Trushin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Composition Structure

scholarly journals Polyvinylpyrrolidone Nanofibers Encapsulating an Anhydrous Preparation of Fluorescent SiO2–Tb3+ Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 510 ◽  
Author(s):  
Jianhang Shi ◽  
Yanxin Wang ◽  
Linjun Huang ◽  
Peng Lu ◽  
Qiuyu Sun ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Hybrid Nanoparticles ◽  
Hybrid Nanofibers ◽  
Transmission Electron ◽  
Potential Applications ◽  
Composition Structure ◽  
Photoluminescent Materials ◽  
Influence Of Ph

A novel anhydrous preparation of silica (SiO2)-encapsulated terbium (Tb3+) complex nanoparticles has been investigated. The SiO2-Tb3+ nanoparticles are incorporated in electrospun polyvinylpyrrolidone hybrid nanofibers. Transmission electron microscopy confirms that Tb3+ complexes are uniformly and stably encapsulated in or carried by nanosilica. The influence of pH on the fluorescence of Tb3+ complexes is discussed. The properties, composition, structure, and luminescence of the resulting SiO2–Tb3+ hybrid nanoparticles are investigated in detail. There is an increase in the fluorescence lifetime of SiO2–Tb3+ nanoparticles and SiO2–Tb3+/polyvinylpyrrolidone (PVP) hybrid nanofibers compared with the pure Tb3+ complexes. Due to the enhanced optical properties, the fluorescent hybrid nanofibers have potential applications as photonic and photoluminescent materials.

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