PL
 |
EN
Ograniczanie wyników
Czasopisma help
  1. 65 Materials Science Poland
  2. 26 Optica Applicata
  3. 13 Archives of Metallurgy and Materials
  4. 12 Elektronika : konstrukcje, technologie, zastosowania
  5. 9 International Letters of Chemistry, Physics and Astronomy
Więcej...
Autorzy help
  1. 8 Matysiak W.
  2. 8 Tański T.
  3. 7 Kaczmarek D.
  4. 6 Domaradzki J.
  5. 5 Gazicki-Lipman M.
Więcej...
Lata help
  1. 1 2024
  2. 4 2023
  3. 7 2022
  4. 5 2021
  5. 11 2020
Więcej...
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 232

Liczba wyników na stronie
first rewind previous Strona / 12 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  optical properties
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 12 next fast forward last
1
Content available remote Structural and optical properties of aluminium nitride thin films fabricated using pulsed laser deposition and dc magnetron sputtering on various substrates
Virt Ihor, Potera Piotr, Wisz Grzegorz, Dziedzic Andrzej, Cieniek Bogumił, Lopatynskyi Ivan, Frugynskyi Marian
Advances in Materials Science
|
2024
|
Vol. 24, nr 1(79)
5--16
EN
Aluminium nitride thin films were fabricated using pulsed laser deposition and DC magnetron sputtering. Different technological parameters and the effects of different substrates on the optical and structural parameters of AlN samples were studied. An X-ray diffraction study was performed for the layer deposited on the Si3N4 substrate. A high-energy electron diffraction study was also carried out for the layer deposited on a KCl substrate. Transmission spectra of layers on quartz, sapphire, and glass substrates were obtained. An evaluation of the optical band gap of the obtained layers was carried out (Eg form 3.81 to 5.81 eV) and the refractive index was calculated (2.58). The relative density of the film (N1TN-AlN sample) is 1.26 and was calculated using the Lorentz-Lorentz relationship. Layers of aluminium nitride show an amorphous character with a polycrystalline region. It was shown that the properties of AlN films strongly depend on the method, growth conditions, and substrate used.
2
Content available Optical characteristics of Portulaca grandiflora-doped Cellulose using the spray pyrolysis technique
Alaridhee Tahseen, Obeed Mohammed T., Malk Fatima H., Dhahi Baheya A.
Opto-Electronics Review
|
2023
|
Vol. 31, No. 3
art. no. e146553
EN
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%.
3
Content available Cost-effective titania layers over 100 nm thick : effect of annealing on the structural, morphological, and optical properties
Zięba Magdalena, Tyszkiewicz Cuma, Gondek Ewa, Wojtasik Katarzyna, Nizioł Jacek, Dorosz Dominik, Starzyk Bartłomiej, Szymczak Patryk, Pakieła Wojciech, Rogoziński Roman, Karasiński Paweł
Opto-Electronics Review
|
2023
|
Vol. 31, No. 4
art. no. e147913
EN
Titania dioxide (TiO₂) layers were synthesized via the acid-catalysed sol-gel route using titania (IV) ethoxide, and then annealed at temperatures varying in the range of 150-700 °C. The research concerned the effect of annealing temperature on the structure of TiO₂ layers, their surface morphology, and their optical properties. Further, X-ray diffractometry, and Raman spectroscopy were used to determine the structure of TiO₂ layers. Scanning electron and atomic force microscopy were used to study the surface morphology of TiO₂ layers. Transmittance, reflectance, absorption edge, and optical homogeneity were investigated by UV-VIS spectrophotometry, while the refractive index and thicknesses of TiO₂ layers were measured using a monochromatic ellipsometer. Chromatic dispersion characteristics of the complex refractive index were determined using spectroscopic ellipsometry. Structural studies have shown that the TiO₂ layers annealed at temperatures up to 300 °C are amorphous, while those annealed at temperatures exceeding 300 °C are polycrystalline containing only anatase nanocrystals with sizes increasing from 6 to 20 nm with the increase of the annealing temperature. Investigations on the surface morphology of TiO₂ layers have shown that the surface roughness increases with the increase in annealing temperature. Spectrophotometric investigations have shown that TiO₂ layers are homogeneous and the width of the indirect optical band gap varies with annealing temperature from 3.53 eV to 3.73 eV.
4
Content available Thermodynamic Phase Diagram and Phonon stability, Electronic and Optical Properties of FeVSb: A DFT study
Bagheri A., Boochani A., Masharian S. R., Jafarpour F. H.
Archives of Metallurgy and Materials
|
2023
|
Vol. 68, iss. 1
331--338
EN
Mechanical, electronic, thermodynamic phase diagram and optical properties of the FeVSb half-Heusler have been studied based on the density functional theory (DFT) framework. Studies have shown that this structure in the MgAgAs-type phase has static and dynamic mechanical stability with high thermodynamic phase consistency. Electronic calculations showed that this compound is a p-type semiconductor with an indirect energy gap of 0.39 eV. This compound’s optical response occurs in the infrared, visible regions, and at higher energies its dielectric sign is negative. The Plasmon oscillations have occurred in 20 eV, and its refraction index shifts to zero in 18 eV.
5
Content available remote Chemical synthesis by precipitation of zinc oxide for boimedical application
Medjber Farida Ait, Amokrane Rachida, Djafri Dihia, Belmouhoub Zaina, Bentaha Dyhia, Yefsah Said
Advances in Materials Science
|
2023
|
Vol. 23, nr 2(76)
77--87
EN
The objective of the study is the chemical synthesis of ZnO powders, from ZnCl2 and NaOH solutions according to an appropriate procedure. The powders (a) and (b) obtained underwent various characterizations such as: optical microscopy, SEM, UV, BET, IR, XRD and antimicrobial activity. The results showed the inhomogeneous distribution, the nanometric size, the absorbance at 353 and 346 nm and the specific surface of 25.701 and 30.534 cm2/g of the particles, the presence of all the characteristic bands of ZnO which was confirmed by XRD and very good bacterial sensitivity of the two ZnO powders.
6
Content available remote Wpływ promieniowania UV-VIS na właściwości optyczne i mechaniczne folii PLA/PHB
Malinowski Rafał, Stepczyńska Magdalena, Krasinskyi Volodymyr, Szymańska Lauren
Przemysł Chemiczny
|
2022
|
T. 101, nr 12
1082--1086
PL
Przedstawiono wyniki badań procesu przyśpieszonego starzenia folii otrzymanych z polilaktydu (PLA) i poli(kwasu hydroksymasłowego) (PHB), a także ich mieszanin. W procesie tym zastosowano wyłącznie promieniowanie UV-VIS. Określono wpływ tego promieniowania na właściwości optyczne i mechaniczne wytworzonych folii. Stwierdzono, że badane folie są podatne na działanie promieniowania UV-VIS, na co wskazywały na ogół pogorszone właściwości mechaniczne tych folii, a także wzrost ich zamglenia i w większości przypadków zmniejszenie ich transparentności. Stwierdzono również, że w celu zachowania w dłuższym okresie czasu odpowiednich właściwości badanych folii, konieczne jest stosowanie dodatkowych środków stabilizujących.
EN
Film samples made of polylactide (PLA), polyhydroxybutyrate (PHB) or their mixtures were exposed to UV-VIS radiation at 45°C for 130 h. The effect of the radiation on the optical and mech. properties of the obtained films was detd. The tested films were susceptible to degradation when exposed to UV-VIS radiation. Deteriorated mech. properties of the films, an increase in their haze and, in most cases, a decrease in transparency were obsd. In order to maintain the appropriate properties of the films in the long term, it is necessary to use addnl. stabilizing agents.
7
Content available remote Deposition and optical properties investigations of WO3 thin films for electrochromic device applications
Rybak Janusz, Marszalek Konstanty
Przegląd Elektrotechniczny
|
2022
|
R. 98, nr 9
251--254
EN
Tungsten oxide WO3 thin films are one of the most widely used layers with electrochromic properties. Various deposition methods are used to produce them, including magnetron sputtering. In this paper the authors present the construction of a Lesker high vacuum system for GLAD Magnetron Sputtering and results of optical properties investigations of WO3 thin films which can be used for multilayer electrochromic systems.
XX
Cienkie warstwy tlenku wolframu WO3 są jednymi z najszerzej stosowanych warstw o właściwościach elektrochromowych. Do ich wytwarzania stosowane są różne metody osadzania, w tym rozpylanie magnetronowe. W niniejszej pracy autorzy przedstawiają budowę wysokopróżniowego systemu firmy Lesker do rozpylania magnetronowego GLAD oraz wyniki badań właściwości optycznych cienkich warstw WO3, które mogą być stosowane w wielowarstwowych układach elektrochromowych.
8
Content available Optical properties of polyetherketoneketone based indirect dental restorations veneered with composite
Alsadon Omar, Wood Duncan, Patrick David, Durgesh Bangalore, Pollington Sarah
Polimery
|
2022
|
Vol. 67, nr 4
141--148
EN
In this study, the optical properties of indirect dental restorations based on polyetherketoneketone (PEKK), zirconia (YZ), and nickel-chromium (Ni-Cr) veneered with composite were compared. Based on the spectral reflectance, the CIE L*a*b* color coordinates, the color difference (ΔE), the opacity and the translucency parameter (TP) were determined using a spectrophotometer equipped with a D65 illuminant. The PEKK and Ni-Cr groups demonstrated similar CIE L*a*b* color values on white and black backgrounds. However, the zirconia group on a white backgrounds showed a slight shift in values towards red-yellow shades. The highest recorded ΔE values were 1.3 and 1.61 between PEKK and YZ groups, and Ni-Cr and YZ groups respectively. The opacity and translucency (TP) parameters were consistent with the spectral reflectance data, with the Ni-Cr and PEKK groups being completely opaque (100% and 0 TP). It has been shown that the use of the same indirect light-cured composite veneer with different substructure materials has no clinical effect on the esthetics of the final restoration.
PL
Porównano właściwości optyczne pośrednich uzupełnień protetycznych na bazie polieteroketonoketonu (PEKK), tlenku cyrkonu (YZ) i niklu-chromu (Ni-Cr) licowanych kompozytem. Na podstawie współczynnika odbicia spektralnego określono współrzędne koloru CIE L*a*b*, różnicę koloru (ΔE), nieprzezroczystość i parametr przezierności (TP). Współrzędne koloru grupy PEKK i Ni-Cr wykazywały podobne wartości koloru CIE L*a*b* na białym i czarnym tle. Natomiast w przypadku YZ na białym tle stwierdzono niewielkie przesunięcie wartości w kierunku odcieni czerwono-żółtych. Najwyższe odnotowane wartości ΔE wyniosły 1,3 i 1,61 odpowiednio dla grup PEKK i YZ oraz Ni-Cr i YZ. Parametry nieprzezroczystości i przezierności były zgodne z danymi spektralnego współczynnika odbicia, przy czym grupy Ni-Cr i PEKK były całkowicie nieprzezroczyste (100% i 0 TP). Wykazano, że zastosowanie tej samej pośredniej światłoutwardzalnej licówki kompozytowej z różnymi materiałami podbudowy nie ma klinicznego wpływu na estetykę ostatecznego uzupełnienia.
9
Content available Wpływ wygrzewania na właściwości sensorowe powłok TiOx wytworzonych metodą rozpylania magnetronowego
Kapuścik Paulina, Mańkowska Ewa, Wojcieszak Damian
Biuletyn Wojskowej Akademii Technicznej
|
2022
|
Vol. 71, nr 2
27--39
PL
W pracy przedstawiono wyniki badań wpływu temperatury wygrzewania na właściwości optyczne, a także morfologii powierzchni cienkich warstw niestechiometrycznych tlenków tytanu (TiO x). Zostały one powiązane z wynikami badań odpowiedzi sensorowej warstw na obecność H₂. Próbki wytworzono metodą rozpylania magnetronowego w atmosferze Ar:O₂ o małej zawartości tlenu (20% oraz 30%). im większa była ilość tlenu w mieszaninie gazowej podawanej do komory próżniowej, tym niższa szybkość osadzania powłok. Badania wykonane za pomocą profilometru optycznego wykazały, że grubość obu serii naniesionych warstw wynosiła odpowiednio 600 nm i 200 nm. Powłoki te następnie wygrzewano w powietrzu w temperaturze od 100°C do 800°C. w ramach badań określono również ich chropowatość. aby ocenić właściwości optyczne powłok, zmierzone zostały charakterystyki transmisji oraz odbicia światła, na podstawie których wyznaczono takie parametry jak współczynnik transmisji, położenie krawędzi optycznej absorpcji oraz szerokość optycznej przerwy energetycznej w funkcji temperatury wygrzewania warstw. Z kolei właściwości sensorowe powłok określono na podstawie zmian rezystancji w odpowiedzi na pobudzenie w postaci mieszaniny Ar:3,5%H₂. Stwierdzono, że stopień utlenienia warstw ma kluczowy wpływ nie tylko na szybkość odpowiedzi warstwy TiOx, lecz także na sam charakter tej odpowiedzi.
EN
This work describes the influence of the annealing temperature on the optical and surface properties of nonstoichiometric titanium oxide (TiOx ) thin films. The results were related to the investigation of the sensing response toward H₂ gas. The samples were prepared by the magnetron sputtering method using Ar:O₂ plasma with low oxygen content (20% and 30%). an increase in the amount of oxygen in the gas mixture supplied to the magnetron led to a decrease in the deposition rate. The thickness of the deposited thin films, determined by the use of an optical profiler, was found to be 600 nm and 200 nm, respectively. The coatings were then annealed in an ambient air atmosphere at a temperature in the range from 100°C to 800°C. additionally, the roughness of the coating surface was measured. To investigate the optical properties of the thin films, transmission and reflection spectra were measured, and parameters such as transmission coefficient, cutoff wavelength value, and optical band gap value were determined as functions of the annealing temperature. The sensing properties of the thin films were characterised on the basis of changes in a resistance value as a response to a mix of Ar:3.5% H₂. it was found that the oxidation of the thin films has a key influence not only on the response time of the TiOx thin films, but also on the character of the response.
10
Content available Właściwości elektryczne i optyczne cienkich warstw WOx wytwarzanych metodą rozpylania magnetronowego i analiza ich współczynnika doskonałości
Dybała Julia, Mazur Michał
Biuletyn Wojskowej Akademii Technicznej
|
2022
|
Vol. 71, nr 2
15--25
PL
W artykule przeanalizowano właściwości optyczne i elektryczne cienkich warstw tlenku wolframu. Jest to materiał często stosowany między innymi w inteligentnych oknach, lustrach antyparowych i czujnikach gazów. zbadano pięć serii cienkich warstw tlenku wolframu, które zostały wytworzone w procesach rozpylania magnetronowego w atmosferze mieszaniny gazu roboczego (ar) oraz reaktywnego (O2) o różnej zawartości tlenu, tj. od 5% do 15%. Każdy z procesów przeprowadzany był przy tej samej wartości ciśnienia, odległości target - podłoże oraz w tym samym czasie. Grubość cienkich warstw zmierzona za pomocą profilometru optycznego wynosiła około 160 nm. zauważono, że wraz ze zwiększaniem się udziału gazu reaktywnego w procesie próbki zmieniały barwę od metalicznej, przez ciemnogranatową, po błękitną, jednocześnie stając się coraz bardziej przezroczyste. Pomiary właściwości elektrycznych wykonane za pomocą sondy czteroostrzowej, a także właściwości optycznych przeprowadzone z użyciem spektrofotometru wykazały, że zwiększanie udziału tlenu w procesie powodowało wzrost średniej transmisji światła w zakresie widzialnych długości fal oraz rezystywności cienkich warstw. W artykule przeanalizowano również współczynniki Figure of Merit określające jakość badanej próbki. Największą wartość współczynnika doskonałości otrzymano dla cienkiej warstwy tlenku wolframu, odznaczającej się stosunkowo dużą średnią transmisją światła w zakresie widzialnym przy niskiej wartości rezystywności. Przeprowadzone badania wykazały, że atmosfera gazowa podczas procesu rozpylania magnetronowego istotnie wpływa na właściwości optyczne i elektryczne cienkich warstw tlenku wolframu, co stwarza możliwość projektowania cienkowarstwowych powłok przeznaczonych do stosowania w transparentnej elektronice.
EN
In this article, optical and electrical properties of tungsten oxide thin films, prepared by magnetron sputtering in the atmosphere of various oxygen content, were analysed. Tungsten oxide is a material, which is widely used in modern applications such as smart windows, antisteam mirrors, and gas sensors. Five sets of tungsten oxide thin films were deposited by magnetron sputtering in the mixed argon-oxygen atmosphere composed of various content of reactive gas, i.e., from 5% to 15%. In each case, other deposition process parameters were the same. The thickness of the thin films was ca. 160 nm and it was measured with the optical profilometer. it was noticed that along with the increase in the proportion of reactive gas in the process, thin film samples changed their colour from metallic, through navy blue to blue and simultaneously they became increasingly transparent. Measurements of electrical properties, made using the four-point probe and optical properties, performed with the aid of a spectrophotometer showed that increasing the proportion of oxygen in the process increased the average transmission in the visible wavelength range and the resistivity of the prepared WOx thin films. in the article, the Figure of Merit (FoM) coefficients are also presented, which determine the quality of the thin film samples. it was shown that the highest value of the FoM was observed for WOx thin film characterised by a relatively high average transmission in the visible wavelength range and low value of resistivity. The performed measurements showed that the gas atmosphere during magnetron sputtering process leads to the tailoring of the optical and electrical properties of tungsten oxide thin films, which in turn makes it possible to design and apply such thin film coatings in transparent electronics.
11
Content available Microstructural Studies of Ag/TiO2 Thin Film; Effect of Annealing Temperature
Kamrosni Abdul Razak, Dewi Suryani Che Halin, Azliza Azani, Mustafa A.B.A. Mohd, Anuar M.S. Mohd Arif, Norsuria Mahmed, Chobpattana Varistha, Kaczmarek L., Jeż Bartłomiej, Nabiałek Marcin
Archives of Metallurgy and Materials
|
2022
|
Vol. 67, iss. 1
241--245
EN
Microstructures are an important link between materials processing and performance, and microstructure control is essential for any materials processing route where the microstructure plays a major role in determining the properties. In this work, silverdoped titanium dioxide (Ag/TiO2) thin film was prepared by the sol-gel method through the hydrolysis of titanium tetra-isopropoxide and silver nitrate solution. The sol was spin coated on ITO glass substrate to get uniform film followed by annealing process for 2 hours. The obtained films were annealed at different annealing temperatures in the range of 300°C-600°C in order to observe the effect on crystalline state, microstructures and optical properties of Ag/TiO2 thin film. The thin films were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectrophotometry. It is clearly seen, when the annealing temperature increases to 500°C, a peak at 2θ = 25.30° can be seen which refers to the structure of TiO2 tetragonal anatase. The structure of Ag/TiO2 thin film become denser, linked together, porous and uniformly distributed on the surface and displays the highest cut-off wavelength value which is 396 nm with the lowest band gap value, which is 3.10 eV.
12
Content available Effect of Reaction Time and Heat Treatment in the Production of Hydroxyapatite by Hydrothermal Synthesis
Kati Nida, Ozan Sermin, Yildiz Tülay, Arslan Mehmet
Archives of Metallurgy and Materials
|
2022
|
Vol. 67, iss. 4
1427--1434
EN
In the present work, Hydroxyapatite synthesis was carried out using hydrothermal method with calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) and fosfor pentaoksit (P2O5) as precursors. For the hydrothermal method, constant reaction temperature (180°C) and different reaction times (6 hours, 12 hours, 18 hours and 24 hours) were determined. The samples produced were divided into two groups. Four samples were not heat treatment; four samples were heat treatment at 700°C for 1 hour. The obtained products were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) techniques, X-ray diffraction (XRD) and UV-Vis spectrometer. SEM photos showed that the Hydroxyapatite powders produced are in the form of the agglomerate. According to EDS results, Hydroxyapatite samples are of high purity. XRD’s findings confirm that the diffraction peaks correspond to the pure phase of Hydroxyapatite. A general decrease was observed in the energy band gap of the samples with increasing hydrothermal reaction time.
13
Content available Saturation in the principal (excited) channel of four-level medium as an effective two-level configuration
Addasi Jihad S.
Optica Applicata
|
2021
|
Vol. 51, nr 2
235--244
EN
Saturation of complex molecules affects the nonlinear processes occurring in the medium. The medium can be described by two-, three-, and four-level configurations. The principal singlet-singlet and excited triplet-triplet channels of a four-level, N-type, configuration were used to study a nonlinear medium, which was excited by radiation with two frequencies. Under weak population of energy levels in the triplet-triplet channel (a small ratio of the total probability of spontaneous and irradiate transitions for both channels p23/p31), the principal (singlet-singlet) channel is similar to a two-level configuration. At the same time, the effective population of the energy levels in the triplet-triplet channel (the ratio p23/p31 is large and the radiation intensity in the principal channel is high) makes the excited (triplet-triplet) channel coincide with the two-level configuration. The saturation intensity of radiation in principal (excited) channel, as effective two-level configuration, and nonlinear processes in this channel can be controlled by external radiation acting on excited (principal) channel. Finally, the average excitation of molecules into the energy levels in the triplet-triplet channel (ratio p23/p31 ≈ 1) makes the four-level configuration similar to the three-level configuration with effective level as a result of combination between second singlet level S2 and first triplet level T1.
14
Content available Ellipsometry based spectroscopic complex for rapid assessment of the Bi2Te3-xSexthin films composition
Kovalev Vladimir, Uvaysov Saygid, Bogucki Marcin
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
|
2021
|
T. 11, nr 4
67--74
EN
A comparative analysis of the current state and development of spectral ellipsometry (SE) is carried out, the main limitations typical of popular configurations of measuring devices are determined. An original technical solution is proposed that allows one to create a two-source SE that implements the ellipsometry method with switching orthogonal polarization states. The measuring setup provides high precision of measurements of ellipsometric parameters Ψand Δin the spectral range of 270–2200 nm and the speed determined by the characteristics of pulsed sources with a simple ellipsometer design.As objects for experimental researches, confirming the efficiency and high precision qualities of the fabricated SE, we used a GaAs/ZnS-quarter-wave device for a CO2laser and SiO2on Si calibration plates. The optical properties of Bi2Te3-xSexfilms were investigated in the range of 270–1000 nm using a multi-angle SE. It was shown that the optical properties of Bi2Te3-xSexfilms monotonically change depending on the ratio of selenium and tellurium.
PL
W artykule najpierw dokonano analizy porównawczej obecnego stanu rozwoju elipsometriispektroskopowej oraz określono główne ograniczenia typowe dla popularnych konfiguracji urządzeń pomiarowych. Zaproponowano oryginalne rozwiązanie techniczne pozwalające na stworzenie dwuźródłowego elipsometu spektroskopowego z przełączaniem ortogonalnych stanów polaryzacji. Układ pomiarowy zapewnia wysoką precyzję pomiarów parametrów elipsometrycznych Ψ i Δ w zakresie spektralnym 270–2200 nm i prędkości wyznaczonej przez charakterystyki źródeł impulsowych przy prostej konstrukcji elipsometru. Jako obiekty do badań eksperymentalnych potwierdzających wydajność i wysoką precyzję proponowanego elipsometu spektroskopowego, wykorzystano ćwierćfalowy przyrząd GaAs/ZnS dla lasera CO2oraz płytki kalibracyjne SiO2na krzemie. Właściwości optyczne warstw Bi2Te3-xSexzbadano w zakresie 270–1000 nm przy użyciu wielokątowego elipsometu spektroskopowego. Wykazano, że właściwości optyczne cienkich warstw Bi2Te3-xSexzmieniają się monotonicznie w zależności od stosunku zawartości selenu i telluru.
15
Wpływ wygrzewania na właściwości cienkich warstw tlenku wanadu
Kiełczawa Szymon, Lubańska Aneta, Mazur Michał, Wiatrowski Artur
Elektronika : konstrukcje, technologie, zastosowania
|
2021
|
Vol. 62, nr 4
18--20
PL
W pracy przedstawiono wyniki badań wpływu wygrzewania na właściwości cienkich warstw tlenków wanadu (VxOy) wytworzonych metodą rozpylania magnetronowego. Cienkie warstwy bezpośrednio po naniesieniu oraz po wygrzewaniu w 200°C zostały poddane badaniom strukturalnym, optycznym oraz elektrycznym. Współczynnik transmisji cienkich warstw po wygrzewaniu zmniejszył się z około 70% na 50%. Z kolei rezystywność cienkiej warstwy tlenku wanadu po naniesieniu wynosiła 3.4·10⁴ Wcm, natomiast powłoki po wygrzaniu 1.6·10² Wcm. Badania współczynnika Seebecka wykazały, że wraz ze wzrostem różnicy temperatury między kontaktami elektrycznymi następuje zmiana typu przewodnictwa z dziurowego na elektronowy, a wygrzanie warstwy spowodowało uwydatnienie elektronowego typu przewodnictwa.
EN
This paper provides the research results of the influence of the post-process annealing of vanadium oxide (VxOy) thin films deposited by magnetron sputtering on their properties. As-deposited and annealed at 200°C thin films were analysed by means of their structural, optical and electrical properties. The transmission of thin films after annealing decreased from ca. 70% to 50%. In turn, the resistivity of the vanadium oxide thin films was equal to 3,4·10⁴ Wcm, while after post-process annealing it decreased to 1.6·10² Wcm. The studies of the Seebeck coefficient showed that with the increase of the temperature difference between the electrical contacts, the type of conductivity changes from hole to electron type, while the annealing of the layer enhances the electronic type of conductivity.
16
Content available Characterization of morphology and optical properties of SnO₂ nanowires prepared by electrospinning
Tański Tomasz, Smok Weronika, Matysiak Wiktor
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2021
|
Vol. 69, nr 5
art. no. e137507
EN
The growing interest in one-dimensional tin oxide-based nanomaterials boosts research on both high-quality nanomaterials as well as production methods. This is due to the fact that they present unique electrical and optical properties that enable their application in various (opto)electronic devices. Thus, the aim of the paper was to produce ceramic SnO₂ nanowires using electrospinning with the calcination method, and to investigate the influence of the calcination temperature on the morphology, structure and optical properties of the obtained material. A scanning electron microscope (SEM) and Fourier-transform infrared spectroscopy (FTIR) were used to examine the morphology and chemical structure of obtained nanomaterials. The optical properties of manufactured one-dimensional nanostructures were investigated using UV-Vis spectroscopy. Moreover, based on the UV-Vis spectra, the energy band gap of the prepared nanowires was determined. The analysis of the morphology of the obtained nanowires showed that both the concentration of the precursor in the spinning solution and the calcination temperature have a significant impact on the diameter of the nanowires and, consequently, on their optical properties.
17
Content available The Ru Impurity Effect on Electronic, Optical and Thermoelectric Properties of MoS2 Nano-Sheet: a DFT Study
Dezfuli Firouzeh Motamad, Boochani Arash, Parhizgar Sara Sadat, Darabi Elham
Archives of Metallurgy and Materials
|
2021
|
Vol. 66, iss. 2
461--468
EN
The electronic, optical and thermoelectric properties of MoS2 nano-sheet in presence of the ru impurity have been calculated by density functional theory framework with generalized gradient approximation. The MoRuS2 nano-sheet electronic structure was changed to the n-type semiconductor by 1.3 eV energy gap. The optical coefficients were shown that the loosing optical energy occurred in the higher ultraviolet region, so this compound is a promising candidate for optical sensing in the infrared and visible range. The thermoelectric behaviors were implied to the good merit parameter in the 100K range and room temperatures and also has high amount of power factor in 600K which made it for power generators applications.
18
Content available Electronic, optical and non-linear optical properties of an N-cyclohexylacrylamide molecule : a potential optoelectronic agent
Tanış E., Çankaya N.
Opto-Electronics Review
|
2020
|
Vol. 28, No. 4
191--196
EN
In this article, synthesis, electronic and optical properties of an N-cyclohexyl-acrylamide (NCA) molecule are described based on different solvent environments and supported by theoretical calculations. Theoretical calculations have been carried out using a density function theory (DFT). Temperature dependence of the sample electrical resistance has been obtained by a four-point probe technique. Experimental and semitheoretical parameters such as optical density, transmittance, optical band gap, refractive index of the NCA for different solvents were obtained. Both optical values and electrical resistance values have shown that NCA is a semiconductor material. The values of HOMO and LUMO energy levels of the headline molecule indicate that it can be used as the electron transfer material in OLEDs. All results obtained confirm that the NCA is a candidate molecule for OLED and optoelectronic applications.
19
Content available remote Structural and optical properties of ZnO thin film prepared by sol-gel spin coating
Balakrishnan G., Sinha Vivek, Peethala Yogesh Palai, Kumar Manoj, Nimal R. J. Golden Renjith, Hussain J. Hameed, Batoo Khalid Mujasam, Raslan Emad H.
Materials Science Poland
|
2020
|
Vol. 38, No. 1
17--22
EN
Zinc oxide (ZnO) thin films were deposited on Si (1 0 0) and glass substrates by sol-gel spin coating technique. Zinc acetate dihydrate, monoethanolamine and isopropanol were used as the sources for precursor solution and the resulting gel was used for the preparation of ZnO thin films. The films were annealed at different temperatures (100 °C to 500 °C) and the effect of annealing on the structural and optical properties was investigated. X-ray diffraction (XRD) and UV-Vis spectroscopy were used for the analysis of the films. The XRD results indicated the polycrystalline hexagonal structure of the ZnO films with (0 0 2) orientation. The optical properties of the films were studied using UV-Vis spectrophotometer in the wavelength range of 190 – 1100 nm. The optical characterization of the ZnO thin films showed the high transmittance of ~90 % for the films annealed at 400 °C. The films showed the absorbance ~360 – 390 nm and bandgap values of 3.40 – 3.10 eV, depending on the annealing temperature of the films.
20
Content available remote Sputtering pressure influenced structural, electrical and optical properties of RF magnetron sputtered MoO3 films
Subbarayudu S., Reddy K. Venkata Subba, Uthanna S.
Materials Science Poland
|
2020
|
Vol. 38, No. 1
41--47
EN
MoO3 films were deposited by RF magnetron sputtering technique on glass and silicon substrates held at 473 K by sputtering of metallic molybdenum target at an oxygen partial pressure of 4 x 10-2 Pa and at different sputtering pressures in the range of 2 Pa to 6 Pa. The influence of sputtering pressure on the structure and surface morphology, electrical and optical properties of the MoO3 thin films was studied. X-ray diffraction studies suggest that the films deposited at a sputtering pressure of 2 Pa were polycrystalline in nature with mixed phase of α- and β-phase MoO3, while those formed at sputtering pressure of 4 Pa and above were of a-phase MoO3. Scanning electron micrographs showed a decrement in the size of the particles and their shapes changed from needle like structure to dense films with the increase of sputtering pressure. Fourier transform infrared spectroscopic studies confirmed the presence of characteristic vibration modes of Mo=O, Mo–O and Mo–O–Mo related to MoO3. Electrical resistivity of the MoO3 films decreased from 6.0 x 104 Ωcm to 2 X 104 Ω∙cm with an increase of sputtering pressure from 2 Pa to 6 Pa, respectively. Optical band gap of the films decreased from 3.12 eV to 2.86 eV with the increase of sputtering pressure from 2 Pa to 6 Pa, respectively.
first rewind previous Strona / 12 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.