scholarly journals Variations in Optical Properties of ZnS/Cu/ZnS Nanostructures Due to Thickness Change of ZnS Cap Layer

2016 ◽  
Vol 2 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Haidar Howari ◽  
Islam Uddin
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Glass Substrate ◽  
Physical Vapor Deposition ◽  
Low Cost ◽  
High Refractive Index ◽  
Thickness Change ◽  
Good Thermal Stability ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

Nanostructures of ZnS/Cu/ZnS were deposited on glass substrate using physical vapor deposition technique. The thickness of the first and last ZnS layers was altered, while the thickness of the embedded Cu layer was fixed at 50 nm. The produced nanostructures were of good quality. Spectrophotometric measurements were carried out on the nanostructures to investigate the optical properties. The transmission and reflectivity spectra were recorded and studied in details. ZnS was selected due to its high refractive index, ease of deposition, and low cost. The copper layer was used because of its low absorption in the visible part of the spectrum and its thermal stability. The ZnS layer was found not only to anti-reflective the Cu layer, but also to stabilize the nanostructure, improve its adherence on glass substrate, and increase the film thermal resistance up to 240 °C. Furthermore, all the samples exhibit good thermal stability up to 240 °C upon annealing for two hours.

scholarly journals Fabrication of temperature sensor based on copper oxide nanowires grown on titanium coated glass substrate

2018 ◽  
Vol 36 (3) ◽  
pp. 460-468 ◽  
Author(s):  
Ali A. Aljubouri ◽  
Abdulqader D. Faisal ◽  
Wafaa K. Khalef
Keyword(s):  
Copper Oxide ◽  
Temperature Sensor ◽  
Glass Substrate ◽  
Physical Vapor Deposition ◽  
Copper Film ◽  
High Sensitivity ◽  
Infrared Thermal Imaging ◽  
Oxide Nanowires ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

AbstractSingle phase, adherent films of copper oxide nanowires (CuO NWs) were successfully grown on a glass substrate. Titanium nanofilm was pre-coated on the glass substrate to assist the growth of a layer adherent to the substrate. The copper film of 1.5 μm thickness was deposited via physical vapor deposition technique followed by thermal oxidation in air at various temperatures for 4 h. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis) and Fourier transformation infrared (FT-IR) spectroscopy to find the crystal structure, morphology, phases, and optical properties of the deposited films. The CuO NWs film with 60% transmittance at wavelengths greater than 800 nm was obtained. It can be used as an infrared thermal imaging filter and in optoelectronic devices. The fabricated temperature sensor exhibited high sensitivity in the temperature range of 20 °C to 180 °C.

scholarly journals Effect of Thickness on Structural and Optical Properties of Tetra-tert- butyl-2, 3-naphthalocyanine Thin Films

2011 ◽  
Vol 8 (4) ◽  
pp. 1686-1695 ◽  
Author(s):  
I. Dhanya ◽  
C S Menon
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Physical Vapor Deposition ◽  
Band Gap Energy ◽  
Dielectric Constants ◽  
Localized States ◽  
Optical Parameters ◽  
Tert Butyl ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

Amorphous tetra-tert-butyl-2, 3-naphthalocyanine thin films have been deposited using physical vapor deposition technique under a varied thickness by adjusting the coating time. By analyzing the x-ray diffraction, the structure of as deposited films is found to be non-crystalline. Different optical properties of these thin films have been investigated by means of optical absorption and reflection spectra. Various optical constants like band gap energy, Egthe width of band tails of localized states into the gap, EUand steepness parameter, β gets calculated and the variation of different optical parameters like refractive index, extinction coefficient, dielectric constants, optical conductivity and surface and volume energy losses with photon energy are estimated.

scholarly journals A Combined Experimental and Tddft-dft Investigation of Structural and Optical Properties of Novel Pyrazole-1, 2, 3-triazole Hybrids as Optoelectronic Devices

2021 ◽  
Author(s):  
Islam H. El Azab ◽  
A. Ibrahim ◽  
M. Abdel El-Moneim ◽  
M. Sh. Zoromba ◽  
Mohamed Helmy Abdel-Aziz ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Electronic Transition ◽  
Physical Vapor Deposition ◽  
Defect Formation ◽  
Energy Gap ◽  
Promising Result ◽  
Optoelectronic Device ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

Abstract A conjugated semiconductor thin film of 1-((3-(3-(3,5-diphenyl-4,5-dihydro-1H-pyrazol-1-yl)-5-methyl-1H-1,2,4-triazol-1-yl)-1-phenyl-1H-pyrazol-4-yl)methyl)-4-phenyl-1H-1,2,3-triazole [4ph-TAzole]TF was synthesized. The characterization of the obtained [4ph-TAzole]TF powder is carried out using different techniques includes FTIR, UV-Vis, 1HNMR, XRD, and mass spectra. The fabricated [4ph-TAzole]TF thin film with a thickness of 150 ± 3 nm is manufactured by physical vapor deposition technique (PVD) at a low deposition rate with basic pressure of the chamber was 5×10− 5 mbar. Using DFT-TDDFT simulation, the structure measurements can determine the energy gap and optical properties. The obtained DFT-TDDFT data provide good proof for the electronic transition in zero-dimensional [4ph-TAzole]TF as a single crystal molecule. This study provides valuable information on the nature and sources of defect formation and electronic transition in conductor organic derivate of triazole which open the way for the application as an optoelectronic device. Application Davis’s and Shilliday’s equation on [4ph-TAzole]TF mentioned that the \({\text{E}}_{\text{g}}^{\text{D}\text{i}\text{r}}\)and \({\text{E}}_{\text{g}}^{\text{I}\text{n}\text{d}}\)transitions can be computed by plotting \(({{\alpha }\text{h}{\nu })}^{2}\) and \(({{\alpha }\text{h}{\nu })}^{0.5}\) versus \(\text{h}{\nu }\) nearby the value of fundamental band edge (\(({{\alpha }\text{h}{\nu })}^{2}\) and \(({{\alpha }\text{h}{\nu })}^{0.5}\) parts) in the computed Abs. (λ) curves to zero absorption value, respectively. The direct and indirect energies were 2.651eV and 3.01 eV for [4ph-TAzole]TF, respectively. The obtained thin film presents a promising result to be a good candidate for organic derivate of triazole solar cell applications.

scholarly journals Features of optical properties of high stable CdTe photovoltaic absorber layer

2020 ◽  
Vol 21 (2) ◽  
pp. 243-253
Author(s):  
R.S. Yavorskyi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Cadmium Telluride ◽  
Physical Vapor Deposition ◽  
Vacuum Chamber ◽  
Wavelength Region ◽  
Thermal Evaporation Method ◽  
Vapor Deposition Technique ◽  
Transmission Measurements ◽  
Physical Vapor Deposition Technique

In this paper, the technology of obtaining and effect of annealing on the morphology and optical properties of cadmium telluride thin films has been investigated. The effect of vacuum chamber modes on the growth of thin films has been studied. For obtained cadmium telluride thin films were used a modified thermal evaporation method deposited by Physical Vapor Deposition technique on a glass substrate with different thicknesses. The transmission measurements were carried with UV-ViS-NIR Spectrophotometer in the wavelength range 180-3300 nm, to analyze the optical properties as a function of wavelength. The optical band gap values were 1.49 eV for as-grown films and 1.46 eV after annealing. The refractive indexes of the samples were defined in the range of 2.6 – 2.8 for as-grown films and the indexes have increased after annealing depending on the wavelength region and film thickness. After annealing, the coalescence mode of growth is observed.

Advances in preparation, modification, and application of polypropylene membrane

2016 ◽  
Vol 36 (4) ◽  
pp. 329-362 ◽  
Author(s):  
Nurul F. Himma ◽  
Sofiatun Anisah ◽  
Nicholaus Prasetya ◽  
I Gede Wenten
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Chemical Resistance ◽  
Low Cost ◽  
Comprehensive Overview ◽  
Preparation Methods ◽  
Good Thermal Stability ◽  
Polypropylene Membrane ◽  
Membrane Fabrication ◽  
Potential Applications

Abstract Polypropylene (PP) is one of the most used polymers for microporous membrane fabrication due to its good thermal stability, chemical resistance, mechanical strength, and low cost. There have been numerous studies reporting the developments and applications of PP membranes. However, PP membrane with high performance is still a challenge. Thus, this article presents a comprehensive overview of the advances in the preparation, modification and application of PP membrane. The preparation methods of PP membrane are firstly reviewed, followed by the modification approaches of PP membrane. The modifications includes hydrophilic and superhydrophobic modification so that the PP membranes become more suitable to be applied either in aqueous applications or in non-aqueous ones. The fouling resistant of hydrophilized PP membrane and the wetting resistant of superhydrophobized PP membrane are then reviewed. Finally, special attention is given to the various potential applications and industrial outlook of the PP membranes.

Blue-emitting butterfly-shaped donor–acceptor-type 1,3,5,9-tetraarylpyrenes: easily available, low-cost conventional fluorophores for high-performance near ultraviolet electroluminescence with CIEy < 0.05

2021 ◽  
Vol 9 (1) ◽  
pp. 260-269
Author(s):  
Huijuan Ran ◽  
Zhen Zhao ◽  
Xuewei Duan ◽  
Fuli Xie ◽  
Ruijun Han ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Low Cost ◽  
Good Thermal Stability ◽  
Near Ultraviolet ◽  
Donor Acceptor ◽  
Blue Emitters

Three donor–acceptor (DA)-type pyrene-based blue emitters with good thermal stability and their applications in NUV OLEDs are demonstrated.

scholarly journals Preparation and Thermal Properties of Modified Cu2O/Polypropylene (PP) Composite

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 309
Author(s):  
Yurong Wu ◽  
Longshan Xu ◽  
Yanying Jiang
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Thermal Properties ◽  
Coupling Agent ◽  
Cuprous Oxide ◽  
Silane Coupling Agent ◽  
Low Cost ◽  
Good Thermal Stability ◽  
Silane Coupling ◽  
Pp Composites

A uniform, monodispersed superfine cuprous oxide (Cu2O) sphere with a mean diameter of 850 nm has been synthesized by solution reduction. The study reported the synthesis and thermal properties of Cu2O/PP composites for the first time. The surface modification of the superfine Cu2O sphere was carried out by using a silane coupling agent KH-570. Fourier-transform infrared (FTIR) spectroscopy and the thermogravimetric analysis (TGA) curve revealed that the Cu2O had been successfully modified by silane coupling agent KH570. The scanning electron microscope (SEM) shows that the modified Cu2O can be uniformly dispersed in the polypropylene (PP) matrix, because through surface modification, there are some active functional groups on its surface, such as the ester group, which improves its compatibility with the PP matrix. The thermal stability of Cu2O/PP composites was improved by adding a small amount of Cu2O (1 wt % of PP). Therefore, based on the potential bacteriostasis of cuprous oxide, the low cost of PP and the results of this study, it is predicted that Cu2O/PP composites can be used in infant preparation (such as milk bottles) with low cost and good thermal stability in the near future.

Sign in / Sign up

Export Citation Format

Share Document