Microstructural and optical investigations of Ce-doped barium titanate thin films by FTIR and spectroscopic ellipsometry

Mohamed, S. H.; Dughaish, Z. H.

doi:10.1080/14786435.2011.642320

Cited by 19 publications

(10 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bandgap of 3.261 eV of TiO 2 is reduced to 2.920 eV after the addition of 5.0 mol% Fe and further decreased to 2.096 eV for 7.5 mol% Fe to 2.112 eV for the addition of 10 mol% Fe. This bandgap energy is even lower than those reported by previous studies that involve the addition of acid and considered lower Fe ion concentrations (Fe ≤ 5 wt/at/mol%) [33][34][35][36][37][38]40,41,43,44,47,54] and higher (Fe = 5 wt mol% À1 ) Fe ion concentrations. [43,53] These results agree with what were reported by the previous works [40,44,50] that increasing Fe ion concentration reduces the bandgap energy of TiO 2 .…”

Section: Uv-vis Spectroscopycontrasting

confidence: 58%

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Liboon

Cabo

Unabia

et al. 2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein, TiO 2 , La-added, and Fe-added TiO 2 coatings are synthesized by sol-gel spin coating using acid catalyst-free titania precursors, and their microstructural and optical characteristics are studied. The possible reaction mechanism for synthesizing TiO 2 -based coatings using catalyst-free precursor is presented and correlated to their microstructural characteristic. TiO 2 coatings are developed and found to be anatase in phases having submicron morphological features. The anatase composition of TiO 2 coating decreases with increasing La or Fe ion concentrations. This manifests the inhibitory effect of increasing La and Fe ions to the formation of anatase TiO 2 . Moreover, the addition of La ions caused no significant changes in the reflectance spectra and bandgap energy of TiO 2 . In contrast, a remarkable red shift was observed with increasing Fe ion concentration. The calculated bandgap decreases from 3.261 to 2.096 eV with the addition of 7.5 mol% Fe ions, attributed to the formation of new energy states below the conduction band of TiO 2 induced by the Fe ion. These results suggested that a low-cost Fe added-TiO 2 material can be synthesized using an acid catalyst-free precursor that could extend the photocatalytic efficiency of TiO 2 to the visible light region.

show abstract

Section: Uv-vis Spectroscopycontrasting

confidence: 58%

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Liboon

Cabo

Unabia

et al. 2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…S1, see Supporting Information) peaks are observed at ̴ 3420-3430 and 1605-1610 cm -1 corresponding to stretching and bending vibration modes of the O-H group. 43,44 The bands at 2923 cm -1 are related to the C-H bending vibration. The peaks are also observed at 872 cm -1 corresponding to a Ti-O bond.…”

Section: Resultsmentioning

confidence: 99%

“…40,42 FTIR results (Figure S1) peaks are observed at ∼3420−3430 and 1605−1610 cm −1 corresponding to stretching and bending vibration modes of the O−H group. 43,44 The bands at 2923 . 45,46 The XRD patterns for the CoBST and CeBST nanoparticles (Figure S2) show strong diffraction peaks at 32, 38, 46, and 57°and can be attributed to the (110), ( 111), (200), and (211) crystal planes.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Superamphiphobic Surfaces Prepared by Coating Multifunctional Nanofluids

Esmaeilzadeh

Sadeghi

Bahramian

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Construction of surfaces with the capability of repelling both water and oil is a challenging issue. We report the superamphiphobic properties of mineral surfaces coated with nanofluids based on synthesized Co-doped and Ce-doped Barium Strontium Titanate (CoBST and CeBST) nanoparticles and fluorochemicals of trichloro(1H,1H,2H,2H-perfluorooctyl)silane (PFOS) and polytetrafluoroethylene (PTFE). Coating surfaces with these nanofluids provides both oil (with surface tensions as low as 23 mN/m) and water repellency. Liquids with high surface tension (such as water and ethylene glycol) roll off the coated surface without tilting. A water drop released from 8 mm above the coated surface undergoes first a lateral displacement from its trajectory and shape deformation, striking the surface after 23 ms, bouncing and rolling off freely. These multifunctional coating nanofluids impart properties of self-cleaning. Applications include coating surfaces where cleanliness is paramount such as in hospitals and domestic environments as well as the maintenance of building facades and protection of public monuments from weathering. These superamphiphobic-doped nanofluids have thermal stability up to 180 °C; novel industrial applications include within fracking and the elimination of condensate blockage in gas reservoirs.

show abstract

“…Ellipsometric data Ψ and ∆ for variable wavelengths were tted in the optical model. This reduction in Ba has been previously reported [11,12]. Upon annealing and within a precision of 2 at.%, the EDAX analysis does not reveal any obvious change in the chemical composition of the lms.…”

Section: Introductionmentioning

confidence: 58%

Effect of Low Temperature Annealing on Microstructural and Optical Properties of (BaTiO₃)_0.84(CeO₂)_0.16Thin Films

Dughaish

2013

Acta Phys. Pol. A

Self Cite

View full text Add to dashboard Cite

(BaTiO3)0.84(CeO2)0.16 thin lms were prepared by electron beam evaporation method. X-ray diraction and scanning electron microscopy revealed the amorphous structure for the as-prepared lms. The thin lms were annealed at temperatures: 200, 300, 400 and 500• C for 1 h in air. Small and low intensity crystalline peaks were observed at annealing temperature of 200• C for 1 h. The intensity and the number of the crystalline peaks were increased with increasing annealing temperature. Nanocrystals, of dimensions in the range 6076 nm, were obtained when the annealing was performed at 500• C. The indexed diraction pattern of the annealed thin lm revealed a monoclinic structure. A two-layer model was used to describe the experimental ellipsometric data. The Bruggeman eective medium approximation was used to describe the surface roughness layer and the Cauchy dispersion relation was used to describe the main (BaTiO3)0.84(CeO2)0.16 layer. The optical constants of the thin lms over 3001100 nm spectral range were measured. The optical band gap showed gradual decrease with the annealing temperature. The accurate determination of the optical constants of the thin lms is very useful and should be taken into consideration in the design of devices using optical thin lms technology.

show abstract

Microstructural and optical investigations of Ce-doped barium titanate thin films by FTIR and spectroscopic ellipsometry

Cited by 19 publications

References 26 publications

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Superamphiphobic Surfaces Prepared by Coating Multifunctional Nanofluids

Effect of Low Temperature Annealing on Microstructural and Optical Properties of (BaTiO₃)_0.84(CeO₂)_0.16Thin Films

Contact Info

Product

Resources

About

Microstructural and optical investigations of Ce-doped barium titanate thin films by FTIR and spectroscopic ellipsometry

Cited by 19 publications

References 26 publications

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO2 and Fe–TiO2

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO2 and Fe–TiO2

Superamphiphobic Surfaces Prepared by Coating Multifunctional Nanofluids

Effect of Low Temperature Annealing on Microstructural and Optical Properties of (BaTiO3)0.84(CeO2)0.16Thin Films

Contact Info

Product

Resources

About

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Phase Composition, Microstructure, and Optical Characteristics of Spin‐Coated La‐TiO₂ and Fe–TiO₂

Effect of Low Temperature Annealing on Microstructural and Optical Properties of (BaTiO₃)_0.84(CeO₂)_0.16Thin Films