scholarly journals Fabrication and characterization of Si/SiO2/TiO2/ZnO heterostructures from sputtered and oxidized Ti-film

2017 ◽  
Vol 68 (7) ◽  
pp. 58-61
Author(s):  
Jaroslav Kováč ◽  
Martin Florovič ◽  
Andrej Vincze ◽  
Edmund Dobročka ◽  
Ivan Novotný ◽  
...  
Keyword(s):  
Rf Sputtering ◽  
Depth Profiling ◽  
Si Substrate ◽  
Electrical And Optical Properties ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Fabrication And Characterization ◽  
Sims Depth Profiling ◽  
Structure Properties

AbstractThe present work reports the fabrication of p-Si/SiO2/TiO2and p-Si/SiO2/TiO2/ZnO heterostructures deposited by RF sputtering on p-Si substrate. The structural properties of the heterostructures were characterized by X-ray reflectivity and SIMS depth profiling. The electrical and optical properties of the heterostructures were investigated byI − V, C-V measurements and VIS spectroscopy, respectively. The measurements reveal thatI − Vcharacteristics in dark show semiconductor-insulator-semiconductor (SIS) structure properties. TheI − Vcharacteristics under illumination exhibit changes with significant increase of photocurrent due to photoassisted tunnelling and injection through SiO2/TiO2interlayer.

Physical Characterization of Thin Films of Lithium Niobate Deposited on Silicon Substrates

1990 ◽  
Vol 200 ◽  
Author(s):  
Robert C. Baumann ◽  
Timothy A. Rost ◽  
Thomas A. Rabson
Keyword(s):  
Thin Films ◽  
Rf Sputtering ◽  
Depth Profiling ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Optical ◽  
Auger Electron Spectroscopy Depth ◽  
Deposition Conditions

ABSTRACTThin films (.1-.6 μm) of LiNbO3 have been deposited on silicon substrates by reactive rf sputtering. Under optimized deposition conditions the resulting thin films of LiNbO3 were optically transparent, adhered well to the silicon substrates, and were found to be polycrystalline and uniaxial with the c axis oriented normal to the silicon surface. Optical microscopy and scanning electron microscopy were used to examine film morphology. Both methods indicated that the films were smooth and contained no gross irregularities. The ratio of oxygen to niobium in these films was measured by Rutherford backscattering to be approximately 3 to 1. Auger electron spectroscopy depth profiling revealed that the films had the expected ratio of Li, Nb, and O. This information, together with Bragg x-ray diffraction data, indicates that the thin films deposited on silicon were stoichiometric, crystalline LiNbO3.

scholarly journals Structural and Band Structure Investigation of Iron Oxide Nanoparticles Incorporated PVA Nanocomposite Films

2021 ◽  
Author(s):  
Muhammad Aslam ◽  
Muhammad Basit ◽  
Muhammad Ahmad ◽  
Zulfiqar Ali Raza
Keyword(s):  
Iron Oxide ◽  
Analytical Techniques ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Band Tail ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Uv Visible ◽  
Fabrication And Characterization

Abstract The work reported here deals with the fabrication and characterization of iron oxide (Fe3O4) nanoparticles (NPs – IONPs) incorporated polyvinyl alcohol (PVA)-based nanocomposite films. The nanocomposite films, fabricated via solution casting route, have been characterized using advanced analytical techniques including x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and UV-visible (vis.) spectroscopy. There observed notable changes in the structural phases, crystallite size (2.3 to 2.1 nm), d-spacing (0.131 to 0.134 Å), optical absorption edge (5.12 to 4.84 eV), indirect bandgap (4.99 to 4.68 eV), direct bandgap (5.35 to 5.20 eV), and band tail (0.57 to 0.89 eV) from native PVA to nanocomposite films. The refractive index and optical conductivity enhancements were also observed on incorporating IONPs into the PVA matrix. It could be inferred that a minute loading of IONPs might induce significant alternation in opto-structural properties of the PVA-based nanocomposites for potential optoelectronic applications.

scholarly journals Synthesis and characterization of Fe, Co, and Ni colloids in 2-mercaptoethanol

2020 ◽  
Vol 10 ◽  
pp. 184798042096688
Author(s):  
Galo Cárdenas-Triviño ◽  
Sergio Triviño-Matus
Keyword(s):  
Electron Microscopy ◽  
Electron Diffraction ◽  
Colloidal Dispersions ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Chemical Liquid Deposition ◽  
Liquid Deposition

Metal colloids in 2-mercaptoethanol using nanoparticles (NPs) of iron (Fe), cobalt (Co), and nickel (Ni) were prepared by chemical liquid deposition method. Transmission electron microscopy, electron diffraction, UV-VIS spectroscopy, and scanning electron microscopy with electron dispersive X-ray spectroscopy characterized the resulting colloidal dispersions. The NPs exhibited sizes with ranges from 9.8 nm for Fe, 3.7 nm for Co, and 7.2 nm for Ni. The electron diffraction shows the presence of the metals in its elemental state Fe (0), Co (0), and Ni (0) and also some compounds FeO (OH), CoCo2S4, and NiNi2S4.

scholarly journals Fabrication and characterization of Si-based soft x-ray mirrors

1991 ◽  
Author(s):  
Bernt Schmiedeskamp ◽  
Bernhard Heidemann ◽  
Ulf Kleineberg ◽  
Andreas Kloidt ◽  
Mikhael Kuehne ◽  
...  
Keyword(s):  
X Ray ◽  
Fabrication And Characterization

scholarly journals Fabrication and Characterization of Al/NiO Energetic Nanomultilayers

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
YiChao Yan ◽  
Wei Shi ◽  
HongChuan Jiang ◽  
Jie Xiong ◽  
WanLi Zhang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Total Thickness ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
Metallic Oxide ◽  
Promising Candidate ◽  
X Ray ◽  
Thermal Boundary Conductance ◽  
Fabrication And Characterization

The redox reaction between Al and metallic oxide has its advantage compared with intermetallic reaction and Al/NiO nanomutlilayers are a promising candidate for enhancing the performance of energetic igniter. Al/NiO nanomutlilayers with different modulation periods are prepared on alumina substrate by direct current (DC) magnetron sputtering. The thicknesses of each period are 250 nm, 500 nm, 750 nm, 1000 nm, and 1500 nm, respectively, and the total thickness is 3 μm. The X-ray diffraction (XRD) and scanning electron microscope (SEM) results of the as-deposited Al/NiO nanomutlilayers show that the NiO films are amorphous and the layered structures are clearly distinguished. The X-ray photoelectron spectroscopy (XPS) demonstrates that the thickness of Al2O3increases on the side of Al monolayer after annealing at 450°C. The thermal diffusion time becomes greater significantly as the amount of thermal boundary conductance across the interfaces increases with relatively smaller modulation period. Differential scanning calorimeter (DSC) curve suggests that the energy release per unit mass is below the theoretical heat of the reaction due to the nonstoichiometric ratio between Al and NiO and the presence of impurities.

scholarly journals Preparation and Characterization of Porous Ceramic Membranes for Micro-Filtration from Clay/CuZn Using Extrusion Methods

2018 ◽  
Vol 156 ◽  
pp. 08015 ◽  
Author(s):  
Muh Amin ◽  
Muhammad Subri
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
Ceramic Membranes ◽  
Extrusion Process ◽  
X Ray Diffraction ◽  
Percentage Composition ◽  
X Ray ◽  
Ceramic Support ◽  
Fabrication And Characterization

In this study, fabrication and characterization of ceramic membranes preparation was carried out. Porous ceramic membranes were fabricated by extrusion process from different percentage composition of CuZn on (80 wt% Clay, 10 wt% TiO2, 5 wt% Carbon and 5 wt% PVA). The fabricated membranes were sintered at 900°C for 1 hour in an electrical box furnace with heating rate 1oC/min and holding time for 1 hour. Apparent density and porosity were determined by standar methods for ceramic materials. Phase composition of the ceramic support was established by X-Ray Diffraction analysis. SEM studies of the membranes added at different CuZn were carried out.

scholarly journals Synthesis and Optoelectronic Properties of Iptycene–Naphthazarin Dyes

Synlett ◽  
2018 ◽  
Vol 30 (01) ◽  
pp. 54-58 ◽  
Author(s):  
Timothy Swager ◽  
Cagatay Dengiz ◽  
You-Chi Wu
Keyword(s):  
Single Crystal ◽  
Electronic Properties ◽  
Diels Alder ◽  
Optoelectronic Properties ◽  
Synthesis And Characterization ◽  
Nmr Analysis ◽  
X Ray ◽  
Vis Spectroscopy

We report the synthesis and characterization of iptycene–naphthazarin dyes by using a sequential Diels–Alder approach. The tautomerization of naphthazarin was used as the key step in the synthesis, with structures confirmed by single-crystal X-ray and NMR analysis. The systematic trends in electronic properties were investigated by UV/Vis spectroscopy. BF2 complexes of the dyes were prepared by reaction with BF3·OEt2 in CH2Cl2.

scholarly journals Synthesis and Characterization of Boron, Copper, and Zinc-Doped Hydroxyapatite by Sol-Gel Method: Research of Absorption and Thermal Behavior

2021 ◽  
Author(s):  
Dilek Çanakçı
Keyword(s):  
Thermal Behavior ◽  
Sol Gel ◽  
Absorption Bands ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Copper And Zinc ◽  
Vis Spectroscopy ◽  
Metal Doped

Abstract In this study, hydroxyapatites reinforced with Boron, Copper and Zinc at different rates were produced using the sol-gel method. Different amounts of metal during the production of hydroxyapatite were used to observe the amount of crystallization and morphological differences in their structures. The characterization of the metal-doped HAp was carried out by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX). The data indicated that the Ca/P stoichiometric ratios of the samples varied between 1.71 and 2, so their morphologies were different from each other. The absorption behavior of novel metal-doped HAp samples was evaluated at room temperature by UV-vis spectroscopy. In the absorption spectra of the samples, absorption bands formed in similar regions. In addition, the thermal behavior of HAp samples was investigated using TG/DTA techniques. The results of the analysis showed that heat resistance of the new synthesized samples was quite high.

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