Structural and optical properties of Al2O3 nanocrystalline: Effect of deposition time

Oleiwi, Hind Fadhil; Al-Taay, H.F.; Al-Ani, S. K. Yassin; Tahir, Khawla J.

doi:10.1063/1.5123097

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…Meanwhile, results from our NLP-generated database 15 successfully predict the existence of an absorption peak below 300 nm. 26 It is worth noting that there is only one value below the fitted peak. This brings possible sensitivity to the Sellmeier model.…”

Section: Resultsmentioning

confidence: 98%

“…Owing to its low absorption among ultraviolet and visible bands, alumina films can be combined in multilayers with silicon dioxide (n = 1.48) for UV-laser applications. 26 Amorphous Al 2 O 3 also plays an important role in optical applications such as optical lenses and windows, antireflection coatings, and optical waveguides. 27 As it is a very popular material, there exist 56 refractive-index data with wavelength information of Al 2 O 3 in our database, 24 that are not present in the corpus of scientific literature that was text-mined to afford our database.…”

Section: Resultsmentioning

confidence: 99%

“…Al 2 O 3 has also been found to present promising applications as an optical material. Owing to its low absorption among ultraviolet and visible bands, alumina films can be combined in multilayers with silicon dioxide ( n = 1.48) for UV-laser applications . Amorphous Al 2 O 3 also plays an important role in optical applications such as optical lenses and windows, antireflection coatings, and optical waveguides …”

Section: Resultsmentioning

confidence: 99%

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Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

Zhao

Cole

2022

J. Chem. Inf. Model.

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Predicting the properties of materials prior to their synthesis is of great significance in materials science. Optical materials exhibit a large number of interesting properties that make them useful in a wide range of applications, including optical glasses, optical fibers, and laser optics. In all of these applications, refraction and its chromatic dispersion can directly reflect the characteristics of the transmitted light and determine the practical utility of the material. We demonstrate the feasibility of reconstructing chromatic-dispersion relations of well-known optical materials by aggregating data over a large number of independent sources, which are contained within a material database of experimentally determined refractive indices and wavelength values. We also employ this database to develop a machine-learning platform that can predict refractive indices of compounds without needing to know the structure or other properties of a material of interest. We present a web-based application that enables users to build their customized machine-learning models; this will help the scientific community to conduct further research into the discovery of optical materials.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

Zhao

Cole

2022

J. Chem. Inf. Model.

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“…It is well known that the optical bandgap of TiO 2 ‐SiO 2 and Al 2 O 3 are direct. [ 32–34 ] Hence, E g can be determined by plotting (ahν) 2 versus hν, as shown in Figure 6B. [ 35 ] The E g values of all the NCTFs were calculated and presented in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, E g values of TiO 2 ‐SiO 2 (for TiO 2 anatase phase) and Al 2 O 3 are about 3.0–3.4 and 7.0–7.6 eV, respectively. [ 32–34 ] The bandgap of Al 2 O 3 –based NCTFs increases from 3.08 to 3.49 eV when the Al 2 O 3 content rises from 0% to 50%. The variation in the optical bandgap of the NCTFs possibly depends on the bandgaps of three bare oxides, resulting in a change in NCTFs bandgap with the different compositions of these oxides.…”

Section: Resultsmentioning

confidence: 99%

High transmittance and excellent hardness TiO₂‐SiO₂‐Al₂O₃ nanocomposite thin film for anti‐scratch surface applications

et al. 2022

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In this work, TiO2‐SiO2‐x%Al2O3 (x = 0–50) nanocomposite thin films (NCTFs) with high purity, relatively homogeneity, high transmittance, excellent hardness, and crack‐free were synthesized successfully by a spin‐coating technique. It was demonstrated that the transmittance and the hardness of TiO2‐SiO2‐x%Al2O3 NCTFs are strongly affected by the Al2O3 content. The highest transmittance of 90.9% in the visible region (400 to 800 nm) and the excellent hardness and scratch resistance with a maximum hardness value of 7 Mohs and 11.8 GPa of nanoindentation and a critical scratch load of 47.6 mN for the TiO2‐SiO2‐30%Al2O3 NCTF annealed at 500°C in the air for 3 h was achieved. A hardness enhancement mechanism was proposed and discussed in detail. The obtained results show that the fabricated TiO2‐SiO2‐Al2O3 NCTFs have a great potential for anti‐scratch resistance surface applications.

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The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Sadek,

Reda,

Khattab

et al. 2023

J Inorg Organomet Polym

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This work represents the shaping of alumina–zinc oxide (AZ) samples with the direct coagulation casting method. The effect of zinc oxide (0, 10, 20, 30, and 40 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ samples were studied. The effect of titanium oxide (2, 5, and 7 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ sample with 40 wt% of zinc oxide were studied. Furthermore, the optical properties, magnetic properties, and antimicrobial activity were measured. The results indicate that the increase in zinc oxide enhances the formation of zinc aluminate, which has a gahnite phase. Moreover, increasing the zinc oxide increases the apparent porosity and decreases the grain size and bulk density at various firing temperatures. On the other hand, the addition of 5 wt% titanium oxide increases the bulk density to 3.5 g/cm3 compared to 1.72 g/cm3 with no titania. The apparent porosity and compressive strength reached 5% and 69.2 MPa after 5 wt% TiO2 addition; respectively, compared to 59% and 27.2 MPa with no titania addition. The prepared samples show promising optical band gap of 2.98–3.97 eV, a mixed magnetic behavior, and favorable antibacterial activity against E. coli, S. aureus, B. cereus strains.

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Structural and optical properties of Al2O3 nanocrystalline: Effect of deposition time

Cited by 7 publications

References 12 publications

Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

High transmittance and excellent hardness TiO₂‐SiO₂‐Al₂O₃ nanocomposite thin film for anti‐scratch surface applications

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

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Structural and optical properties of Al2O3 nanocrystalline: Effect of deposition time

Cited by 7 publications

References 12 publications

Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

Reconstructing Chromatic-Dispersion Relations and Predicting Refractive Indices Using Text Mining and Machine Learning

High transmittance and excellent hardness TiO2‐SiO2‐Al2O3 nanocomposite thin film for anti‐scratch surface applications

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

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Product

Resources

About

High transmittance and excellent hardness TiO₂‐SiO₂‐Al₂O₃ nanocomposite thin film for anti‐scratch surface applications