Structural and Optical Properties of Nanophotonic LiNbO3 under Stirrer Time Effect

2018 ◽  
Vol 39 (3) ◽  
pp. 297-306 ◽  
Author(s):  
Makram A. Fakhri ◽  
Y. Al-Douri ◽  
A. Bouhemadou ◽  
M. Ameri
Keyword(s):  
Optical Waveguides ◽  
Time Effect ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Optical Dielectric Constant ◽  
Optical Dielectric ◽  
Uv Visible

Abstract Lithium niobate (LiNbO3) nanostructures are synthesized on n-silicon substrate by spin coating technique with stirrer times; 8 h, 24 h and 48 h. LiNbO3 is characterized and analyzed by Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM), X-ray diffraction (XRD) and UV-visible and Photoluminescence (PL). The measurements show that as stirrer time increases, the structures start to crystallize to become more regular distribution, which helps to apply in optical waveguides. In addition, the calculated refractive index and optical dielectric constant are in agreement with experimental data.

Epitaxial BaTiO3 Thin Films on Different Substrates for Optical Waveguide Applications

1999 ◽  
Vol 597 ◽  
Author(s):  
M. Siegert ◽  
Judit G. Lisoni ◽  
C. H. Lei ◽  
A. Eckau ◽  
W. Zander ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Waveguides ◽  
Rutherford Backscattering Spectrometry ◽  
Optical Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Ion Channeling ◽  
Atomic Force ◽  
Transmission Electron

AbstractIn the process of developing thin film electro-optical waveguides we investigated the influence of different substrates on the optical and structural properties of epitaxial BaTiO3 thin films. These films are grown by on-axis pulsed laser deposition (PLD) on MgO(100), MgAl2O4(100), SrTiO3(100) and MgO buffered A12O3(1102) substrates. The waveguide losses and the refractive indices were measured with a prism coupling setup. The optical data are correlated to the results of Rutherford backscattering spectrometry/ion channeling (RBS/C). X-ray diffraction (XRD), atomic force microscopy (AFM) and transmission electron microscopy (TEM). BaTiO3 films on MgO(100) substrates show planar waveguide losses of 3 dB/cm and ridge waveguide losses of 5 dB/cm at a wavelength of 633 nm.

High-Quality GaN Grown by Molecular Beam Epitaxy on Ge(001)

1999 ◽  
Vol 572 ◽  
Author(s):  
H. Siegle ◽  
Y. Kim ◽  
G. S. Sudhir ◽  
J. Kruger ◽  
P. Perlin ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Low Temperatures ◽  
Molecular Beam ◽  
Substrate Material ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Alternative Substrate ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTWe report on growth of GaN on Germanium as an alternative substrate material. The GaN films were deposited on Ge(001) substrates by plasma-assisted molecular beam epitaxy. Atomic force microscopy, x-ray diffraction, photoluminescence, and Raman spectroscopy were used to characterize the structural and optical properties of the films. We observed that the Ga/N ratio plays a crucial role in determining the phase purity and crystal quality. Under N-rich conditions the films were phase-mixed, containing cubic and hexagonal GaN, while in the Ga-rich regime they were purily hexagonal. The latter samples show bandedge luminescence with linewidths as small as 31 meV at low temperatures.

scholarly journals Effect of Cadmium Concentration on Structural, Optical, and Electrical Properties of Cu2Zn1−xCdxSnS4Quinternary Alloy Nanofibres, Synthesized by Electrospinning Technique

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
A. S. Ibraheam ◽  
Y. Al-Douri ◽  
Nabeel Z. Al-Hazeem ◽  
U. Hashim ◽  
Deo Prakash ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Power Conversion ◽  
Cadmium Concentration ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Current Voltage ◽  
Uv Visible

The Cu2Zn1−xCdxSnS4quinternary alloy nanofibres with different Cd concentrations were grown on glass substrate using the electrospinning technique. The structural properties of Cu2Zn1−xCdxSnS4quinternary alloy nanofibres were investigated by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). Optical properties were analysed through UV-visible spectrophotometry (UV-Vis) and photoluminescence (PL) spectroscopy, which revealed that there is a decrease in band gap from 1.75 eV to 1.61 eV, with the increasing Cd concentration fromx= 0 tox= 1. The current-voltage measurements exhibited a power conversion efficiency of 3% under the solar illumination with intensity of 100 mW/cm2. Electrical properties supported that the Cu2Zn1−xCdxSnS4quinternary alloy can be used as an absorber in solar cells. The bulk modulus, refractive index, and dielectric constant were also investigated.

scholarly journals Photo-Irradiated Biosynthesis of Silver Nanoparticles Using Edible MushroomPleurotus floridaand Their Antibacterial Activity Studies

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Ravishankar Bhat ◽  
Raghunandan Deshpande ◽  
Sharanabasava V. Ganachari ◽  
Do Sung Huh ◽  
A. Venkataraman
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Synthetic Procedure ◽  
Uv Visible

This is a report on photo-irradiated extracellular synthesis of silver nanoparticles using the aqueous extract of edible oyster mushroom (Pleurotus florida) as a reducing agent. The appearance, size, and shape of the silver nanoparticles are understood by UV-visible spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The X-ray diffraction studies, energy dispersive X-ray analysis indicate that particles are crystalline in nature. Fourier transform infrared spectroscopy analysis revealed that the nanoparticles are covered with biomoieties on their surface. As can be seen from our studies, the biofunctionalized silver nanoparticles thus produced have shown admirable antimicrobial effects, and the synthetic procedure involved is eco-friendly and simple, and hence high range production of the same can be considered for using them in many pharmaceutical applications.

scholarly journals A Review on Common Methods for Characterizing Graphene Oxide (GO)

2019 ◽  
pp. 1-8
Author(s):  
Md. Shafiul Islam
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Chemical Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
The Past ◽  
Atomic Force ◽  
Scientific World ◽  
Uv Visible

Graphene oxide, two-dimensional material with the thickness of 1.1±0.2 nm, has gained attention to a greater extent in the field of science for its radically distinctive properties: physical, chemical, optical as well as electrical etc. Graphene oxide (monolayer sheet) has been synthesized by oxidizing graphite (millions of layer) to graphite oxide (multilayers) which has been converted into graphene oxide via exfoliation followed by sonication and centrifugation - a method mentioned as Modified Hummer Method. I focus on the chemical structure of graphene oxide. However, I discuss the different analytical methods such as UV-Visible spectroscopy, Atomic Force Microscopy (AFM), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR) as well as X-ray Diffraction pattern for characterizing the graphene oxide. Furthermore, this review covers the analytical evaluation of graphene oxide and discuss the past, present and future of graphene oxide in the scientific world.

Structural and Optical Properties of In0.27Ga0.73N/Si (111) Film Grown Using PA-MBE Technique

2012 ◽  
Vol 620 ◽  
pp. 368-372 ◽  
Author(s):  
Saleh H. Abud ◽  
Hassan Zainuriah ◽  
Fong Kwong Yam ◽  
Alaa J. Ghazai
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Molecular Beam ◽  
Grown Film ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Force Microscopy ◽  
Room Temperature Photoluminescence ◽  
Atomic Force

In this paper, InGaN/GaN/AlN/Si (111) structure was grown using a plasma-assisted molecular beam epitaxy (PA-MBE) technique. The structural and optical properties of grown film have been characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), high resolution X-ray diffraction (HR-XRD) and photoluminescence (PL). Indium-mole fraction has been computed to be 0.27 using XRD data and Vegards law with high grain size and low tensile strain. Room-temperature photoluminescence revealed an intense peak at 534 nm (2.3 eV) related to our sample In0.27Ga0.73N.

STRUCTURAL AND OPTICAL PROPERTIES OF ZnO THIN FILMS GROWN ON FLEXIBLE POLYIMIDE SUBSTRATES

2007 ◽  
Vol 14 (04) ◽  
pp. 801-805 ◽  
Author(s):  
DONG ICK SON ◽  
JUNG WOOK LEE ◽  
DEA UK LEE ◽  
TAE WHAN KIM ◽  
WON KOOK CHOI
Keyword(s):  
Thin Films ◽  
Zno Thin Films ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Diffraction Patterns ◽  
Microscopy Images

Nominally undoped ZnO thin films were grown on polyimide (PI) substrates at various temperatures by using radio-frequency magnetron sputtering. Atomic force microscopy images showed that the root mean squares of the average surface roughnesses for the ZnO thin films grown on the PI substrates at 27°C, 100°C, 200°C, and 300°C were 4.08, 4.50, 4.18, and 3.89 nm, respectively. X-ray diffraction patterns showed that the crystallinity of the ZnO films had a preferential (0001) direction and that the full width at half-maxima for the (0002) ZnO diffraction peak for the ZnO thin films grown on the PI substrates at 27°C, 100°C, 200°C, and 300°C were 0.22, 0.22, 0.22, and 0.23, respectively. The average optical transmittances in the visible ranges between 550 and 750 nm for the ZnO /PI heterostructures grown at 27°C, 100°C, 200°C, and 300°C were 87%, 83%, 87%, and 78%, respectively.

Investigation of the Effect of Uv-Assisted Oxidation and Nitridation of Hafnium Metal Films

2003 ◽  
Vol 780 ◽  
Author(s):  
C. Essary ◽  
V. Craciun ◽  
J. M. Howard ◽  
R. K. Singh
Keyword(s):  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Grazing Angle ◽  
X Ray Diffraction ◽  
Metal Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Silicon Interface

AbstractHf metal thin films were deposited on Si substrates using a pulsed laser deposition technique in vacuum and in ammonia ambients. The films were then oxidized at 400 °C in 300 Torr of O2. Half the samples were oxidized in the presence of ultraviolet (UV) radiation from a Hg lamp array. X-ray photoelectron spectroscopy, atomic force microscopy, and grazing angle X-ray diffraction were used to compare the crystallinity, roughness, and composition of the films. It has been found that UV radiation causes roughening of the films and also promotes crystallization at lower temperatures.Furthermore, increased silicon oxidation at the interface was noted with the UVirradiated samples and was shown to be in the form of a mixed layer using angle-resolved X-ray photoelectron spectroscopy. Incorporation of nitrogen into the film reduces the oxidation of the silicon interface.

Low Molecular Weight Microfibers with Light Sensing Properties

2017 ◽  
Vol 54 (4) ◽  
pp. 655-658
Author(s):  
Andrei Bejan ◽  
Dragos Peptanariu ◽  
Bogdan Chiricuta ◽  
Elena Bicu ◽  
Dalila Belei
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
X Ray Diffraction ◽  
Aromatic Rings ◽  
X Ray ◽  
Force Microscopy ◽  
Light Sensing ◽  
Sensing Applications ◽  
Atomic Force ◽  
Low Molecular Weight Compounds

Microfibers were obtained from organic low molecular weight compounds based on heteroaromatic and aromatic rings connected by aliphatic spacers. The obtaining of microfibers was proved by scanning electron microscopy. The deciphering of the mechanism of microfiber formation has been elucidated by X-ray diffraction, infrared spectroscopy, and atomic force microscopy measurements. By exciting with light of different wavelength, florescence microscopy revealed a specific optical response, recommending these materials for light sensing applications.

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