Effect of substrate temperature on microstructure and properties of nanocrystalline titania thin films prepared by pulsed laser deposition

Balakrishnan, G.; Manavalan, Shaktivel; Babu, R. Venkatesh; Song, Joon‐Tae

doi:10.17586/2220-8054-2016-7-4-621-623

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…The Rrms values show a similar tendency to that of crystallite sizes observed from XRD analysis. Moreover, a similar tendency in surface roughness with the substrate temperature has also been observed by other authors [37,49]. It has been reported that the Rrms value of sputtered TiO2 films increases from 2.9 to 14.6 nm as the substrate temperature increases from 150 to 240 °C [37].…”

Section: Surface Morphology Analysissupporting

confidence: 84%

“…It has been reported that the Rrms value of sputtered TiO2 films increases from 2.9 to 14.6 nm as the substrate temperature increases from 150 to 240 °C [37]. Moreover, it has also been found that the surface roughness of TiO2 films prepared by pulsed laser deposition is increased from 3 to 8 nm as substrate temperature increases from RT to 500°C [49].…”

Section: Surface Morphology Analysismentioning

confidence: 97%

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Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Doghmane

Challali

Touam

et al. 2021

JNanoR

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Titanium dioxide thin films were deposited by radio frequency sputtering on glass substrates at different substrate temperatures. Hence, we first optimized the preparation conditions and parameters which offer better control and reproducibility of film fabrication. Then, we investigate the structural, morphological and optical properties of the prepared titanium dioxide thin films. To do so, we used several characterization techniques: X-ray diffraction, Raman spectroscopy, scanning electron microscopy, atomic force microscopy and ultraviolet-visible spectroscopy. Interesting results were obtained, e.g. X-ray diffraction analysis shows that the films crystallize only in the anatase tetragonal structure with a preferential orientation along the (101) plane. The intensity of the (101) diffraction peak and the crystallite size are found to increase with increasing substrate temperature, indicating a crystallinity improvement of the films. Raman peaks observed around 144, 197, 399, 515 and 639 cm−1 conﬁrm that all samples possess anatase phase and the crystallinity is enhanced with increasing substrate temperatures. The analysis of scanning electron microscopy and atomic force microscopy images demonstrates that increasing the substrate temperature significantly affects the morphology, grain size and surface roughness of TiO2 films. The ultraviolet-visible spectroscopy analysis put into evidence that the ﬁlm deposited at RT is highly transparent in the visible region with average transmittance greater than 84%. Higher substrate temperatures result in a slight decrease of transmittance. Moreover, the direct optical band gap decreases while the refractive index increases with increasing the substrate temperature. Thus, the obtained results reveal that ultraviolet-visible can be considered as a potential material for optical and photovoltaic applications.

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Section: Surface Morphology Analysissupporting

confidence: 84%

Section: Surface Morphology Analysismentioning

confidence: 97%

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Doghmane

Challali

Touam

et al. 2021

JNanoR

View full text Add to dashboard Cite

show abstract

“…However, this material is highly affected by corrosion where environmental circumstances play an important role, especially in the external corrosion of the oil pipeline. Other factors influencing mild steel corrosion rate include the content of the petroleum product passing through it, moisture, temperature, pH, and soil type [7,8].…”

Section: Introductionmentioning

confidence: 99%

Nano-structured Thin Films for Hydrogen-Permeation Barrier Applied on AISI 1018 Steel Used in Petroleum Applications

Mohammed¹,

Mahdi²,

Thamir³

2023

ETJ

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 A third coating layer gives an acceptable adhesion force with the highest deposition rate.  Nano-structured coating increased bulk AISI 1018 steel tensile strength after the hydrogen charging process.  Double layer of Ti and TiO2+Al2O3 coat gives a 20 percent increase in tensile strength after HC for AISI 1018 steel.  The layer of ceramic coatings TiO2withAl2O3 as coating Nano-structured thin films can improve the hydrogen permeation resistance  The Nano titanium layer showed the main portion in bondingHydrogen embrittlement is a diffusible Hydrogen that is harmful to the toughness of iron. It follows, therefore, that the harmful influence of diffusible Hydrogen can be mitigated by preventing its entry into steel. This approach was achieved by using three coating layers as a coating nanostructure thin layer by DC sputtering on steel structural (AISI l018) and hydrogen charging (HC) effect on uncoated and different Nano coated tensile specimens. The first layer was Titanium as a bonding layer, the second layer was TiO2 with Al2O3, and the third layer was Al2O3. Using a titanium Nano layer coating on AISI1018 steel tensile specimens increased the tensile strength from 570 to 659 M Pa with 16 hours of charging, which is considered a good increase. In contrast, the elongation remained in a steady -state with little difference in values compared to changing the charging time and the coating of the double layer. Furthermore, it was found that samples coated with TiO2 and Al2O3 by the DC method had advanced hydrogen embrittlement resistance and increased tensile strength (from 565 to 680 M Pa with 8 hours of charging process). M oreover, the maximum adhesion value was related to the triple layer at 596 psi, and the lowest value was 309 psi using the titanium layer alone. The coating time was 5 hours of the sputtering process for all specimens.The coating layers are considered a good barrier for hydrogen permeation through steel structures (AISI 1018).

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“…AISI1018 steel is highly affected by corrosion where environmental conditions play an important role, particularly within the exterior corrosion of oil pipelines. Also, other factors such as the content of the petroleum products that pass through it, moisture, temperatures, pH as well as soil types influence steel corrosion rate [1,[5][6]. Furthermore, corrosion affects mechanical properties, as it was found that the more acidic the soil is, the fewer the metal's tensile strength and fracture toughness will be [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation Nano-coating for the Corrosion Protection of Petroleum storage tanks Steel

Ali¹,

Mahdi²,

Thamer³

2022

ETJ

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Using the BNi-2 alloy nano layer improves corrosion resistance.• Applying DC sputtering as a coating method. • Predicting generated phases for the nanocoating from EDX analysis on equilibrium phase diagrams.This work studies the protection from corrosion in the inner surface of petroleum storage tanks by applying nano-coating on the AISI1018 steel type used in these tanks. BNi-2 alloy, used as coating layer, was deposited using the DC sputtering technique to obtain protection layers of nano-coating. The cyclic potential dynamic polarization technique is used to study and evaluate the resistant metal to localize corrosion, for example, pitting and crevice corrosion. The samples were evaluated in a 3.5% NaCl aqueous solution using the polarization method to determine the corrosion rate. The input parameters of deposition included ion current 16 mA, vacuum 10 -1 mbar, time of deposition was 60 minutes, and the distance between target and substrate was 2.5 cm. The surface roughness of the uncoated specimens was (0.1466 µm), and after coating, it decreased to (0.0933µm). The most important factor that affects the corrosion of the coated steel surface is the surface topography of steel before coating, as it is known that the spattering process coats the facing surface to target better than the inclined surface topography. Therefore, some micro scratches non-coated well worked as nucleation for corrosion as detected in stereo microscope images for coated and uncoated surfaces. By calculating the corrosion rate from cyclic potential dynamic polarization for coated and uncoated workpieces, pitting and crevice corrosion improved approximately ten times compared to the uncoated AISI1018 steel surface.

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Effect of substrate temperature on microstructure and properties of nanocrystalline titania thin films prepared by pulsed laser deposition

Cited by 8 publications

References 13 publications

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Nano-structured Thin Films for Hydrogen-Permeation Barrier Applied on AISI 1018 Steel Used in Petroleum Applications

Investigation Nano-coating for the Corrosion Protection of Petroleum storage tanks Steel

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