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Wyświetlanie 1-15 z 22
Tytuł:
Effect of substrate temperature on the optical and structural properties of CdS nano particles
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS
Autorzy:
Qassim, Barzan Kh.
Uonis, Mohammad M.
Khaleel, Erada A.
Powiązania:
https://bibliotekanauki.pl/articles/41152375.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
CdS thin films
optical properties of CdS
chemical spray pyrolysis
CdS nanoparticles
cienkie warstwy CdS
właściwości optyczne CdS
chemiczna piroliza natryskowa
nanocząstki CdS
Opis:
Thin films of CdS have been deposited on glass substrates using the chemical spray pyrolysis method at different substrate temperatures of 100°C, 150°C, 200°C, and 250°C to investigate the optimum temperature to prepare CdS particles with nano dimensions. The CdS thin film was examined using SEM, X-ray spectrum analysis, and UV-visible spectrophotometry. The SEM images and X-ray spectra were used to estimate the structural features and grain size of the films. The optical properties and optical constants also varied clearly with temperature. In addition, the energy gap changed with temperature from 2.1 eV to 2.55 eV.
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS Cienkie warstwy CdS zostały osadzone na szklanych podłożach metodą chemicznej pirolizy natryskowej w temperaturach podłoża wynoszących 100°C, 150°C, 200°C i 250°C w celu określenia optymalnej temperatury do przygotowania cząstek CdS o wymiarach nano. Tak przygotowane próbki zostały zbadane za pomocą SEM i spektrofotometrii UV-VIS, przeprowadzono także analizę widma rentgenowskiego. Obrazy SEM i widma rentgenowskie zostały wykorzystane do oszacowania cech strukturalnych i wielkości ziarna warstw. Właściwości optyczne i stałe optyczne zmieniały się wyraźnie wraz ze zmianą temperatury. Przerwa energetyczna wynosiła w zależności od temperatury od 2,1 eV do 2,55 eV.
Źródło:
Ochrona przed Korozją; 2023, 11; 354-357
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorine-Doped SnO2 Thin Films in Solar Cell Applications. Morphological, Optical and Electrical Properties
Autorzy:
Lisnic, Petru
Hrostea, Laura
Leontie, Liviu
Girtan, Mihaela
Powiązania:
https://bibliotekanauki.pl/articles/27313873.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
fluorine tin oxide
FTO
thin films
spray pyrolysis
solar cells
Opis:
This study examines the optimal parameters for obtaining fluorine-doped SnO2 (FTO) films with promising potential for photovoltaic applications. Due to its properties, tin oxide is used in a wide range of technologies, among which the manufacture of solar cells is one of the most important. Being doped with fluorine, tin dioxide becomes a good transparent and conductive electrode, suitable for solar cell applications. The chemical stability and low cost of the doped SnO2 makes it an advantageous alternative to tin-doped indium oxide (ITO). Among the most important characteristics of FTO thin films are high photoconductivity under sunlight irradiation and strong UV absorption. The SnO2 compound, doped with fluorine, exhibits a considerable chemical and physical stability, good electrical conductivity and high transmission (over 85%) in the visible range. The spray pyrolysis technique is the most preferable and efficient deposition method of fluorine-doped SnO2 thin films. This work aims to identify the optimal parameters for the spray pyrolysis of SnO2:F films and to analyze the morphology, transparency and strength of as obtained films in relation to the doping amount in the precursor solution, spraying distance and film thickness.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 483--490
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical characteristics of Portulaca grandiflora-doped Cellulose using the spray pyrolysis technique
Autorzy:
Alaridhee, Tahseen
Obeed, Mohammed T.
Malk, Fatima H.
Dhahi, Baheya A.
Powiązania:
https://bibliotekanauki.pl/articles/27315701.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
green materials
optical properties
natural dye
biopolymer
spray pyrolysis technique
Opis:
Thin films were prepared based on cellulose polymer doped with different ratios of natural dye derived from Portulaca grandiflora concentrations. The polymer and natural dye were extracted from eco-friendly materials - the cell walls of millet husks and Portulaca grandiflora, respectively. The spray pyrolysis technique was applied to prepare thin film samples to control the film morphology and reduce the roughness of the surface. Optical microscope and Fourier transform infrared were used to analyse structural, morphological, and functional groups for all samples, respectively. The peak absorbance, extinction coefficient, optical bandgap, Urbach energy, and optical conductivity for the thin films were determined using ultraviolet-visible spectroscopy. The results show an enhancement in the optical characteristics when the natural cellulose is doped with a dye. Doping cellulose with 5% P. grandiflora has led to a considerable reduction in the energy bandgap (to 1.95 eV), compared to the sample doped with 1%.
Źródło:
Opto-Electronics Review; 2023, 31, 3; art. no. e146553
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of W Composite Powder with La2O3-Y2O3 Nano-Dispersoids by Ultrasonic Spray Pyrolysis
Autorzy:
Heo, Youn Ji
Lee, Eui Seon
Kim, Jeong Hyun
Lee, Young-In
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/2174558.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
W composite powder
La2O3-Y2O3 dispersion
ultrasonic spray pyrolysis
polymeric additive solution method
Opis:
An optimum route to synthesis the W-based composite powders with homogeneous dispersion of oxide nanoparticles was investigated. The La2O3 dispersed W powder was synthesized by ultrasonic spray pyrolysis using ammonium metatungstate hydrate and lanthanum nitrate. The dispersion of Y2O3 nanoparticles in W-La2O3 powder was carried out by a polymer addition solution method using yttrium nitrate. XPS and Tem analyses for the composite powder showed that the nano-sized La2O3 and Y2O3 particles were well distributed in W powder. This study suggests that the combination processing of ultrasonic spray pyrolysis and polymeric additive solution is a promising way to synthesis W-based composite powders.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1507--1510
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Y2O3-Dispersed W Powders Prepared by Ultrasonic Spray Pyrolysis and Polymer Solution Route
Autorzy:
Jo, Hyeonhui
Lee, Young-In
Suk, Myung-Jin
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/2049335.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tungsten
Y2O3 dispersion
ultrasonic spray pyrolysis
wet chemical route
Opis:
The nano-sized Y2O3 dispersed W composite powder is prepared by ultrasonic spray pyrolysis of a tungsten precursor using ammonium metatungstate hydrate and a polymer addition solution method using Y-nitrate. XRD analysis for calcined powder showed the formation of WO2 phase by partial oxidation of W powder during calcination in air. The TEM and phase analysis for further hydrogen reduction of calcined powder mixture exhibited that the W powder with a uniform distribution of Y2O3 nanoparticles can be successfully produced. These results indicate that the wet chemical method combined with spray pyrolysis and polymer solution is a promising way to synthesis the W-based composites with homogeneous dispersion of fine oxide particles.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 799-802
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma-Enhanced Atmospheric Pressure Spray Pyrolysis System for the Production of Few Walls Carbon Nanotubes
Autorzy:
Soto, Gerardo
Ramírez-Hernández, Felipe
Muñoz-Muñoz, Franklin
Covarrubias, Cristian
Powiązania:
https://bibliotekanauki.pl/articles/1162427.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
few-walls carbon nanotubes
plasma enhanced
spray pyrolysis
Opis:
Spray pyrolysis is a recognized technique for the preparation of multi-walled Carbon Nano-Tubes (CNTs). Likewise, gas-phase plasma synthesis has the best potential to produce nanoparticles with narrow sized distribution in short times. Here we present a combination of both concepts to design an atmospheric-pressure plasma reactor in a configuration which can be scaled for massive production of few-walls CNTs. This hybrid setup uses a pneumatic nebulizer which produces an aerosol from a solution of toluene (the carbon source) in the presence of ferrocene (the catalyst). The mist goes toward the plasma zone, which is generated by a DC-soldering torch. The plasma effect is to reduce the droplet size of the nebulizer. By this mean the agglomeration of Fe nanoparticles is reduced and consequently, the number of walls and diameter of CNTs are decreased.
Źródło:
World Scientific News; 2018, 111; 64-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urbach energy and dispersion parameters of CdS chemically deposited thin films on the effect of thickness
Autorzy:
Hadi, Ahmed Hussin
Powiązania:
https://bibliotekanauki.pl/articles/1177946.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS thin film
Dispersion parameters
Urbach energy
chemical spray pyrolysis
Opis:
Optical transmittance spectra of CdS thin films were recorded from UV-Visible spectrophotometer in the range 380-900 nm. The films were prepared by chemical spray pyrolysis by spraying an aqueous solution of cadmium chloride (CdCl2) and thiourea [(NH2)2CS] with de-ionized water. UV-Visible spectrophotometer used to recording the transmittance spectra in the range of 380-900 nm. The transmittance decreased with the increasing of CdS film thickness, while the reflectance increases. The energy gap decreased with the increasing of film thickness, while Urbach energy increased. Dispersion parameters such as; Ed, Eo, ε∞, n(0), So, λo, M-1, and M-3 are studied.
Źródło:
World Scientific News; 2018, 97; 241-249
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of (SnO2)1-x(ZnO)x Thin Films Prepared by Spray Paralysis Technique
Autorzy:
Nahida, Bukhееt Hasan
Zahra'a, Adеl Jawad
Mohammed, Ahmed Mohammed
Huda, Bukhееt Hasan
Powiązania:
https://bibliotekanauki.pl/articles/1179187.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
optical propеrtiеs
spray pyrolysis tеchniquе
thin films
еnеrgy gap
Opis:
Thе study of thе optical propеrtiеs is usеful in thе task of dеtеrmining thе naturе of thе practical application that can bе usеd to rеcord film matеrial. Thе optical propеrtiеs of thе mixеd (SnO2)1−x(ZnO)x thin films dеpositеd on a glass substratе by spray pyrolysis tеchniquе (SPT) at a substratе tеmpеraturе 400 °C havе bееn invеstigatеd by thе transmission spеctra at room tеmpеraturе wеrе mеasurеd in thе rangе from 300 to 1100 nm.Thе optical study rеvеalеd that thе films wеrе highly absorbеd with a dirеct typе of transition. Also thе dirеct еnеrgy gap was obsеrvеd to incrеasе with incrеasing of ZnO Vol.%
Źródło:
World Scientific News; 2017, 83; 182-193
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and optical properties of nanocrystalline CdS films prepared by spray pyrolysis
Autorzy:
Aljarrah, Radhyah M. S.
Aljobory, Adnan H.
Powiązania:
https://bibliotekanauki.pl/articles/1179009.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cadmium Sulphide
CdS films
spray pyrolysis
Opis:
Cadmium Sulphide (CdS) thin films are produced using spray pyrolysis deposition technique. Films are annealed in air at 400, 500, and 600 K of 1 h. It characterized by X-Ray Diffraction (XRD), Atomic Force Microscope (AFM) and optical properties of CdS. XRD shows that these films are polycrystalline in nature with cubic and hexagonal crystalline structure. The crystallite size, microstrain, and dislocation density were measured. AFM shows that the total substrate surface is finely covered with uniformly distributed spherical shaped grains. Optical transmittance was shown that direct transition with band gap energy was decreased between 2.44 to 2.27 eV with annealing.
Źródło:
World Scientific News; 2017, 87; 175-190
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Single Crystalline Titanium Oxide and Sodium Titanate Nanorods via Salt-Assisted Ultrasonic Spray Pyrolysis
Autorzy:
Hwangbo, Y.
Yoo, J.-H.
Lee, Y.-I.
Powiązania:
https://bibliotekanauki.pl/articles/352337.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiO2
nanorods
salt
Ultrasonic Spray Pyrolysis
optical properties
Opis:
The simple and continuous synthesis of single crystalline anatase titanium dioxide and sodium titanate nanorods by a saltassisted ultrasonic spray pyrolysis method is demonstrated. This method does not require expensive precursors, long reaction time, and physical templates or surfactant. In addition, its continuous nature makes it a suitable method for the large-scale preparation. Moreover, the effect of a salt concentration in a starting solution on material properties, including morphology and phase of the synthesized products was systematically investigated. The synthesized nanorods had one-dimensionality, a single crystalline and the average diameter of 12.3 nm with dual phases of titanium dioxide and sodium titanate by FE-SEM, XRD, HR-TEM as well as FFT-converted SAED pattern analysis.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1411-1414
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of Cu alloy on auxiliary and invisible options of splash kept CdS slims
Autorzy:
Kadhim, Mohammed A.
Powiązania:
https://bibliotekanauki.pl/articles/1188099.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
spray pyrolysis
optical properties
Cu concentration
Opis:
Cadmium Sulfide and copper alloyed Cd1-xS Cux slims have been set up by the spray pyrolysis technique. The optical gap crevices at unadulterated and doped Cadmium Sulfide were observed to be shifted from (2.34 to 2.45) eV with increment x from (0 to 0.1). The X-beam diffraction (XRD) investigation uncovered that slims were polycrystalline and showed two phases cubic and hexagonal structure with increasing the hexagonal phase with increment Cu ratio.
Źródło:
World Scientific News; 2016, 56; 217-228
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Co Doping on Structural and Optical Properties of NiO Thin Films Prepared By Chemical Spray Pyrolysis Method
Autorzy:
Bakr, N. A.
Salman, S. A.
Shano, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/412102.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
NiO thin films
Co Doping
Chemical Spray Pyrolysis
Optical Properties
Structural Properties
Opis:
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.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 41; 15-30
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of ZnO/p-Si Heterojunction Solar Cell
Autorzy:
Habubi, Nadir F.
Mousa, Abdulazeez O.
Powiązania:
https://bibliotekanauki.pl/articles/1193961.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
chemical spray pyrolysis
heterojunction solar cell
n-ZnO/p-Si
Opis:
Zinc oxide thin films was deposited by chemical spray pyrolysis (CSP) at 400 °C substrate temperature and different thickness (60, 80, and 100) nm on the texturized p-Si wafer to fabricate ZnO/p-Si heterojunction solar cell. Structural, optical, electrical and photovoltaic properties are investigated for the samples. XRD analysis reveals that all the as deposited ZnO films show polycrystalline structure, without any change due to increase of thickness. Average diameter calculated from AFM images shows an increase in its value with increasing thickness, ranging from 59.82-95.7 nm. The optical reflections for samples are measured using UV-Vis spectrophotometer. Photoluminescence (PL) spectra of (CSP) grown ZnO/p-Si with different thickness were used to study the energy gap. The electrical properties of heterojunction were obtained by I-V (dark and illuminated) and C-V measurement. I-V characteristic of the ZnO/p-Si heterojunction shows good rectifying behavior under dark condition. The ideality factor and the saturation current density was calculated. Under illuminated the photovoltaic measurements (open-circuit voltage (Voc), short-circuit current density (JSC), fill factor (FF), and quantum efficiencies are calculated for all samples. The built- in potential (Vbi), carrier concentration and depletion width are determined under different thickness from C-V measurement.
Źródło:
World Scientific News; 2015, 18; 78-92
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Light Conversion Efficiency Of Dye-Sensitized Solar Cell By Dispersing Submicron-Sized Granules Into The Nano-Sized TiO2 Layer
Poprawa efektywności konwersji światła ogniw słonecznych uczulonych barwnikiem poprzez rozproszenie submikronowych granulek w warstwie nanocząstek TiO2
Autorzy:
Song, S. A.
Lim, M. J.
Jung, K. Y.
So, W.-W.
Moon, S.-J.
Powiązania:
https://bibliotekanauki.pl/articles/353347.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titania nanoparticles
granules
dye-sensitized solar cell
light scattering
spray pyrolysis
nanocząsteczki tytanu
granulat
uczulone barwnikiem ogniwa słoneczne
rozpraszanie światła
Opis:
In this work, TiO2 nanoparticles and submicron-sized granules were synthesized by a hydrothermal method and spray pyrolysis, respectively. Submicron-sized granules were dispersed into the nano-sized TiO2 layer to improve the light conversion efficiency. Granules showed better light scattering, but lower in terms of the dye-loading quantity and recombination resistance compared with nanoparticles. Consequently, the nano-sized TiO2 layer had higher cell efficiency than the granulized TiO2 layer. When dispersed granules into the nanoparticle layer, the light scattering was enhanced without the loss of dye-loading quantities. The dispersion of granulized TiO2 led to increase the cell efficiency up to 6.51%, which was about 5.2 % higher than that of the electrode consisting of only TiO2 nanoparticles. Finally, the optimal hydrothermal temperature and dispersing quantity of granules were found to be 200°C and 20 wt%, respectively.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1467-1471
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heat Treatment on the Optical Properties of Cobalt Doped Stannic Oxide
Autorzy:
Hasan, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/411548.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
thin films
chemical spray pyrolysis
dilute magnetic semiconductor
stannic oxide
doping
Opis:
This study investigates The effect of annealing on The optical properties of (SnO2:Co) films prepared by spray pyrolysis (SP) technique at a glass substrate temperature (Ts = 773 K). The absorbance and transmittance spectra have been recorded in order to calculate the optical constant and the optical band gap energy of the films. It was found that the annealing affects all the parameters under investigations.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 9; 59-70
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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