Coloration of molybdenum oxide thin films synthesized by spray pyrolysis technique

Afify, H. H.; Hassan, S.A.; Abouelsayed, A.; Demian, S. E.; Zayed, H. A.

doi:10.1016/j.tsf.2016.12.033

Cited by 24 publications

(7 citation statements)

References 29 publications

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“…From recent studies in which the spray pyrolysis technique was used, it was reported that it can be implemented for the production of various powder materials such as inorganic oxides, metals oxides, and nanoparticle oxides, among other compounds. 28,29,81,82 The Journal of Physical Chemistry C…”

Section: Introductionmentioning

confidence: 99%

“…The atomization ultrasound, which was used in the experimental procedure, produces droplets with a fairly uniform size distribution. From recent studies in which the spray pyrolysis technique was used, it was reported that it can be implemented for the production of various powder materials such as inorganic oxides, metals oxides, and nanoparticle oxides, among other compounds. ,,, …”

Section: Introductionmentioning

confidence: 99%

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Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

et al. 2019

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In this article, the synthesis by means spray pyrolysis method, of the CaMoO4 and rare earth cation (RE 3+)-doped CaMoO4:xRE 3+ (RE 3+ = Eu 3+ , Tb 3+ , and Tm 3+ ; and x= 1%, 2%, and 4% mol) compounds is presented. The as-synthesized samples were characterized using x-ray diffraction (XRD), Rietveld refinement, field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and photoluminescence (PL) spectroscopy. To complement and rationalize the experimental results, first principle calculation, at density functional theory level, have been performed to analyze the band structure and density of states. In addition, a theoretical method based on the calculations of surface energies and Wulff construction was applied to obtain the morphology transformation of the CaMoO4 and CaMoO4:RE 3+ microstructures. The experimental morphologies can be observed in the FE-SEM images. The PL behavior of the co-doped samples exhibited well-defined bands in the visible region. The samples with 2% and 4% of RE 3+ released white emission according to the chromaticity coordinates (0.34, 0.34) and (0.34, 0.33), respectively. Present results provide not only a deep understanding of the structure-property relationships of CaMoO4-based phosphor, but also can be employed as a guideline for the design of the electronic structure of the materials and the fabrication of photo-functional materials with optimal properties, which allows for the modeling of new phosphors for applications in solid-state lighting.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

et al. 2019

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“…The optical absorption spectra in the 190-900 nm are generally not representative of the molybdenum oxide formation, since there is no well-defined absorbance band in this spectral region. However, in presence of the electric field, the broad band at higher wavelength could be indicative of the presence of positively charged structural defects, where electrons can be captured by the oxygen vacancies [11]. On the overall, the optical absorption spectra give indirectly semi-quantitative information about the nanoparticles concentrations.…”

Section: Resultsmentioning

confidence: 99%

Molybdenum oxide nanocolloids prepared by an external field-assisted laser ablation in water

Spadaro

Bonsignore

Fazio

et al. 2018

EPJ Web of Conferences

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Abstract. The synthesis of extremely stable molybdenum oxide nanocolloids by pulsed laser ablation was studied. This green technique ensures the formation of contaminant-free nanostructures and the absence of by-products. A focused picosecond pulsed laser beam was used to ablate a solid molybdenum target immersed in deionized water. Molybdenum oxide nearly spherical nanoparticles with dimensions within few nanometers (20-100 nm) are synthesized when the ablation processes were carried out, in water, at room temperature and 80°C. The application of an external electric field during the ablation process induces a nanostructures reorganization, as indicated by ScanningTransmission Electron Microscopy images analysis. The ablation products were also characterized by some spectroscopic techniques: conventional UV-vis optical absorption, atomic absorption, dynamic light scattering, micro-Raman and X-ray photoelectron spectroscopies. Finally, NIH/3T3 mouse fibroblasts were used to evaluate cell viability by the sulforhodamine B assay

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“…Physical properties of MoO 3 films depend mainly on the structure and surface morphology as well as an excess or deficient oxygen which controls the electrical * E-mail: srsuguru.phy@gmail.com and optical properties. Various thin film deposition techniques, namely thermal evaporation [18,[22][23][24], electron beam evaporation [25], pulsed laser deposition [26,27], chemical vapor deposition [7], electrodeposition [28,29], spray pyrolysis [30][31][32][33], sol-gel process [8,[34][35][36], DC magnetron sputtering [37][38][39] and RF magnetron sputtering [2,[40][41][42] have been used for the preparation of MoO 3 thin films. Physical properties of deposited films critically depend on the deposition method and the process parameters fixed during the growth of the films.…”

Section: Introductionmentioning

confidence: 99%

Sputtering pressure influenced structural, electrical and optical properties of RF magnetron sputtered MoO₃ films

Subbarayudu¹,

Reddy²,

Uthanna

2020

Materials Science-Poland

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MoO3 films were deposited by RF magnetron sputtering technique on glass and silicon substrates held at 473 K by sputtering of metallic molybdenum target at an oxygen partial pressure of 4 × 10−2 Pa and at different sputtering pressures in the range of 2 Pa to 6 Pa. The influence of sputtering pressure on the structure and surface morphology, electrical and optical properties of the MoO3 thin films was studied. X-ray diffraction studies suggest that the films deposited at a sputtering pressure of 2 Pa were polycrystalline in nature with mixed phase of α- and β-phase MoO3, while those formed at sputtering pressure of 4 Pa and above were of α-phase MoO3. Scanning electron micrographs showed a decrement in the size of the particles and their shapes changed from needle like structure to dense films with the increase of sputtering pressure. Fourier transform infrared spectroscopic studies confirmed the presence of characteristic vibration modes of Mo=O, Mo–O and Mo–O–Mo related to MoO3. Electrical resistivity of the MoO3 films decreased from 6.0 × 104 Ω cm to 2 × 104 Ω cm with an increase of sputtering pressure from 2 Pa to 6 Pa, respectively. Optical band gap of the films decreased from 3.12 eV to 2.86 eV with the increase of sputtering pressure from 2 Pa to 6 Pa, respectively.

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Coloration of molybdenum oxide thin films synthesized by spray pyrolysis technique

Cited by 24 publications

References 29 publications

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Molybdenum oxide nanocolloids prepared by an external field-assisted laser ablation in water

Sputtering pressure influenced structural, electrical and optical properties of RF magnetron sputtered MoO₃ films

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Coloration of molybdenum oxide thin films synthesized by spray pyrolysis technique

Cited by 24 publications

References 29 publications

Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation

Molybdenum oxide nanocolloids prepared by an external field-assisted laser ablation in water

Sputtering pressure influenced structural, electrical and optical properties of RF magnetron sputtered MoO3 films

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Product

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Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Sputtering pressure influenced structural, electrical and optical properties of RF magnetron sputtered MoO₃ films