scholarly journals Оптические и структурные свойства нанопленок палладия в атмосфере водорода

2021 ◽  
Vol 129 (9) ◽  
pp. 1183
Author(s):  
В.А. Шутаев ◽  
В.А. Матвеев ◽  
Е.А. Гребенщикова ◽  
В.Г. Щелоков ◽  
Ю.П. Яковлев
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Crystallite Size ◽  
Average Crystallite Size ◽  
Hydrogen Sensor ◽  
Optical Transparency ◽  
Radiation Wavelength ◽  
Practical Application ◽  
Thermal Vacuum

The crystal structure and optical properties of thermal-vacuum deposited palladium nanolayers at the thickness range of 10-130 nm was studied. It was found that Pd nanolayers are polycrystalline and the value of an average crystallite size depends on the layer thickness. The optical transparency of Pd nanolayers was investigated on the radiation wavelength about 0.95 μm in air and in hydrogen medium (100 vol.%). It was experimentally found that both in air and in hydrogen medium the optical transparency of Pd nanolayers in the thickness range of 10-45 nm obeys the Bouger law. The thickness range of Pd thin films suitable for practical application in hydrogen sensor was determined.

scholarly journals Characterization of Cobalt Sulfide Thin Films Synthesized from Acidic Chemical Baths

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Tizazu Abza ◽  
Dereje Gelanu Dadi ◽  
Fekadu Gashaw Hone ◽  
Tesfaye Chebelew Meharu ◽  
Gebremeskel Tekle ◽  
...  
Keyword(s):  
Thin Films ◽  
Crystallite Size ◽  
Deposition Time ◽  
Average Crystallite Size ◽  
Cobalt Sulfide ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Face Centered

Cobalt sulfide thin films were synthesized from acidic chemical baths by varying the deposition time. The powder X-ray diffraction studies indicated that there are hexagonal CoS, face-centered cubic Co3S4, and cubic Co9S8 phases of cobalt sulfide. The crystallite size of the hexagonal CoS phase decreased from 52.8 nm to 22.5 nm and that of the cubic Co9S8 phase increased from 11 nm to 60 nm as the deposition time increased from 2 hrs to 3.5 hrs. The scanning electron microscopic images revealed crack and pinhole free thin films with uniform and smooth background and few large polygonal grains on the surface. The band gap of the cobalt sulfide thin films decreased from 1.75 eV to 1.3 eV as the deposition time increased from 2 hrs to 3.5 hrs. The photoluminescence (PL) spectra of the films confirmed the emission of ultraviolet, violet, and blue lights. The intense PL emission of violet light at 384 nm had red shifted with increasing deposition time that could be resulted from the increase in the average crystallite size. The FTIR spectra of the films indicated the presence of OH, C-O-H, C-O, double sulfide, and Co-S groups. As the deposition time increased, the electrical resistivity of the cobalt sulfide thin films decreased due to the increase in both the crystallite size and the films’ thickness.

Optical properties and crystal structure of lithium doped Ba0.55Sr0.45TiO3(BLST) thin films

2018 ◽  
Vol 45 (1-3) ◽  
pp. 14-21 ◽  
Author(s):  
Irzaman ◽  
A. Nuraisah ◽  
Aminullah ◽  
K. A. Hamam ◽  
H. Alatas
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties

Crystal Structure and Optical Properties of Al-Doped ZnO Large-Area Thin Films Using 1500 mm Dual Cylindrical Cathodes

2015 ◽  
Vol 15 (11) ◽  
pp. 8370-8374
Author(s):  
JinJu Lee ◽  
Jong-Yoon Ha ◽  
Haena Yim ◽  
Won-Kook Choi ◽  
Ji-Won Choi
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Large Area ◽  
Doped Zno

scholarly journals Influence of zinc ion concentration on structure, morphology and optical properties of spray deposited ZnO thin films

2021 ◽  
Vol 10 (3) ◽  
pp. 198
Author(s):  
Sarika Vishvnbath Jadhav ◽  
Limbraj Sopan Ravangave
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Crystallite Size ◽  
Zinc Acetate ◽  
Zinc Ion ◽  
Ion Concentration ◽  
Zno Thin Films ◽  
Electromagnetic Spectrum ◽  
Structure Morphology ◽  
Wide Range

<p>Zinc Oxide (ZnO) thin films were deposited for five different molarity (M) of Zinc acetate hydrated (0.075, 0.1, 0.125, 0.15, 0.175 M) using simple spray technique to study the effect of zinc ion concentration on structure, morphology and optical properties. The XRD patterns of deposited ZnO thin films show hexagonal crystal structure with wurtzite symmetry. The effect of molarity on morphology was studied using scanning electron microscopy (SEM). The elemental analysis was studied by using energy dispersive X-ray analysis (EDX). The optical absorption was recorded by using systronics double beam spectrophotometer (2201). Crystallite size estimated from XRD data was in nanometre (nm) range; however, films deposited for 0.15 M zinc acetate show maximum crystallite size (66 nm) as compared to other samples. All the films show low absorption in wide range (340-999 nm) of electromagnetic spectrum. However, ZnO film deposited for 0.15 zinc acetate hydrated shows maximum blue shifting of absorption edge and higher band gap (3.8 eV) as compared to other samples.</p>

scholarly journals Effect of Co Doping on Structural and Optical Properties of NiO Thin Films Prepared by Chemical Spray Pyrolysis Method

2014 ◽  
Vol 41 ◽  
pp. 15-30 ◽  
Author(s):  
Nabeel A. Bakr ◽  
Sabah A. Salman ◽  
Ahmed M. Shano
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Crystallite Size ◽  
Cobalt Oxide ◽  
Chemical Spray Pyrolysis ◽  
Structural And Optical Properties ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide ◽  
Chemical Spray ◽  
Co Concentration

In this work, nickel-cobalt oxide (Ni(1-x)CoxO) thin films, where x = 0, 4, 6 and 8 % have been successfully deposited on glass substrates by chemical spray pyrolysis (CSP) technique at substrate temperature of (400 °C) and thickness of about 300 nm. The structural and optical properties of these films have been studied using XRD, AFM, and UV-Visible spectroscopy. The XRD results showed that all films are polycrystalline in nature with cubic structure and preferred orientation along (111) plane. The crystallite size was calculated using Scherrer formula and it is found that the undoped NiO sample has maximum crystallite size (51.16 nm). AFM results showed homogenous and smooth thin films. The absorbance and transmittance spectra have been recorded in the wavelength range of (300-900) nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc equation. It is found that the band gap decreases as the Co-concentration increases and the band gap values were in the range of 3.58-3.66 eV and 3.58 eV for the prepared Nickel-Cobalt Oxide thin films. The Urbach energy increases as the Co-concentration increases and the Urbach. The optical constants including (absorption coefficient, real and imaginary parts of dielectric constant) were also calculated as a function of photon energy. Refractive index and extinction coefficient for Nickel-Cobalt Oxide thin films were estimated as a function of wavelength.

Effect of crystal structure on optical properties of sol–gel derived zirconia thin films

2013 ◽  
Vol 556 ◽  
pp. 182-187 ◽  
Author(s):  
Xiaodong Wang ◽  
Guangming Wu ◽  
Bin Zhou ◽  
Jun Shen
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Sol Gel

Effect of Praseodymium Species on the Structural and Functional Properties of Nanocrystalline BiFeO3 Powders and Thin Films

2012 ◽  
Vol 1454 ◽  
pp. 39-44
Author(s):  
Gina Montes Albino ◽  
Marco Gálvez-Saldaña ◽  
Oscar Perales-Pérez
Keyword(s):  
Thin Films ◽  
Crystallite Size ◽  
Functional Properties ◽  
Doping Level ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ferroelectric Behavior ◽  
Structural And Functional Properties

ABSTRACTThe present study addressed the effect of the incorporation of Praseodymium species in the BiFeO3(BFO) structure on the corresponding structural and functional properties of powders and films. The level of the doping species varied from 0 at% to 4 at%. BFO powders and thin films were synthesized by a sol-gel method, where glycol was aggregated to the main solvent to increase the viscosity of the precursor solutions and promote their adhesion onto platinum substrates. The development of the host BFO structure was confirmed by XRD analyses of samples annealed at 700°C for one hour (powders) or 500°C for 2 hours (thin films), in air. The average crystallite size varied from 37 nm to 41 nm and 28nm to 40nm for powders and thin films, respectively, due to the increase of the doping level. The incorporation of specific dopant species played an important role in the ferromagnetic and ferroelectric behavior in the material.

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