Wyniki wyszukiwania - BazTech

1

Time-Resolved Sensitivity of a Cadmium-Doped Copper Oxide Thin Film as a Chlorine Gas Detector

Alotibi Turki, Shirbeeny Waleed, Alshahrie Ahmed, Aida Mohammed, Iqbal Jawid

Advances in Science and Technology. Research Journal

|

2024

|

Vol. 18, no 2

365--373

EN

Due to its strong affinity for chlorine gas, Cd can potentially form CdCl2. Cd-doped CuO thin films are sensitive to chlorine gas, as careful inclusion of Cd in the CuO crystal structure modifies the energy gap depending on the dopant concentration. We employed spray pyrolysis to deposit Cd-doped CuO on FTO (Fluorine Tin Oxide) while heating the substrate to 500 oC. The XRD (X-ray Diffraction) analysis revealed that Cd was interstitially incorporated in the CuO lattice structure, as verified by SEM (Scanning Electron Microscopy imaging). The photoluminescence study demonstrated that increasing the Cd concentration in CuO resulted in higher emission intensity, providing valuable insights into Cu2+ and O2- energy levels. Exposing a Cd-doped CuO thin film to chlorine gas modifies the bandgap, depending on the Cd concentration. The fluctuation in the bandgap energy of copper oxide doped with cadmium indicates the chlorine gas concentration nearby. Time-resolved measurements for the I-V characteristics of the thin film revealed considerable current variation during the exposure to chlorine gas.

2

Fluorine-Doped SnO2 Thin Films in Solar Cell Applications. Morphological, Optical and Electrical Properties

Lisnic Petru, Hrostea Laura, Leontie Liviu, Girtan Mihaela

Archives of Metallurgy and Materials

|

2023

|

Vol. 68, iss. 2

483--490

EN

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.

3

Effect of temperature on the properties of nickel sulfide films performed by spray pyrolysis technique

Gahtar A., Benramache S., Zaouche C., Boukacham A., Sayah A.

Advances in Materials Science

|

2020

|

Vol. 20, nr 3(65)

36--51

EN

In this work, we have prepared new materials of the nickel sulfide thin films by using the spray pyrolysis technique for promising co-catalyst to improve the photocatalytic performance or superconductivity. The effect of deposition temperature (523, 573 and 623 K) on structural, optical and electrical properties was investigated. The XRD diffraction shows that the prepared nickel sulfide at 523, 573 and 623 K having an orthorhombic, hexagonal and hexagonal structure, which were Ni3S2, Ni17S18 and NiS2, respectively. The minimum value of crystallite size (45,9 nm) was measured of deposited film at 573K. The thin films prepared at 523 and 573 K have an average transmittance is about 20 %. The prepared Ni1S2 thin film at T=623 K has the lowest calculated optical band gap and Urbach energy. The Ni1S2 thin film also has the best calculated of the refractive index and the extinction coefficient. The FTIR spectrums of the nickel sulfide have various bands such as Ni-S, C-H, O-H, N–H and C-S. The maximum electrical conductivity is 4,29x105 (Ω.cm)-1 was obtained at 573K of the Ni17S18. The nickel sulfide thin films sprayed at 573K have good structural, optical and electrical properties.

4

MnCo2O4 deposited by spray pyrolysis as a protective layer for stainless steel interconnects

Szymczewska D., Molin S., Jasiński P.

Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne

|

2018

|

T. 23

53--59

EN

Stainless steel interconnects working in Solid Oxide Fuel Cells stacks are exposed to high temperature resulting in their corrosion. Protective layers for the hydrogen and oxygen sides are necessary to protect the interconnect material, prolongate the stack lifetime and maintain the output power. In this paper MnCo2O4 protective layer for the oxygen side of the interconnect is deposited by spray pyrolysis and is examined.

PL

Interkonektory ze stali nierdzewnej pracujące w stosach tlenkowych ogniw paliwowych ulegają wysokotemperaturowej korozji. Warstwy ochronne są niezbędne do zabezpieczenia materiału interkonektora, wydłużenia czasu pracy stosu i utrzymania mocy wyjściowej na pożądanym poziomie. W tym artykule warstwa ochronna MnCo2O4 dla strony tlenowej interkonektora jest badana i jej zastosowanie jest rozważane.

5

Enhancement in NBE emission and optical band gap by Al doping in nanocrystalline ZnO thin films

Kumar N., Srivastava A.

Opto-Electronics Review

|

2018

|

Vol. 26, No. 1

1--10

EN

Transparent Al doped ZnO nanocrystalline films with a crystallite size less than 19 nm are obtained by spray pyrolysis. Band gap increases monotonically from 3.16 to 3.31 eV with increasing aluminum dopant up to 1.56 at.% facilitating increasing width of a transmission window in addition to the band gap tuning of 4.74% which compares favorably well with literature. UV emission with continuously increasing intensity is obtained which reflects on the good crystalline quality of the films. Also the defect emissions are suppressed remarkably as the dopant Al concentration increases in ZnO. The band gap tuning by quite small increment in dopant amount makes the present films, much attractive for the fabrication of light emitting devices with a much sought-for benefit of large area fabrication. FESEM shows the surface is granular with grain size lying in the range of 20-35 nm and EDX confirms the presence of Al in the doped samples.

6

Nanostructured device based on coated ZnO layer as a window in solar cell applications

Mokhtari H., Benhaliliba M., Boukhachem A., Aida M. S., Ocak Y. S.

Materials Science Poland

|

2018

|

Vol. 36, No. 4

570--583

EN

This work highlights some physical properties related to the influence of aluminum, tin and copper incorporation on nanostructured zinc oxide (ZnO:M; M:Al, Sn and Cu) thin films prepared by ultrasonic spray pyrolysis technique (USP) on glass substrate at 350±5 °C. For the as-grown layers, M- to Zn-ratio was fixed at 1.5 %. The effects of metal doping on structural, morphological, optical and electrical properties were investigated. X-ray diffraction pattern revealed that the as-prepared thin films crystallized in hexagonal structure with (0 0 2) preferred orientation. The surface topography of the films was performed by atomic force microscopy. AFM images revealed inhibition of grain growth due to the doping elements incorporation into ZnO matrix, which induced the formation of ZnO nanoparticles. Optical measurements showed a high transparency around 90 % in visible range. Some optical parameters, such as optical band gap, Urbach energy, refractive index, extinction coefficient and dielectric constant were studied in terms of doping element. Particularly, dispersion of refractive index was discussed in terms of both Cauchy and single oscillator model proposed by Wemple and DiDomenico. Cauchy parameters and single oscillator energy E0 as well as dispersion energy Ed were calculated. Finally, electrical properties were investigated by means of electrical conductivity and Hall effect measurements. The measurements confirmed n type conductivity of the prepared thin films and a good agreement between the resistivity values and the oxidation number of doping element. The main aim of this work was the selection of the best candidate for doping ZnO for optoelectronics applications. The comparative study of M doped ZnO (M:Al, Sn and Cu) was performed. High rectifying efficiency of the Al/n-ZnO/p-Si/Al device was achieved and non-ideal behavior was revealed with n > 4.

7

Optical and structural properties of nanostructured copper oxide thin films as solar selective coating prepared by spray pyrolysis method

Asadi M., Rozati S. M.

Materials Science Poland

|

2017

|

Vol. 35, No. 2

355--361

EN

Copper (II) oxide thin films were prepared by spray pyrolysis method on soda-lime glass substrates using copper acetate precursor solution. Influence of substrate temperature on structural and optical properties was investigated. Structural analysis of these layers were carried out by X-ray diffraction (XRD). Single phase nature and high crystallinity of CuO nanostructures were observed on XRD patterns. The general appearance of the films was uniform and black in color. FT-IR transmittance spectra confirmed the results from the XRD study. Selective solar absorber coatings of copper oxide (CuO) on stainless steel substrates was prepared by spray pyrolysis method. Effect of deposition temperature on optical properties of thin films was investigated. Optical parameters, absorbance (α) and emittance (α) were evaluated from reflectance data. It can be deduced that the porous structure, such as a light traps, can greatly enhance absorbance, while the composition, thickness and roughness of thin films can greatly influence the emissivity. Single phase nature and high crystallinity of CuO nanostructures were observed by XRD patterns. Solar absorbance of thin films were in the range of 85 % to 92 %.

8

Crystalline phase evolution in nanostructured copper sulfide thin films prepared by spray pyrolysis method: the effect of annealing

Nazari R. R., Taloobaghi H. E., Eshghi H.

Materials Science Poland

|

2017

|

Vol. 35, No. 3

673--680

EN

In this study, physical properties of copper sulfide thin films deposited on glass substrates by spray pyrolysis method at different temperatures (260 °C, 285 °C and 310 °C) were investigated. The influence of annealing time on the physical properties of grown layers was also studied. According to FESEM images, the sizes of the compact copper sulfide grains were varied from about 100 nm to 60 nm. Hall effect and resistivity measurements confirmed that all samples had p-type conductivity. The XRD patterns showed that, together with the dominant digenite phase (Cu1.8S) in all samples, the copper-rich phases also appeared as a result of increasing substrate temperature. The optical UV-Vis spectra analysis showed that due to increasing the substrate temperature, the band gap of the layers was reduced from about 2.4 eV to 2.0 eV. We found that as a result of annealing at 400 °C for 1.5 h in Ar atmosphere, the sample which was initially grown at 310 °C with the highest copper content, totally transformed into the polycrystalline monoclinic chalcocite phase (Cu2S) with 3D nanoporous architecture.

9

Optical and sensing properties of Fe doped ZnO nanocrystalline thin films

Shukla R. K., Srivastava A., Kumar N., Pandey A., Pandey M.

Materials Science Poland

|

2016

|

Vol. 34, No. 2

354--361

EN

Undoped and Fe doped ZnO films of different molarities deposited by spray pyrolysis method using zinc nitrate and ferric chloride as precursors show polycrystalline nature and hexagonal wurtzite structure. Crystallite size decreases with an increase in dopant concentration from 0 at.% to 3 at.%. Doping improves the transmission of the films whereas it reduces the optical band gap of ZnO from 3.28 eV to 3.17 eV. The morphology resembles flake-like structures which collapse when the dopant is introduced. The samples are found to be sensitive to CO2 gas. Undoped ZnO shows maximum sensitivity at 350 ºC for higher concentration of CO2. Doped samples show maximum sensitivity at 200 ºC for all CO2 concentrations i.e. from 500 ppm to 4000 ppm. Maximum sensitivity is achieved at temperatures 350 ºC, 250 ºC, 300 ºC and 450 ºC for the samples prepared using precursor solution of 0.1 M molarity.

10

Surface morphology and topographical studies of fluorine doped tin oxide as transparent conducting film

Jeyasubramanian K., Gokul Raja T. S.

Archives of Materials Science and Engineering

|

2016

|

Vol. 78, nr 2

66--70

EN

Purpose: This paper deals about the preparation and characterization of transparent conducting metal oxide doped with fluorine for superhydrophobic applications. Design/methodology/approach: Fluorine doped tin oxide(FTO) have been deposited on glass substrate employing an inexpensive spray pyrolysis route. Uniform coating of thin film was controlled by the parameters like flow rate, exposure duration, temperature of pyrolysis process etc. Findings: Fluorine doped SnO2 was confirmed from FTIR studies. Transparent nature of the coating was evaluated through UV-vis. spectroscopy. Electrical resistivity of the deposited film measured using source meter showed a least resistance of 13 Ω. AFM & SEM analysis revealed the texture of nano SnO2 in the range of 100-300 nm. Unevenness is one of the prerequisite for achieving superhydrophobic nature, which has been explored through AFM results. Practical implications: An attempt has been done to fabricate fluorine doped tin oxide thin film using spray pyrolysis technique may be used for developing super hydrophobic coating application. Originality/value: This study aims to reduce the cost of forming superhydrophobic surfaces on comparison with the process like plasma etching and sensitizing with nanoparticles, etc.

11

Improved Light Conversion Efficiency Of Dye-Sensitized Solar Cell By Dispersing Submicron-Sized Granules Into The Nano-Sized TiO2 Layer

Song S. A., Lim M. J., Jung K. Y., So W.-W., Moon S.-J.

Archives of Metallurgy and Materials

|

2015

|

Vol. 60, iss. 2B

1467--1471

EN

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.

12

Niskotemperaturowe utlenianie CO na katalizatorach Au-Al2O3-Co3O4

Rajska M., Małecka B.

Materiały Ceramiczne

|

2014

|

T. 66, nr 3

286--291

PL

W artykule została przedstawiona charakterystyka fizykochemiczna oraz wyniki badań katalitycznych dla reakcji niskotemperaturowego utleniania CO na wybranych katalizatorach złotych naniesionych na γ-Al2O3, Co3O4 oraz Al2O3-Co3O4 (1:1 mol tlenku). Podłoża katalityczne zostały otrzymane za pomocą rozkładu termicznego aerozolu wodnego roztworu azotanów glinu i/lub kobaltu. Metoda termicznego rozkładu aerozolu soli pozwoliła na jednoetapową syntezę proszków o kulistych ziarnach i dużej homogeniczności składu. Na otrzymane podłoża zostało naniesione złoto za pomocą metody osadzania ze strącaniem w ilości 2% wag. Otrzymane nośniki oraz katalizatory złote zostały następnie scharakteryzowane za pomocą technik XRD, BET, SEM i analizy ziarnowej. Uzyskane materiały badano również pod kątem aktywności katalitycznej w reakcji niskotemperaturowego utleniania CO. Najwyższą aktywność katalityczną wykazał układ złoto/ tlenek kobaltu, który w temperaturze 148 °C osiągnął stopień konwersji równy 90%.

EN

In this paper, some physicochemical properties and results of catalytic measurements for low temperature CO oxidation of selected gold catalysts deposited on γ-Al2O3, Co3O4 and Al2O3-Co3O4 (1:1 molar ratio) were described. The catalytic supports were prepared with a spray pyrolysis method by using aqueous solutions of aluminium and cobalt nitrates. The spray pyrolysis method guarantees the one-stage synthesis of powders with spherical-shape of particles and high homogeneity of chemical composition. The gold particles were deposited on the supports in an amount of 2 wt%. The prepared samples were characterized by XRD, N2 adsorption, SEM, LALLS for particle size analysis, and with respect to catalytic activity in the reaction of low temperature CO oxidation. The highest activity showed Au/Co3O4 which had 90% CO conversion at 148 °C.

13

Preparation of ITO films using a spray pyrolysis solution containing an acetylacetone chelating agent

Gao Y., Zhao G., Duan Z., Ren Y.

Materials Science Poland

|

2014

|

Vol. 32, No. 1

66--70

EN

Indium tin oxide (ITO) films were deposited on soda-lime glass substrates by the spray pyrolysis method using a spray solution of InCl33H2O as a precursor, SnCl45H2O as a dopant and acetylacetone (AcAcH) as a chelating agent. The effect of the addition of AcAcH to the spray solution on the surface morphology of the ITO film was investigated. The surface quality of the film prepared from the spray solution with AcAcH was better than that without AcAcH. The ITO film with the thickness of 230 nm, using the spray solution with AcAcH, exhibited the lowest resistivity of 4.75 × 10􀀀4 Wcm and higher optical transmittance of 85 %, respectively.

14

Optimization of growth temperature of multi-walled carbon nanotubes fabricated by chemical vapour deposition and their application for arsenic removal

Mageswari S, Kalaiselvan S, Syed Shabudeen P S, Sivakumar N, Karthikeyan S

Materials Science Poland

|

2014

|

Vol. 32, No. 4

709--718

EN

Multi-walled carbon nanotubes have been synthesized at different temperatures ranging from 550 ◦C to 750 ◦C on silica supported Fe–Mo catalyst by chemical vapour deposition technique using Cymbopogen flexuous oil under nitrogen atmosphere. The as-grown MWNTs were characterized by scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction analysis (XRD) and Raman spectral studies. The HRTEM and Raman spectroscopic studies confirmed the evolution of MWNTs with the outer diameter between 20 and 40 nm. The possibility of using as-grown MWNTs as an adsorbent for removal of As (V) ions from drinking water was studied. Adsorption isotherm data were interpreted by the Langmuir and Freundlich equations. Kinetic data were studied using Elovich, pseudo-first order and pseudo-second order equations in order to elucidate the reaction mechanism.

15

A comparative study of dip coating and spray pyrolysis methods for synthesizing ITO nanolayers by using Ag colloidal sol

Rajabi N, Heshmatpour F, Malekfar R, Bahari-Poor H R, Abyar S

Materials Science Poland

|

2014

|

Vol. 32, No. 1

102--106

EN

Indium tin oxide (ITO) films were deposited on glass substrates by dip-coating and thermal pyrolysis methods. Sn (IV) is often used in the spray method as a precursor salt, but in this research we have employed a new procedure that uses Sn (II) and In(NO3)3 for preparation of transparent conductive thin films. Then, colloidal Ag was deposited on the ITO layers in order to compare the two synthesis methods, and the structural and electrical properties of the resultant films were investigated by FESEM, XRD, and four-terminal resistometry. The obtained films are polycrystalline with a preferred orientation of (200). The XRD patterns of the films indicate that in both films, the Sn phase is crystallized separately from In2O3. The presence of a Sn peak and the overall low intensity of XRD peaks suggest relative crystallization of ITO structure. For this reason, Ag films were deposited by dip coating method using a colloidal sol. By analyzing the XRD patterns of Ag-ITO films after eliminating the Sn peak, the increased intensity of the peaks confirmed the relatively good crystallization of the ITO films. The results show that the films with a sheet resistance as low as 2 × 10-2 W cm, which is beneficial for solar cells, were achieved.

16

Fabrication and Optoelectronic properties of Fluoride tin oxides/porous silicon/p-Silicon heterojunction

Hadi H. A.

International Letters of Chemistry, Physics and Astronomy

|

2014

|

Vol. 17, iss. 2

142--152

EN

In this paper, formation of a nanostructure semi transparence fluoride tin oxides (FTO) by spray pyrolysis technique on porous silicon PS layer. Porous silicon PS layer was prepared by anodization of p-type silicon wafers to fabricate of the UV- Visible Fluoride-doped tin oxide /Porous silicon /p-Si heterojunction photodetector. Optical properties of FTO thin films were measured. The optical band gap of 3.77 eV for SnO2 : F for film was deduced. From (I-V) and (C-V) measurements, the barrier ØB height for FTO/PS diode was of 0.77, and the built in voltage Vbi, which was of 0.95 V. External quantum efficiency was 55 % at 500 nm which corresponding to peak responsivity of 1.15 A/W at 1 V bias. The PS band gap in the vicinity of PS/c-Si heterojunction was 1.38 eV.

17

Optical dispersion characterization of sprayed Zn1-xMnxO thin films

Habubi N.F., Chiad S.S., Oboudi S.F., Toma Z.A.

International Letters of Chemistry, Physics and Astronomy

|

2013

|

Vol. 4

1-8

EN

Uniform and adherent Zn1-xMnxO films have been deposited by using spray pyrolysis technique on glass substrates. The optical properties and dispersion parameters of zinc oxide have been studied as a function of doping concentration with Mn. Changes in direct optical energy band gap of cobalt oxide films were confirmed after doping, The optical energy gap Eg increased from 3.13 eV for the undoped ZnO to 3.39 eV with increasing the doping concentration of Mn to 4%. The changes in dispersion parameters and Urbach tails were investigated. An increase in the doping concentration causes a decrease in the average oscillator strength. The single-oscillator parameter has been reported.

18

Oxide layers fabricated by spray pyrolysis on metallic surfaces

Kobierowska K., Karpińska M., Molin S., Jasiński P.

Elektronika : konstrukcje, technologie, zastosowania

|

2012

|

Vol. 53, nr 1

74-76

EN

In this paper the possibilities of using spray pyrolysis method to produce yttrium stabilized zircoma layers have been examined. A stainless steel, type 316L, was used as a substrate. It was important to determine the optimal conditions of the films preparation. The basic parameter in the pyrolysis technology process is a surface temperature, which was systematically examined. The layer was intended to be used as protective film for metallic implants. In order to determine the corrosion resistance and protective properties of produced layers, potentiodynamic measurements in mimicking tissue environment solution were carried out. It provided information about the corrosive effects, which occur on the steel surface and on the protective layer. The experimental results showed that improvement of corrosion resistance properties was obtained by spraying the precursor at 390°C.

PL

W niniejszym artykule przebadane zostały możliwości zastosowania meetody pirolizy aerozolowej do wytwarzania warstw z tlenku cyrkonu stabilizowanego itrem na podłożu ze stali nierdzewnej 316L. W pierwszej kolejności bardzo ważne było określenie optymalnych warunków przygotowania warstw. Podstawowym parametrem w procesie napylania warstw metodą pirolizy aerozolowej jest temperatura powierzchni, której wpływ systematycznie przebadano. Przeprowadzone badania wykazały przydatność warstw z zastosowaniem tlenku cyrkonu stabilizowanego itrem wytworzonych metodą pirolizy aerozolowej. W celu określenia odporności na korozję oraz właściwości ochronnych zostały przeprowadzone pomiary potencjodynamiczne w roztworze imitującym środowisko tkankowe. Wyniki uzyskane z pomiarów laboratoryjnych dostarczyły informacji na temat zjawisk korozyjnych zachodzących na powierzchni stali oraz warstw ochronnych. Badania pokazały, że warstwą wykazującą poprawę właściwości antykorozyjnych jest ta, która powstała poprzez napylenie prekursora polimerowego w temperaturze 390°C.

19

Preparation and characterization of Au supported MOx-Al2O3 (M = Mn, Cu) powders for low-temperature CO oxidation

Małecka B., Rajska M.

Materiały Ceramiczne

|

2010

|

T. 62, nr 4

540-544

EN

MOx–Al2O3 (M = Mn, Cu) powders were synthesized by the spray pyrolysis process and then used as a support for Au/(Mn,Cu)Ox–Al2O3 catalysts preparation via the deposition–precipitation method. Gold catalysts on oxide supports were tested for oxidation of CO. The samples were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy–dispersive X–ray spectroscopy (EDS), and via determination of specific surface area by the BET method. The SEM results showed that all catalysts have a small-dimension circular shape of particles. Catalysts obtained with the spray-pyrolysis method were found to have great specific surface areas. Gold catalyst containing copper oxide on alumina is shown to be more active than manganese oxide on the same support.

PL

Wykorzystując proces pirolizy rozpyłowej zsyntezowano proszki MOx–Al2O3 (M = Mn, Cu), a następnie wykorzystano jako nośnik do otrzymania katalizatora Au/(Mn,Cu)Ox–Al2O3 metodą strącania-osadzania. Katalizatory ze złotem osadzonym na nośniku tlenkowym badano w przypadku utleniania CO. Próbki charakteryzowano za pomocą dyfrakcji promieniowania X (XRD), skaningowej mikroskopii elektronowej (SEM) wraz z rentgenowską spektroskopią z dyspersją energii (EDS) i drogą oznaczenia powierzchni właściwej metodą BET. Wyniki SEM ujawniły, że wszystkie katalizatory mają okrągły kształt drobnych cząstek. Katalizatory otrzymane metodą pirolizy rozpyłowej miały bardzo dużą powierzchnię właściwą. Katalizator ze złotem osadzonym na podłożu z tlenków miedzi i glinu okazał się bardziej aktywny w porównaniu do katalizatora wykorzystującego tlenek magnezu jako dodatek do tlenku glinu.

20

The influence of glass surface preparation on electrical and optical properties of SnO2 thin films obtained by spray pyrolysis technique

Nocuń M., Pająk Z.

Optica Applicata

|

2008

|

Vol. 38, nr 1

181-187

EN

SnO2 conducting thin films were prepared by spray pyrolysis. Glass surface was prepared by etching in HF and acetic acid solutions. Sodium barrier coatings with different compositions were prepared by the sol-gel technique. The influence of the glass surface preparation on optical properties of SnO2 was studied using reflectance spectroscopy. XPS was used as a tool to evaluate barrier properties of the coating. The morphology of the thin layer was studied by a scanning electron microscope. The results have shown that the titanium containing coating has the best sodium diffusion barrier property. The conductivity of SnO2 film strongly depends on the glass surface preparation. The lowest conductivity was measured for clean glass but the highest for alumina containing barrier coating.