Figure - available from: Research on Chemical Intermediates
This content is subject to copyright. Terms and conditions apply.
Source publication
In the present work, sheet-like α-MoO3 nanostructures (NS) were prepared by a simple hydrothermal method using ammonium heptamolybdate tetrahydrate as a molybdenum source and nitric acid. The synthesized α-MoO3 NS have been characterized structurally and morphologically using various analytical techniques. The PXRD, FT-IR, Raman and XPS spectroscop...
Similar publications
In this study, we report a simple technique for the pyrofabrication of a novel photocatalyst of titanium dioxide quantum dots‐kaolinite nanocomposite (TiO2‐QDs‐Kao) used for rhodamine B (RhB) dye degradation. The photocatalyst was characterized by using different analytical techniques, including XRD, XRF, XPS, FTIR, DTA/TGA, SEM–EDX, TEM, BET, BJH,...
Citations
... Molybdenum nanoparticles are used to obtain stable bimetallic catalysts [10,11], and the use of such systems increases the efficiency of catalysts due to the synergistic effect. It should be noted that molybdenum-containing nanoparticles are characterized by a core-shell structure and various forms of molybdenum trioxide, which is part of the shell, have several important properties: -MoO 3 is an n-type semiconductor with a wide bandgap (3.2 eV) [12]; -MoO 3 is a photochromic material [13,14]; -MoO 3 is widely used in industrial catalysis [15,16]; -nano-sized MoO 3 can be used as cathodes in lithium-ion batteries [17]; ...
Molybdenum-containing composite nanomaterials are synthesized by the thermal decomposition of molybdenum hexacarbonyl in a solution-melt of polyethylene in mineral oil. The concentration of a metal-containing filler in the composite materials varied from 1 to 20 wt %. A technique for preparing film samples for spectroscopic studies is developed, and the samples obtained are studied by UV, IR, and Raman spectros-copy. It is found that additional absorption bands appear in the IR range, whose intensity depends on the concentration of molybdenum-containing nanoparticles in the composite materials. The spectral characteristics of Raman scattering show that all samples are characterized by the stretching of the CC bond. In the visible light region, the spectrum of nanocomposites has a flat edge of its own absorption located in the region of wave numbers (18-31) × 10 3 cm-1 .
... The oxides of transition metals have become a remarkable and rapidly growing research area in widening the interconnection between physical and engineering sciences [1]. Nanostructure materials show various exciting physical phenomena in different scales of the building block advancements, such as the dimension effect, catalytic, quantum conductance and coulomb blockades [2][3][4]. Nanowires are one of these building blocks that possess several distinct and practical properties, such as a well-controlled dimensional composition, electronic radial transport, and crystallinity; this helps to organize the nanoscale building blocks into assemblies and, ultimately, to useful systems. ...
Transition metal oxides are found to have overwhelming applications in energy, electronics, catalytic, and bio- and micromechanical systems. A recent report emphasized the current advancements in molybdenum oxide (MoOx) nanowire synthesis and the corresponding surface-functionalized nanostructured materials based on our previously reported investigations. The preparation of the nanowires and their applications were systematically summarized. MoOx nanowires combined with substrates exhibited remarkable performances for high energy storage and power densities with high stability. In addition, the review concluded the future advancements of MoOx nanowires.
... Sheet-like orthorhombic α-MoO 3 nanostructures are usually prepared by a simple hydrothermal method using ammonium heptamolybdate tetrahydrate and nitric acid [8,9], although both liquidand vapor-phase-based alternative approaches have been devised for synthesizing and depositing this oxide. Actually, sputtering is now the most commonly used technique for industrial scale deposition of well-defined, large-area crystalline films of molybdenum oxide [10,11]. ...
Transition metal oxides and chalcogenides have recently attracted great attention as the next generation of 2-D materials due to their unique electronic and optical properties. In this study, a new procedure for the obtaining of highly crystalline α-MoO3 is proposed as an alternative to vapor-phase synthesis. In this approach, a first reaction between molybdate, citrate and thiourea allowed to obtain MoS2, which—upon calcination at a temperature of 650 °C in the presence of g-C3N4—resulted in MoO3 with a definite plate-like shape. The colorless (or greenish) α-MoO3 nanoplates obtained with this procedure featured a multilayer stack structure, with a side-length of 1–2 μm and a thickness of several nanometers viewed along the [010] direction. The nucleation-growth of the crystal can be explained by a two-dimensional layer-by-layer mechanism favored by g-C3N4 lamellar template.
... Thus, it is very important to find the cheap, earth abundant and visible-light photocatalyst for large scale dye removal applications. Recently, numerous efforts were made to synthesize the semiconductor metal oxides/sulfides/nitrides/phosphides and their composites for photocatalytic applications [8][9][10][11]. Among the different metal oxides, zinc oxide (ZnO), n-type semiconductor, has been identified as the promising material and it can be effectively used for diverse applications such as solar cells, sensors, photo detectors and field emission devices due to its distinctive properties such as high electron mobility, low-cost, non-toxicity, large surface area and good chemical stability [12][13][14][15][16]. Recently, ZnO based nanocomposite has attracted for light harvesting efficiency and fast electron transport in dye sensitized solar cell application [17]. ...
... Whereas, the vibrational bands that correspond to ZnO NPs in the ZnO-MoS 2 composite are detected around at 562 cm −1 . The band at 3447 cm −1 in the composite is attributed to the stretching vibration of the adsorbed water molecules[10]. In addition, the stretching vibrational frequency for MoS 2 was also observed for ZnO-MoS 2 composite as well. ...
... The peak at 666 cm −1 is due to the stretching vibration of triply coordinated oxygen atoms [40,41]. The peaks at 284 and 293 cm −1 are attributed to the MoeOeMo wagging vibrations for sample 1 and sample 2, respectively [42]. Additionally, obtained small peaks are represents the synthesized α-MoO 3 nanostructures have highly crystalline quality with excellent structural order. ...
Molybdenum-containing composite nanomaterials are synthesized by the thermal decompositionof molybdenum hexacarbonyl in a solution-melt of polyethylene in mineral oil. The concentration of a metalcontainingfiller in the composite materials varied from 1 to 20 wt %. A technique for preparing film samplesfor spectroscopic studies is developed, and the samples obtained are studied by UVI, IR, and Raman spectroscopy.It is found that additional absorption bands appear in the IR range, whose intensity depends on theconcentration of molybdenum-containing nanoparticles in the composite materials. The spectral characteristicsof Raman scattering show that all samples are characterized by the stretching of the C–C bond. In thevisible light region, the spectrum of nanocomposites has a flat edge of its own absorption located in the regionof wave numbers (18–31) × 103 cm–1.
Molybdenum trioxide (MoO3) photocatalyst is attracting widespread attention in the field of photocatalysis with prominent applications to combat energy and environmental issues owing to its high chemical and thermal stability, and non-toxic nature, and wide specific surface area. However, the weak visible-light absorption capability of the MoO3 photocatalyst constrains its further progress, primarily because of the sluggish charge transference mechanism. The design of the Z-scheme heterostructure has prominently enhanced the photocatalytic performance of MoO3 by improving the charge transfer pathway and visible-light utilization. The present review succinctly underlines the in-depth mechanism of Z-schemes and explains the crystal and electronic structure of MoO3. After, a comprehensive discussion of Z-scheme (ASS and direct) and s-scheme-based MoO3 supported metal oxide, g-C3N4, metal sulfides, Ag-based materials, and metal-organic frameworks are summarized. Finally, a conclusive remark is presented concerning current research gaps and future perspectives for the advancements in emerging highly effectual MoO3-based composites.
Because of its unique physical and chemical characteristics, such as excellent electrical conductivity, wide-range light absorption, and strong chemical adsorption, graphene was used to couple with the MoO3 films prepared by anodization followed by annealing to improve their photocatalytic performance using a novel thin-film composite method, called the wetting-induced climbing method. These composite films were analyzed by XRD, SEM, XPS, UV–vis spectroscopy, and EIS spectra. The XRD, SEM, and XPS analysis results show that the graphene/MoO3 composite films were prepared. The light absorption capacity of these composite films was greatly enhanced. The bandgap values were decreased due to the graphene coupling and crystal defects in the MoO3 films. The EIS spectra indicate that the photogenerated charge carriers were easier to transfer to the coupled graphene, which worked as the acceptor and transferred medium of photo-induced electrons owing to the graphene coupling. The graphene coupling amount has a moderate and optimum value to improve photocatalytic activity. Too many graphene platelets would shield the greater surface area of MoO3 films and thus reduce the number of photo-inspired carriers, leading to fewer oxidizing species. The number reduction of graphene layers has no positive effect on improving photocatalytic activity. The photocatalytic activity of the graphene/MoO3 composite films is 2.62 times that of the individual MoO3 films.
