A Simple Process for Synthesis of Transparent Thin Films of Molybdenum Trioxide in the Orthorhombic Phase (α-MoO3)

Chibane, Loundja; Belkaid, Mohammed Saïd; Zirmi, Rachid; Moussi, A.

doi:10.1007/s11664-016-5239-1

Cited by 22 publications

(18 citation statements)

References 51 publications

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“…achieved a bandgap of 3.35 eV for the α‐MoO 3 films deposited by a spray pyrolysis technique. Herein, the optical bandgap of such a film sample exhibits a blue shift compared to the bulk value of α‐MoO 3 single crystals (≈2.9 eV), that is well consistent with several previous works . Furthermore, the bandgap width was observed to be decreased by increasing the α‐MoO 3 film thickness, that is, mainly originated from the increase in the particle size and the crystallinity enhancement.…”

Section: Resultssupporting

confidence: 91%

“…The above‐mentioned values are well consistent with those obtained by Chibane et al., whereas they have prepared transparent α‐MoO 3 thin films by sol–gel dip coating technique after post‐annealing at 350 °C. Comparable values of the optical bandgap have been previously reported in several works, since the bandgap width depends mainly on the starting materials and the deposition conditions.…”

Section: Resultssupporting

confidence: 90%

“…It is also revealed from Figure that the optical transmission decreases by increasing the film thickness, and the intense changes in transmission were observed in the long‐wavelength region. The lowering of the optical transmittance by the increase in the film thickness may be due to the larger particle size . Whereas, the particle growth enhancement due to the increase in the film thickness is well consistent with the experimental observations obtained by the analysis of both the XRD patterns and the SEM micrographs.…”

Section: Resultssupporting

confidence: 89%

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Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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A modified spray pyrolysis technique is used for preparing α‐MoO3 thin films after subsequent heat treatment at a relatively low temperature. The spray parameters are selected through a wide variety of elaboration conditions for best photochromic features. Different numbers of spraying and drying cycles are performed to investigate the thickness effect on the structural, morphological, optical, electrical, and photo‐electrical properties of the nanostructured α‐MoO3 films. These film samples are characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM), and thus the film thickness effect is elucidated and correlated to the crystallite shape and size. The SEM micrographs show fibrous‐reticulated morphology for all the film samples investigated here. The photochromic properties of α‐MoO3 sprayed thin films are investigated by measuring the transmission spectra before and after UV‐light exposure. The changes in the optical transmission of these film samples are monitored for different exposure times. The UV exposure time effect as well as the thickness effect on the photochromic response of the film samples is investigated and discussed based on the particle size analysis. The photosensitivity is evaluated in various illumination levels to elucidate the carrier transport in the α‐MoO3 films and to determine the type of the recombination processes in these films.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

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Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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“…The bands at 573.2 cm −1 and 688 cm −1 were assigned to the bending vibration of O atoms in Mo-O-Mo units. Chibane et al[31] have reported the similar…”

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confidence: 67%

Thickness dependent structural, morphological and optical properties of molybdenum oxide thin films

Kumari

Singh

et al. 2020

SN Appl. Sci.

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Molybdenum oxide ( MoO 3 ) is a chromogenic and a wide band gap n-type semiconductor. Thickness of thin films is usually observed to have significant influence on various properties of chromogenic materials. MoO 3 thin films of different thicknesses (100 nm, 200 nm and 400 nm) were deposited on glass substrates by thermal evaporation technique. The effect of thickness of deposited thin films on the structural, morphological and optical properties was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM) and UV-visible spectroscopy. XRD analysis revealed the amorphous nature of deposited thin films of different thicknesses. FTIR spectrum showed the characteristic vibrations of intermolecular bonds in molybdenum oxide. The surface morphology of MoO 3 films showed nanoflakes like structures which became densely stacked with increase in film thickness and transformed to large grains with uniform coverage of the substrate surface with randomly oriented morphology. The transmission spectra revealed the slight increase in average transmittance in the visible-NIR region with increase in thickness of thin films. The optical band gap of the deposited thin films of different thicknesses was found to be increasing with increase in thickness of the films which may be attributed to decreased defect centres. The decrease in the values of Urbach energy with increase in thickness may be due to the increased homogeneity and decrease in scattering centres.

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“…The FTIR spectrum of the pure MoO 3 film shows the absorption bands at 545, 648, 773, 816, 854, 874, 888, 928, and 988 cm –1 . The bands at 545, 816, and 854 cm –1 correspond to the bending of O-atoms in Mo–O–Mo units. , The bands at 874, 888, 928, and 988 cm –1 represent the stretching of MoO bond, while the peak at 773 cm –1 is attributed to the Mo–O stretching vibration. , The band at 648 cm –1 is assigned to the stretching vibration of O-atoms bonded with three metal atoms …”

Section: Resultsmentioning

confidence: 99%

Charge Coupling Enhanced Photocatalytic Activity of BaTiO₃/MoO₃ Heterostructures

Alex

Prabhakaran

Jayakrishnan

et al. 2019

ACS Appl. Mater. Interfaces

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In this work, we proposed an efficient heterostructure photocatalyst by integrating the ferroelectric BaTiO3 (BTO) layer with the semiconductor MoO3 layer, availing the ferroelectric polarization of BaTiO3 and high generation of photoinduced charge carriers in the MoO3 layer. The effect of MoO3 layer thickness (t MoO3 ) on the photocatalytic efficiency of the BTO/MoO3 heterostructures is found to be optimum at t MoO3 = 67 nm as t MoO3 varies from 40 to 800 nm. The BTO/MoO3 heterostructure with t MoO3 = 67 nm exhibits a high efficiency of 86% for the degradation of rhodamine B (RhB) under the exposure of UV–visible light for 60 min. The photocatalysis rate kinetics analysis reveals that the rate constant in the heterostructure is 1.7 times of pure BTO and 3.2 times of pure MoO3 films. The enhanced photocatalytic activity in the heterostructures is attributed to the electric field-driven carrier separation due to the ferroelectric polarization and the heterojunction band bending. The charge coupling effect between BaTiO3 and MoO3 is evident from the current–voltage characteristics. The maximum lattice strain in the heterostructure with t MoO3 = 67 nm as evident from X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and photoluminescence (PL) analysis further confirms the charge transfer between the layers. The degradation as well as decolorization efficiency of the BTO/MoO3 heterostructure is higher than that of pure BTO and MoO3 films. Radical trapping experiments reveal that electrons are the major contributors to the photocatalytic activity of the BTO/MoO3 heterostructure. The reusability test shows only a reduction of 5% in the efficiency of the heterostructure after five photocatalysis cycles. The heterostructure can also efficiently decompose the other dyes such as rose bengal and methyl violet. Thus, our findings prove that an efficient and reusable photocatalyst can be designed through the integration of the ferroelectrics with the semiconductor layers.

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A Simple Process for Synthesis of Transparent Thin Films of Molybdenum Trioxide in the Orthorhombic Phase (α-MoO3)

Cited by 22 publications

References 51 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Thickness dependent structural, morphological and optical properties of molybdenum oxide thin films

Charge Coupling Enhanced Photocatalytic Activity of BaTiO₃/MoO₃ Heterostructures

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A Simple Process for Synthesis of Transparent Thin Films of Molybdenum Trioxide in the Orthorhombic Phase (α-MoO3)

Cited by 22 publications

References 51 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Thickness dependent structural, morphological and optical properties of molybdenum oxide thin films

Charge Coupling Enhanced Photocatalytic Activity of BaTiO3/MoO3 Heterostructures

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Product

Resources

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Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Charge Coupling Enhanced Photocatalytic Activity of BaTiO₃/MoO₃ Heterostructures