scholarly journals Effect of thickness on optical properties of pure Epoxy Resin plates

2014 ◽  
Vol 11 (2) ◽  
pp. 554-559
Author(s):  
Baghdad Science Journal
Keyword(s):  
Optical Properties ◽  
Epoxy Resin ◽  
Energy Gap ◽  
Visible Region ◽  
Refraction Index ◽  
Ultraviolet Region ◽  
Intensity Increase ◽  
Absorption Intensity ◽  
Light Region ◽  
Different Thickness

In this study, Epoxy Resin plates was prepared by mixing epoxy(A) and hardner(B)with ratio(A:B) (3:1) with different thickness (0.3-0.96)cm. The effect of thickness on optical properties have been studied (absorption ,transmission ,reflectance) also the optical constant were found like (absorption coefficient, extenuation coefficient and refraction index) for all of the prepared plates. The results have shown that by increasing the thickness of plates., the absorption intensity increase in which at plates thickness (0.3-0.96)cm the absorption intensity were(1.54-1.43) respectively, and since absorption peak for epoxy occur in ultraviolet region and exactly at wavelength(368)nm and energy gap(Eg=3.05 eV) thus their good transmittance in the visible light region The plates have transmittance of about (60-83.4)% in visible region ,the refraction index for Elda epoxy is (n= 1.53 ) and its reflectance is (R=4 )% at wavelength (368 nm).

scholarly journals Optical Properties and Conductivity of PVA–H3PO4 (Polyvinyl Alcohol–Phosphoric Acid) Film Blend Irradiated by γ-Rays

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1065
Author(s):  
Susilawati Susilawati ◽  
Saiful Prayogi ◽  
Muhamad F. Arif ◽  
Noor Maizura Ismail ◽  
Muhammad Roil Bilad ◽  
...  
Keyword(s):  
Optical Properties ◽  
Radiation Dose ◽  
Optical Absorption ◽  
Phosphoric Acid ◽  
Polyvinyl Alcohol ◽  
Polymer Film ◽  
Energy Gap ◽  
Visible Region ◽  
Ultraviolet Region ◽  
Γ Rays

This study assesses the optical properties and conductivity of PVA–H3PO4 (polyvinyl alcohol–phosphoric acid) polymer film blend irradiated by gamma (γ) rays. The PVA–H3PO4 polymer film blend was prepared by the solvent-casting method at H3PO4 concentrations of 75 v% and 85 v%, and then irradiated up to 25 kGy using γ-rays from the Cobalt-60 isotope source. The optical absorption spectrum was measured using an ultraviolet–visible spectrophotometer over a wavelength range of 200 to 700 nm. It was found that the absorption peaks are in three regions, namely two peaks in the ultraviolet region (310 and 350 nm) and one peak in the visible region (550 nm). The presence of an absorption peak after being exposed to hυ energy indicates a transition of electrons from HOMO to LUMO within the polymer chain. The study of optical absorption shows that the energy band gap (energy gap) depends on the radiation dose and the concentration of H3PO4 in the polymer film blend. The optical absorption, absorption edge, and energy gap decrease with increasing H3PO4 concentration and radiation dose. The interaction between PVA and H3PO4 blend led to an increase in the conductivity of the resulting polymer blend film.

First-Principles Study on Electronic and Optical Properties in Pr-Doped Anatase TiO2

2014 ◽  
Vol 924 ◽  
pp. 260-268 ◽  
Author(s):  
Hao Chen ◽  
Lan Fang Yao ◽  
Song Lin Yang ◽  
Ya Qin Wang ◽  
Xing Liang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
First Principles ◽  
Energy Gap ◽  
Impurity Band ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Light Region ◽  
Overlap Population ◽  
Calculation Results

The crystal structures, band structures, density of states, charge density, overlap population and optical properties of pure anatase TiO2 and Pr-doped anatase TiO2 were studied by using the plane-wave pseudopotential method based on the first-principles. After Pr doping, the valence band and the conduction band moved down and became dense, energy gap became narrow and a impurity band which consists of Pr 4f states appeared. And the dipole moment got improved, which is good for the separate of the electron-hole pairs. These effectively overcome two huge shortcomings of TiO2. Besides, Pr-doped anatase TiO2 produced more carriers which have good transport properties and the absorption spectra of Pr-O bond appear in the region that the wavelength is longer. The calculation results of optical properties show that the absorption edge occured red shift, which means the photocatalytic activity of anatase TiO2 got remarkable improved during visible-light region. This conforms to the previous analysis. So the photocatalytic activity of anatase TiO2 got remarkable improved after Pr doping.

Electronic and Optical Properties of Indium Selenide Nanosheet Using First-Principle Calculations

2019 ◽  
Vol 11 (11) ◽  
pp. 1148-1154
Author(s):  
Hamza A. Mezerh ◽  
Kadhim J. Kadhim ◽  
Hamad Rahman Jappor
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Density Functional ◽  
Visible Region ◽  
High Refractive Index ◽  
Indium Selenide ◽  
Experimental Investigations ◽  
Ultraviolet Region ◽  
Electronic And Optical Properties ◽  
Index Value

Density functional theory (DFT) have been used to examine the electronic and optical, properties of two-dimensional (2D) indium selenide (InSe) nanosheet. Our calculations indicate that the energy band gap of InSe is indirect and equal to 1.53 eV. It can be seen that for the pristine case, the majority and minority density of state (DOS) are fully symmetric. The optical properties are considered up to 36 eV. Our results established that the absorption starts in the visible region, while the peaks in the ultraviolet region. The refractive index value is 1.84 at zero photon energy limit and increase to 2.31. The high refractive index allows this nanosheet to be utilized as an internal layer coating between the substrate and the ultraviolet absorbing layer. Additionally, we observed that the gained optical properties of InSe nanosheet are in the ultraviolet range and the results are significant. It is expected that from these calculations to provide useful information for further experimental investigations of InSe nanosheet.

STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES OF ZnxSy (x + y = 2 TO 4) NANOCLUSTERS: A B3LYP-DFT STUDY

2011 ◽  
Vol 10 (01n02) ◽  
pp. 341-344
Author(s):  
P. S. YADAV ◽  
D. K. PANDEY ◽  
S. AGRAWAL ◽  
B. K. AGRAWAL
Keyword(s):  
Optical Properties ◽  
Visible Region ◽  
Zero Point ◽  
Binding Energies ◽  
Ultraviolet Region ◽  
Point Energy ◽  
Electronic And Optical Properties ◽  
The Stability ◽  
The One ◽  
Homo Lumo

The stability, structural, electronic, and optical properties have been studied for most stable zinc sulfide nanoclusters Zn x S y (x + y = n = 2 to 4). A B3LYP-DFT/6-311G(3df) method is employed to optimize the geometries, and a TDDFT method is used for the study of the optical properties. The binding energies (BE), HOMO–LUMO gaps and the bond lengths have been obtained for all the clusters. We have considered also the zero point energy (ZPE) corrections ignored by the earlier workers. For a fixed value of n, we designate the most stable structure the one, which has maximum final binding energy per atom. The adiabatic and vertical ionization potentials (IP) and electron affinities (EA), charge on atoms, dipole moment, and optical properties have been investigated for the most stable structures. The nanoclusters containing large number of S atoms for each "n" are found to be most stable. Except for ZnS nanocluster, the HOMO–LUMO gap increases with the number of S atoms. Similarly, except for ZnS , IP and EA fluctuate with the cluster size but reveal downward trend. The optical absorption is quite weak in visible region but is strong in the ultraviolet region in most of the nanoclusters except a few. The growth of most stable nanoclusters may be possible in the experiments.

Investigation of Optical Properties of ZnO/MnO2, ZnO/TiO2 and ZnO/MnO2/TiO2 Nanocomposites

2014 ◽  
Vol 938 ◽  
pp. 123-127 ◽  
Author(s):  
G. Shanmuganathan ◽  
I.B. Shameem Banu
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Energy Gap ◽  
Visible Region ◽  
Solid State Reaction Method ◽  
Morphological Properties ◽  
Energy Dispersive Analysis ◽  
Reaction Method ◽  
Uv Visible

ZnO nanocomposites such as (ZnO)0.8(MnO2)0.2, (ZnO)0.8(TiO2)0.2and (ZnO)0.8(MnO2)0.1(TiO2)0.1were prepared by solid state reaction method at room temperature. The structural analysis was carried out with help of powder XRD to confirm the formation of the composites. The morphological properties and presence of elemental compositions were analyzed with scanning electron microscope and energy dispersive analysis spectroscopy respectively. Optical properties were studied with UV visible spectrophotometer. From the transmittance spectrum, it is concluded that the synthesized composite materials have the transmittance in the range of 80 to 95% in the visible region. The calculated optical band gap values for pure ZnO is 3.16 eV and the values are 3.7eV, 5.27eV and 4.46eV for the composites ZnO/MnO2, ZnO/TiO2and ZnO/MnO2/TiO2, respectively. The study has found that the ZnO/MnO2, ZnO/TiO2and ZnO/MnO2/TiO2composites have very large energy gap as that of insulator.

STRUCTURAL, ELECTRONIC, MAGNETIC, AND OPTICAL PROPERTIES OF 3d TRANSITION METAL ENDOHEDRAL M@Ge12H12(M=Sc–Ni) CLUSTERS

2013 ◽  
Vol 12 (07) ◽  
pp. 1350063 ◽  
Author(s):  
CHUNMEI TANG ◽  
WEIHUA ZHU ◽  
AIMEI ZHANG ◽  
MINGYI LIU ◽  
KAIXIAO ZHANG
Keyword(s):  
Optical Properties ◽  
Energy Gap ◽  
Visible Region ◽  
Closed Shell ◽  
Building Blocks ◽  
Potential Applications ◽  
Vertical Electron Affinity ◽  
Ni Clusters ◽  
Homo Lumo ◽  
Magic Cluster

The fulerine- Ni @ Ge 12 H 12 structure, which composes of four pentagons and four rhombi and is like a fullerene, has a closed-shell electronic structure, the largest HOMO–LUMO energy gap, the highest vertical ionization potential, and the lowest vertical electron affinity. All of these properties are characteristic of a magic cluster, therefore, we strongly suggest fulerine- Ni @ Ge 12 H 12 should be a magic cluster and promising as building blocks in developing cluster-assembled nanomaterials. This can be interpreted by the weak interaction between Ni and the cage together with the transference of two electrons from the 4s orbital to the 3d orbital of Ni . The magnetic moment of fulerine- M @ Ge 12 H 12( M = Sc – Ni ) varies from 0 to 3 μB, implying they have potential applications in developing new nanomaterials with tunable magnetic properties. The calculated TDDFT optical properties of fulerine- M @ Ge 12 H 12( M = Sc – Ni ) can be tuned broadly in the ultraviolet–visible region. This is very important for optoelectronic applications.

scholarly journals The effect of thickness on the optical properties of Cu2S thin films

2019 ◽  
Vol 13 (26) ◽  
pp. 121-127
Author(s):  
Nadia Jasim Ghdeeb
Keyword(s):  
Optical Properties ◽  
Optical Constants ◽  
Energy Gap ◽  
Spray Pyrolysis Method ◽  
Chemical Spray Pyrolysis ◽  
Direct Transition ◽  
Pyrolysis Method ◽  
Clean Glass Substrate ◽  
Chemical Spray ◽  
Different Thickness

In this work, the optical properties of Cu2S with different thickness(1400, 2400, 4400) Ǻ have been prepared by chemical spray pyrolysis method onto clean glass substrate heated at 283 oC ±2. The effectof thickness on the optical properties of Cu2S has been studied. Itwas found that the optical properties of the electronic transitions onfundamental absorption edge were direct allowed and the value of theoptical energy gap of Cu2S (Eg) for direct transition decreased from(2.4-2.1) eV with increasing of the thickness from (1400 - 4400)Ǻrespectively. Also it was found that the absorption coefficient isincreased with increasing of thicknesses. The optical constants suchas extinction coefficient, refractive index and the imaginary part ofthe dielectric constant have similar termed of variation for theabsorption coefficient.

scholarly journals About complex refractive index of black Si

2017 ◽  
Vol 68 (7) ◽  
pp. 81-83
Author(s):  
Emil Pinčík ◽  
Robert Brunner ◽  
Hikaru Kobayashi ◽  
Milan Mikula
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Complex Refractive Index ◽  
Black Silicon ◽  
Nano Crystalline ◽  
Light Region ◽  
Chemical Transfer ◽  
Transfer Method ◽  
Different Thickness ◽  
Ir Light

Abstract The paper deals with the complex refractive index in the IR light region of two types of samples (i) as prepared black silicon, and (ii) thermally oxidized black silicon (BSi) nano-crystalline specimens produced both by the surface structure chemical transfer method using catalytic Ag evaporated spots (as prepared sample) and by the catalytic Pt catalytic mesh (thermally oxidized sample). We present, compare, and discuss the values of the IR complex refractive index obtained by calculation using the Kramers-Krönig transformation. Results indicate that small differences between optical properties of as prepared black Si and thermally oxidized BSi are given by: (i) – oxidation procedure, (ii) – thickness of the formed black Si layer, mainly, not by utilization of different catalytic metals, and by iii) the different thickness. Contamination of the surface by different catalytic metals contributes almost equally to the calculated values of the corresponding complex refractive index.

scholarly journals Designing A Zener Diode Using Ag2O(1-X)Zno(X)/Psi Structures Deposited by Laser Induced Plasma Technique

2020 ◽  
pp. 1032-1039
Author(s):  
Raied K. Jamal ◽  
Falah Hassen Ali ◽  
Mohammed M. Hameed ◽  
Kadhim Abdulwahid Aadim
Keyword(s):  
Energy Gap ◽  
Visible Region ◽  
Ultraviolet Region ◽  
Mixing Ratio ◽  
Zener Diode ◽  
Laser Induced Plasma ◽  
Mixing Ratios ◽  
Plasma Technique ◽  
Glass Slides ◽  
P Type

In this paper Zener diode was designed by mixing three mixing ratios of Ag2O(1-x)ZnO(x), where x is 0.5, 0.3, and 0.1, that are deposited on a p-type porous silicon using laser induced plasma technique at room temperature (RT). The results of the Zener diode showed a decrease in knee and Zener voltage when the mixing ratio of Ag2O(1-x)ZnO(x) structure was increased. Nanofilms of 200nm thickness were prepared from pure ZnO and Ag2O as well as Ag2O(1-x)ZnO(x) with three maxing ratios and deposited on glass slides at RT to analyze the structure and optical properties. The structures of Ag2O and Ag2O(1-x)ZnO(x) showed high absorbance in the visible region with redshift in spectra when the mixing ratio was increased, while ZnO had a high absorbance  in the ultraviolet region. It is concluded that when the value of x increases the energy gap value for the Ag2O(1-x)ZnO(x) structure decreases.

scholarly journals Study the Effect of Thickness on Optical Properties of Titanium Dioxide (TiO2) That Preparation of Via the Sol-Gel Process

2020 ◽  
Vol 12 (01) ◽  
pp. 73-78
Author(s):  
Mohammed Sami Abdali ◽  
◽  
Ahmed Shaker Hussein ◽  
Mohammed Hadi Shinen ◽  
◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Optical Properties ◽  
Tio2 Thin Film ◽  
Research Study ◽  
Energy Gap ◽  
Sol Gel ◽  
Thickness Effect ◽  
Sol Gel Process ◽  
Different Thickness ◽  
Process Method

This research, study the effect of the thickness on titanium dioxide (TiO2) , that prepared by the Sol-Gel Process method on the optical properties of (TiO2) thin film with different thickness (54, 64 and 89 nm), the thickness effect on optical properties (energy gap , absorbance spectrum, transmittance spectrum, reflectance, refractive index, extinction coefficient, absorption coefficient, real and imaginary dielectric constant) ,this study shows that thickness have an effect on all these parameters .

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