Liquid phase deposition synthesis of hexagonal molybdenum trioxide thin films

Deki, Shigehito; Béléké, Alexis Bienvenu; Kotani, Yuki; Mizuhata, Minoru

doi:10.1016/j.jssc.2009.06.033

Cited by 43 publications

(14 citation statements)

References 49 publications

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“…It is not always possible to obtain the crystals of the α-МоО 3 phase with such a texture by other methods, even aiming at this goal. When studying h-МоО 3 films, S. Deki with colleagues observed a similar effect [40]. The keeping of crystals at T = 650 °C, close to the sublimation temperature, resulted in their recrystallization with the formation of α-МоО 3 crystals (according to the powder XRD data) with a typical platelet shape and a flat surface (Fig.…”

Section: Resultsmentioning

confidence: 66%

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

et al. 2015

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Thermal transformations of the crystal structure and composition of the h-MoO 3 metastable phase with a transition to the α-МоО 3 stable modification are investigated. The study is performed using submicron phase-pure crystals exhibiting stability during their long storage in the air. By powder XRD, SEM, TGA, CHN, LMS, Raman and IR spectroscopy it is found: the composition of the deposited crystals is expressed by the general formula МоО 3 ⋅0.26H 2 O; the impurity cationic composition consists of 1.8 wt.% of ammonia groups and a sum of 15 elements detected at a level of 10 -4 wt.%. Thermal treatment of the crystals to T = 350 °C in the air results in the removal of adsorbed and structural water, ОН -, and 4 NH + groups with retaining the h-phase of hygroscopic МоО 3 ⋅0.08H 2 O. The h-МоО 3 ⋅0.08H 2 O crystals obtained show instability during the storage and transform into the α-МоО 3 stable modification. At T = 380 °C the h → α phase transition occurs with the removal of coordinated water and texture transformations resulting in the formation of α-МоО 3 hygroscopic crystals that at T = 650 °C acquire the platelet shape characteristic of the α-phase.

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Section: Resultsmentioning

confidence: 66%

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

et al. 2015

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“…MoO 3 is one of the transition metal oxide materials. It has a wide range of applications such as imaging devices, smart windows, electrodes of rechargeable batteries, gas sensors, and supported catalysts [1]. Since MoO 3 is a 3.15 eV wide band gap n-type semiconductor, it is well known as one of the most widely used photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…But for -MoO 3 , it has a ReO 3 -related structure, in which the MoO 6 octahedrons share corners to form distorted cubes. The h-MoO 3 is also composed of the same zigzag chains of MoO 6 octahedrons connecting through the cispositions [1,4]. Moreover, h-MoO 3 exhibits phase stability up to 436 ∘ C at which the irreversible phase transition occurs to form orthorhombic -MoO 3 [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of h‐ and α‐MoO₃ by Refluxing and Calcination Combination: Phase and Morphology Transformation, Photocatalysis, and Photosensitization

Wongkrua

Thongtem

2013

Journal of Nanomaterials

108

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Hexagonal molybdenum oxide (h-MoO3) nano- and microrods were successfully synthesized by refluxing of (NH4)6Mo7O24·4H2O solutions with the pH 1 at 90°C for 1, 3, 5, and 7 h and were further transformed into orthorhombic molybdenum oxide (α-MoO3) microplates by calcination at 450°C for 6 h. These selected products were used to determine the degradation of methylene blue dye under 35 W xenon lamp for 0–180 min, due to the photocatalysis and photosensitization processes. In this research, catalytic activity of the metastable h-MoO3has higher efficiency than that of the thermodynamically stableα-MoO3. Their phase and morphology transformation was also explained according to the experimental results.

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“…The binding energies of all other elements were calibrated using C 1S peak. The Mo 3d core level spectrum of as synthesized h-MoO 3 shows doublets at 235.12eV and 232.05 eV from Figure 8b [40] which is attributed to B.E. of the 3d 3 and 3d 5 orbital electrons of Mo 6+ .…”

Section: Compositional Analysismentioning

confidence: 94%

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

Desai¹,

Mali²,

Kondalkar³

et al. 2015

J Nanomed Nanotechnol

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In the present investigation, sea urchin like morphology of h-MoO 3 nanorods are successfully synthesized by chemical bath deposition (CBD) technique. The thermal stability, structural details, morphology and compositional analysis of MoO 3 was done using thermogravimetry (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) techniques respectively. The thermal analysis reveals presence of sharp exothermic peak at 409ºC indicating irreversible phase transition. X-ray diffraction pattern showed hexagonal to orthorhombic phase transition after annealing at 450ºC. As synthesized h-MoO 3 shows well oriented hexagonal rods with sea urchin like architecture while that of annealed MoO 3 sample revealed 2D layer by layer growth. The SAED pattern confirms single crystalline nature of as synthesized h-MoO 3 and polycrystalline nature of annealed α-MoO 3 . While XPS study of both confirms Mo +6 and O 2-oxidation states of elements. Furthermore, characteristic antibacterial properties of h-MoO 3 and α-MoO 3 against gram positive Bacillus megaterium, Streptococcus aureus and gram negative Escherichia coli is noted.

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Liquid phase deposition synthesis of hexagonal molybdenum trioxide thin films

Cited by 43 publications

References 49 publications

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

Synthesis of h‐ and α‐MoO₃ by Refluxing and Calcination Combination: Phase and Morphology Transformation, Photocatalysis, and Photosensitization

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

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Liquid phase deposition synthesis of hexagonal molybdenum trioxide thin films

Cited by 43 publications

References 49 publications

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

Thermal transformations of the composition and structure of hexagonal molybdenum oxide

Synthesis of h‐ and α‐MoO3 by Refluxing and Calcination Combination: Phase and Morphology Transformation, Photocatalysis, and Photosensitization

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

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Synthesis of h‐ and α‐MoO₃ by Refluxing and Calcination Combination: Phase and Morphology Transformation, Photocatalysis, and Photosensitization