Wyniki wyszukiwania - BazTech

1

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.

2

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.

3

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.

4

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.