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Journal articles on the topic 'Mesoporous amorphous WO3 (a-WO3)'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Shang, Fu Liang, Hai Tao Yang, Wei Lin Lin, and Ling Gao. "Preparation and Electrochromic Properties of Mesoporous WO₃ Film." Advanced Materials Research 79-82 (August 2009): 867–70. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.867.

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The WO3 film was prepared by dip coating method with WCl6 as the soure of tungsten and P123 as the structure-directing agent. The crystalline phase and microstructure of the film were characterized through XRD and TEM techniques, respectively. It was found the film annealed at 300°C for 4h mainly was amorphous WO3 with a little monoclinic WO3. The TEM micrographs revealed the film was partly ordered mesoporous and the mean pore diameter was about 5nm. The measurements of the cyclic voltammetry suggested that the WO3 film had a good electrochromic reversibility performance. The ratio of amount

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2

Zou, Yidong, Shibo Xi, Tao Bo, et al. "Mesoporous amorphous Al2O3/crystalline WO3 heterophase hybrids for electrocatalysis and gas sensing applications." Journal of Materials Chemistry A 7, no. 38 (2019): 21874–83. http://dx.doi.org/10.1039/c9ta08633a.

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Unprecedented mesoporous amorphous–crystalline Al<sub>2</sub>O<sub>3</sub>/WO<sub>3</sub> exhibit superior HER activity with addition of Al<sub>2</sub>O<sub>3</sub> (>2%) while lower contents (<2%) show excellent sensing performance owing to hetero-interface and lattice distortion of the octahedron crystal.

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3

Fuku, Kojiro, Yuta Miyase, Yugo Miseki, Takahiro Gunji, and Kazuhiro Sayama. "WO3/BiVO4 photoanode coated with mesoporous Al2O3 layer for oxidative production of hydrogen peroxide from water with high selectivity." RSC Adv. 7, no. 75 (2017): 47619–23. http://dx.doi.org/10.1039/c7ra09693c.

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A mesoporous and amorphous Al<sub>2</sub>O<sub>3</sub> layer coated on WO<sub>3</sub>/BiVO<sub>4</sub> photoanode significantly facilitated inhibiting the oxidative degradation of generated H<sub>2</sub>O<sub>2</sub> into O<sub>2</sub> on the photoanode, resulting in the achieving excellent H<sub>2</sub>O<sub>2</sub> selectivity.

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4

Zhang, Yinhai, Xiaoxue Liu, Ruyu Zhao, et al. "The Green Preparation of Mesoporous WO3/SiO2 and Its Application in Oxidative Desulfurization." Catalysts 14, no. 2 (2024): 103. http://dx.doi.org/10.3390/catal14020103.

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Recently, supported WO3-based catalysts have been widely used in oxidative desulfurization (ODS) due to their advantages of easy separation, high activity, and being environment-friendly. In this work, supported mesoporous WO3/SiO2 catalysts have been prepared using an incipient-wetness impregnation method with agricultural waste rice husks as both a silicon source and mesoporous template, and phosphotungstic acid as a tungsten source. The effects of different calcination temperatures and WO3 loadings on the ODS performance of samples are studied, and the appropriate calcination temperature an

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5

Zhang, Cheng, Chuning Jiang, Xiaohong Zheng, and Xin Hong. "Medium-Low-Temperature NO2 Sensor Based on YSZ Solid Electrolyte and Mesoporous WO3 Sensing Electrode for Detection of Vehicle Emissions." Nano 16, no. 07 (2021): 2150083. http://dx.doi.org/10.1142/s1793292021500831.

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A mixed potential-type NO2 sensor was fabricated using yttria-stabilized zirconia (YSZ) as the electrolyte and mesoporous WO3 as the sensing electrode for the detection of NO2 in vehicle exhausts. The mesoporous WO3 with a diameter of 7 nm was synthesized using the hard template method. The sensor showed excellent performance in the detection of 30–500[Formula: see text]ppm of NO2 at 300∘C and 500∘C. However, commercial WO3 only operate well at 500∘C. The response of the mesoporous WO3 was higher and the test temperature was lower compared to that of commercial WO3. XPS combined with NO2-TPD w

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6

Cruz-Leal, M., O. Goiz, F. Chávez, et al. "Study of the Thermal Annealing on Structural and Morphological Properties of High-Porosity A-WO3 Films Synthesized by HFCVD." Nanomaterials 9, no. 9 (2019): 1298. http://dx.doi.org/10.3390/nano9091298.

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High-porosity nanostructured amorphous tungsten OXIDE (a-WO3) films were synthesized by a Hot Filament Chemical Vapor Deposition technique (HFCVD) and then transformed into a crystalline WO3 by simple thermal annealing. The a-WO3 films were annealed at 100, 300, and 500 °C for 10 min in an air environment. The films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and UV–vis spectroscopy. Results revealed that the a-WO3 films were highly porous, composed of cauliflower-like st

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7

Liang, Yuan-Chang, and Che-Wei Chang. "Preparation of Orthorhombic WO3 Thin Films and Their Crystal Quality-Dependent Dye Photodegradation Ability." Coatings 9, no. 2 (2019): 90. http://dx.doi.org/10.3390/coatings9020090.

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Direct current (DC) magnetron sputtering deposited WO3 films with different crystalline qualities were synthesized by postannealing at various temperatures. The in-situ DC sputtering deposited WO3 thin film at 375 °C exhibited an amorphous structure. The as-grown WO3 films were crystallized after annealing at temperatures of 400–600 °C in ambient air. Structural analyses revealed that the crystalline WO3 films have an orthorhombic structure. Moreover, the crystallite size of the WO3 film exhibited an explosive coarsening behavior at an annealing temperature above 600 °C. The density of oxygen

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8

de Wijs, G. A., and R. A. de Groot. "Amorphous WO3: a first-principles approach." Electrochimica Acta 46, no. 13-14 (2001): 1989–93. http://dx.doi.org/10.1016/s0013-4686(01)00377-2.

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9

Brei, V. V., O. V. Melezhyk, S. V. Prudius, G. M. Tel'biz, and O. I. Oranska. "Study of the Acid Site Structure on the WO3/ZrO2 Surface." Adsorption Science & Technology 23, no. 2 (2005): 109–14. http://dx.doi.org/10.1260/0263617054037754.

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The IR and UV—vis diffuse reflectance spectra of mesoporous WO3/ZrO2 are discussed and a scheme proposed for the acid site structure on the WO3/ZrO2 surface. The high Brönsted acidity of WO3/ZrO2 (H0 ≤ −11.38) can be explained by the formation of large zirconium polytungstate species such as [≡ Zr61/2+W66+O202−]− H+ on the WO3/ZrO2 surface.

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10

Zhang, Guanguang, Kuankuan Lu, Xiaochen Zhang, et al. "Effects of Annealing Temperature on Optical Band Gap of Sol-gel Tungsten Trioxide Films." Micromachines 9, no. 8 (2018): 377. http://dx.doi.org/10.3390/mi9080377.

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Tungsten trioxide (WO3) is a wide band gap semiconductor material that is used as an important electrochromic layer in electrochromic devices. In this work, the effects of the annealing temperature on the optical band gap of sol-gel WO3 films were investigated. X-ray Diffraction (XRD) showed that WO3 films were amorphous after being annealed at 100 °C, 200 °C and 300 °C, respectively, but became crystallized at 400 °C and 500 °C. An atomic force microscope (AFM) showed that the crystalline WO3 films were rougher than the amorphous WO3 films (annealed at 200 °C and 300 °C). An ultraviolet spect

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11

Luo, Jian Yi, Run Ming Chen, Yang Yang Zhou, Ri Mei Chen, Wei Yuan Deng, and Li Li. "Double-Side Digital Display Devices Based on the Solid-State Electrochromic Effect of the Amorphous WO₃ Thin Films." Advanced Materials Research 529 (June 2012): 74–78. http://dx.doi.org/10.4028/www.scientific.net/amr.529.74.

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A double-side digital display device has been fabricated based on the solid-state electrochromic effect of amorphous WO3 thin film in this article. The device simply consists of a transparent anode, a transparent cathode, an amorphous WO3 thin film and a solid electrolyte. The transparent electric wiring has been achieved by the electrochemical corrosion of the designed region of ITO (indium tin oxide) film. The amorphous WO3 thin film as an electrochromic layer is prepared on the ITO film by thermal evaporation deposition. The complex of polyethylene and LiClO4 as a solid electrolyte is used

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12

Chu, Xuefeng, Kunjie Lin, Haiyang Zhao, et al. "Biphasic WO3 Nanostructures via Controlled Crystallization: Achieving High-Performance Electrochromism Through Amorphous/Crystalline Heterointerface Design." Crystals 15, no. 4 (2025): 324. https://doi.org/10.3390/cryst15040324.

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WO3 electrochromic films have emerged as potential candidates for smart windows due to their cost-effectiveness, fast switching speed, and strong chemical stability. However, the inherent contradiction between the high coloring efficiency of amorphous WO3 and the cycling durability of crystalline WO3 remains a critical challenge in practical applications. This study proposes an innovative heterostructure engineering strategy, achieving precise control of the amorphous/crystalline bilayer WO3 heterointerface (148 nm a-WO3/115 nm c-WO3) for the first time through phase boundary regulation, using

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13

Xia, Zhu-jie, Hong-li Wang, Yi-fan Su, et al. "Enhanced Electrochromic Properties by Improvement of Crystallinity for Sputtered WO3 Film." Coatings 10, no. 6 (2020): 577. http://dx.doi.org/10.3390/coatings10060577.

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Tungsten oxide (WO3) is widely used as a functional material for “smart windows” due to its excellent electrochromic properties, however it is difficult to overcome the conflict between its optical modulation and cyclic stability. In this work, WO3 thin films with different crystal structures were prepared by DC reactive magnetron sputtering method. The effects of substrate temperature on the structure, composition, and electrochromic properties of WO3 films were investigated. The results show that the crystallinity of the WO3 film increases with increasing deposition temperature, indicating t

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14

Song, Ya, Zhiyu Zhang, Lamei Yan, et al. "Electrodeposition of Ti-Doped Hierarchically Mesoporous Silica Microspheres/Tungsten Oxide Nanocrystallines Hybrid Films and Their Electrochromic Performance." Nanomaterials 9, no. 12 (2019): 1795. http://dx.doi.org/10.3390/nano9121795.

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In this paper, a novel Ti-doped hierarchically mesoporous silica microspheres/tungsten oxide (THMS/WO3) hybrid film was prepared by simultaneous electrodeposition of Ti-doped hierarchically mesoporous silica microspheres (THMSs) and WO3 nanocrystallines onto the fluoride doped tin dioxide (FTO) coated glass substrate. It is demonstrated that the incorporation of THMSs resulted in the hybrid film with improved electrochromic property. Besides, the content of THMSs plays an important role on the electrochromic property of the hybrid film. An excellent electrochromic THMS/WO3 hybrid film with goo

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15

Amer, Mabrook S., Prabhakarn Arunachalam, Abdullah M. Al-Mayouf, Saradh Prasad, Matar N. Alshalwi, and Mohamed A. Ghanem. "Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction." Nanomaterials 9, no. 10 (2019): 1502. http://dx.doi.org/10.3390/nano9101502.

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Nanostructured photoanodes are attractive materials for hydrogen production via water photo-electrolysis process. This study focused on the incorporation of carbon quantum dots doped with nitrogen as a photosensitizer into mesoporous tungsten trioxide photoanodes (N-CQD/meso-WO3) using a surfactant self-assembly template approach. The crystal structure, composition, and morphology of pure and N-CQD- modified mesoporous WO3 photoanodes were investigated using scanning electron and transmission microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Due to their high surface area, e

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16

Ahmadi, Ehsan, Mustaffa Ali Azhar, Dede Miftahul Anwar, Monna Rozana, and Zainovia Lockman. "The Effect of Crystallinity of Nanoporous WO₃ on the Intercalation and Deintercalation of Li⁺." Advanced Materials Research 1024 (August 2014): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amr.1024.128.

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Nanoporous anodic WO3 was annealed at three different times of 1h, 2h, and 3h at a constant temperature of 500oC. This was to investigate the intercalation and deintercalation behaviour of Li+ in this annealed nanoporous oxide. The as-anodised WO3 is amorphous and after annealing, monoclinic WO3 was observed with much higher degree of crystallinity when the time of annealing was increased from 1h to 3h. By electrodiffusion of Li+ in the nanoporous structure, an ion exchange between fully oxidized states (W6+) which is the octahedral coordination dominates (WO6) and Li+ could happen. This cause

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17

Filipescu, Mihaela, Stefan Dobrescu, Adrian Ionut Bercea, et al. "Polypyrrole–Tungsten Oxide Nanocomposite Fabrication through Laser-Based Techniques for an Ammonia Sensor: Achieving Room Temperature Operation." Polymers 16, no. 1 (2023): 79. http://dx.doi.org/10.3390/polym16010079.

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A highly sensitive ammonia-gas sensor based on a tungsten trioxide and polypyrrole (WO3/PPy) nanocomposite synthesized using pulsed-laser deposition (PLD) and matrix-assisted pulsed-laser evaporation (MAPLE) is presented in this study. The WO3/PPy nanocomposite is prepared through a layer-by-layer alternate deposition of the PPy thin layer on the WO3 mesoporous layer. Extensive characterization using X-ray diffraction, FTIR and Raman spectroscopy, scanning electron microscopy, atomic force microscopy, and water contact angle are carried out on the as-prepared layers. The gas-sensing properties

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18

Zhang, Qiyuan, Ruoming Du, and Aihua Yao. "Cathodic electrodeposition of amorphous tungsten oxide dihydrate film for dual-band electrochromic modulation." RSC Advances 15, no. 7 (2025): 5242–51. https://doi.org/10.1039/d4ra08851d.

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Amorphous WO3·2H2O films were electrodeposited from a monomeric diperoxotungstate solution derived from [WO2(O2)H2O]·1.66H2O powder. The open framework and interlayer water in WO3·2H2O enable outstanding dual-band electrochromic performance.

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19

Abdullah, S. A., Nayan Nafarizal, and Mohd Zainizan Sahdan. "Influence of Oxygen Flow Rate on the Characteristics of the Tungsten Oxide Using RF Magnetron Sputtering." Applied Mechanics and Materials 773-774 (July 2015): 657–61. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.657.

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—Tungsten Oxide (WO3) thin films were deposited using 99.9% pure tungsten target onto ITO substrate using RF magnetron sputtering in the range oxygen flow rates of 30-50%. The influence of the oxygen flow rate on characteristic of WO3 thin films has been investigated. The transmittance, resistivity, crystallite, roughness, and surface morphology were measured by UV-Vis, 2-point probe, X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), and Field Emission Scanning Electron Microscopy (FE-SEM) respectively. Experimental result showed that the deposition rate of WO3 thin films decreased by in

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20

Özteki̇n, Ruki̇ye, and Deli̇a Teresa Sponza. "Photocatalytic Degradation of a Herbicide Namely Glyphosate and Hexazinone from the Surface Water which will be Used as Drinking Water via Polyaniline/ZnWO4/WO3 and Evaluation of Acute Toxicity Assays." International Journal of Chemical Engineering and Materials 3 (November 29, 2024): 66–100. http://dx.doi.org/10.37394/232031.2024.3.9.

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Polyaniline/Zinc tungsten oxide/Tungsten trioxide nanocomposites (PANI/ZnWO4/WO3 NCs) was prepared to remove glyphosate (GLP) and Hexazinone (HZN) herbicides from the surface water. The properties of PANI/ZnWO4/WO3 NCs was investigated using XRD, FTIR, FESEM, HRTEM, XPS analyses. The toxicity of NCs and treated wastewater were investigated using Microtox and Daphnia magna acute toxicity tests. The effects of increasing values of PANI/ZnWO4/WO3 NCs concentrations (0.1, 0.4, 0.6, 1.0 and 1.5 mg/l), PANI/ZnWO4/WO3 mass ratios (1:1:3, 1:2:3, 3:1:1 and 3:2:1), GLP concentrations (1, 2, 3 and 4 mg/l

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21

Ling, Chui Min, Chin Chai Teng, Mohd Hayrie Mohd Hatta, and Siew Ling Lee. "TUNGSTEN OXIDE DOPED TITANIA SUPPORTED ON TUD-C FOR PHOTOCATALYTIC REMOVAL OF METHYLENE BLUE." Platform : A Journal of Science and Technology 4, no. 2 (2021): 42. http://dx.doi.org/10.61762/pjstvol4iss2art13217.

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In this work, a series of mesoporous tungsten oxide (WO3) doped titania (TiO2) supported on Technische Universiteit Delft (TUD-C) (WO3-TiO2/TUD-C) were successfully prepared by the sol-gel method. X-ray diffraction (XRD) analysis showed that the samples’ crystallinity decreased after incorporation of WO3-TiO2 onto TUD-C, suggesting the successful incorporating WO3-TiO2 into the framework of TUD-C. N2 adsorption-desorption isotherm analysis indicated that the surface area, pore volume and pore size of WO3-TiO2/TUD-C increased significantly after loading onto TUD-C. The presence of tetrahedron f

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22

Abdullah, S. F., S. Radiman, M. A. Abdul Hamid, and N. B, Ibrahim. "Studies on the phase transitions and properties of tungsten (VI) oxide nanoparticles by X-Ray diffraction (XRD) and thermal analysis." ASEAN Journal on Science and Technology for Development 26, no. 1 (2017): 13–20. http://dx.doi.org/10.29037/ajstd.300.

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Tungsten (VI) oxide, WO3 nanoparticles were synthesized by colloidal gas aphrons (CGAs) technique. The resultant WO3 nanoparticles were characterized by thermogravimetric-differential thermal analysis (TG-DTA) and X-Ray diffraction (XRD) measurements in order to determine the phase transitions, the crystallinity and the size of the WO3 nanoparticles. As a comparison, transmission electron microscope (TEM) was used to investigate the size of the WO3 nanoparticles. The result from XRD and DTA show that the formation of polymorphs WO3 nanoparticles have the following sequence: orthorhombic (bWO3)

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23

Zhou, Dan, Zhibo Tong, Hongmei Xie, Jiaotong Sun, and Fenggui Chen. "Effects of Additives on Electrochromic Properties of Nanocrystalline Tungsten Oxide Films Prepared by Complexation-Assisted Sol–Gel Method." Materials 16, no. 7 (2023): 2681. http://dx.doi.org/10.3390/ma16072681.

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To improve the electrochromic (EC) properties of sol–gel-derived WO3 films, a series of organic small molecules, such as dopamine (DA), catechol, tyramine, phenol and 2-phenylethylamine, were added into peroxotungstic acid precursor sols as structure-directing additives, and five modified WO3 films were prepared by a simple and low-cost complexation-assisted sol–gel method. The effects of the above additives on the EC properties of the modified WO3 films have been studied in detail. Compared with the pure WO3 polycrystalline film, all the modified films combine the advantages of nanocrystallin

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24

Bairamis, Feidias, and Ioannis Konstantinou. "WO3 Fibers/g-C3N4 Z-Scheme Heterostructure Photocatalysts for Simultaneous Oxidation/Reduction of Phenol/Cr (VI) in Aquatic Media." Catalysts 11, no. 7 (2021): 792. http://dx.doi.org/10.3390/catal11070792.

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A sequence of WO3/g-C3N4 composites was synthesized at various % weight ratios (1, 5, 6.5, 8, 10, and 15%) of WO3 into g-C3N4 via electrospinning and wet-mixing method. The prepared photocatalytic materials were characterized by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), N2 porosimetry and dynamic light scattering (DLS). Electrospun fibers of WO3 with diameter 250–300 nm was prepared using polyvinylpyrrolidone (PVP) polymer and used for the synthesis of composite WO3/g-C3N4 heteroju

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25

Li, Hui, Chun-Han Wu, Yi-Cheng Liu, et al. "Mesoporous WO3-TiO2 heterojunction for a hydrogen gas sensor." Sensors and Actuators B: Chemical 341 (August 2021): 130035. http://dx.doi.org/10.1016/j.snb.2021.130035.

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26

Hongo, Teruhisa, Yoshihiro Usami, and Atsushi Yamazaki. "Synthesis and Characterization of Nanostructured Tungsten Oxide by Hard Template Method." Advanced Materials Research 896 (February 2014): 78–81. http://dx.doi.org/10.4028/www.scientific.net/amr.896.78.

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Nanostructured WO3 was synthesized by a hard template method using platelet-shaped mesoporous silica SBA-15. The nanostructured WO3 consisted of nanorod arrays comprised of mixed crystalline tetragonal and monoclinic phases with the diameter of 8.5 nm and the length of 170-300 nm. The specific surface area was 30 m2/g, which was about 6 times higher compared to that synthesized without the template.

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27

Kim, Chang Yeoul, Jin Wook Choi, Tae Yeoung Lim, and Duck Kyun Choi. "Synthesis of WO₃ Electrochromic Sensor by Sol-Gel Method and Characterization of Its Electrochemical and Optical Properties." Key Engineering Materials 317-318 (August 2006): 807–10. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.807.

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Electrochromic WO3 thin film was prepared by using tungsten metal solution in hydrogen peroxide as a starting solution and by sol-gel dip coating method. XRD pattern showed that tungsten oxide crystal phase formed at 400. In the view of electrochemical property, WO3 thin film which was heat-treated at 300 and was amorphous had better than that of the crystalline phase.

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28

Wang, Wenjie, Decai Yang, Yifan Mou, et al. "Construction of 2D/2D Mesoporous WO3/CeO2 Laminated Heterojunctions for Optimized Photocatalytic Performance." Nanomaterials 13, no. 11 (2023): 1798. http://dx.doi.org/10.3390/nano13111798.

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Photocatalytic elimination of antibiotics from the environment and drinking water is of great significance for human health. However, the efficiency of photoremoval of antibiotics such as tetracycline is severely limited by the prompt recombination of electron holes and slow charge migration efficacy. Fabrication of low-dimensional heterojunction composites is an efficient method for shortening charge carrier migration distance and enhancing charge transfer efficiency. Herein, 2D/2D mesoporous WO3/CeO2 laminated Z-scheme heterojunctions were successfully prepared using a two-step hydrothermal

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29

Morankar, Pritam J., Rutuja U. Amate, Mrunal K. Bhosale, and Chan-Wook Jeon. "PVP-Engineered WO3/TiO2 Heterostructures for High-Performance Electrochromic Applications with Enhanced Optical Modulation and Stability." Polymers 17, no. 12 (2025): 1683. https://doi.org/10.3390/polym17121683.

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In response to escalating global energy demands and environmental challenges, electrochromic (EC) smart windows have emerged as a transformative technology for adaptive solar modulation. Herein, we report the rational design and fabrication of a bilayer WO3/TiO2 heterostructure via a synergistic two-step strategy involving the electrochemical deposition of amorphous WO3 and the controlled hydrothermal crystallization of TiO2. Structural and morphological analyses confirm the formation of phase-pure heterostructures with a tunable TiO2 crystallinity governed by reaction time. The optimized WTi-

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30

Cho, Jinill, Hyunho Seok, and Taesung Kim. "Post O₂ Plasma-Induced Fabrication of 1T-WS₂/a-WO₃ Heterostructure for Superior Hydrogen Evolution Reaction Electrocatalysts Via Hydrogen Spillover." ECS Meeting Abstracts MA2023-02, no. 16 (2023): 1157. http://dx.doi.org/10.1149/ma2023-02161157mtgabs.

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2D transition metal dichalcogenide (TMDC) group has been widely spotlighted as hydrogen evolution reaction (HER) electrocatalysts to replace the conventional Pt electrocatalyst due to their distinctive features of robustness, low cost, and accessibility to structural modification. However, the electrochemical activity of TMDC materials is mostly originated from its exposed edge sites, whereas its basal plane is relatively inert. There have been attempts to increase the relative fraction of active edge sites in the basal plane or employ the phase transition from semiconductive 2H phase to metal

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31

Malge, Amarkumar, T. Sankarappa, G. B. Devidas, J. S. Ashwajeet, Ashwini Devidas, and Mohansingh Heerasingh. "Dielectric And Relaxation Studies in Multi Oxides Doped Borotellurite Glasses." IOP Conference Series: Materials Science and Engineering 1221, no. 1 (2022): 012015. http://dx.doi.org/10.1088/1757-899x/1221/1/012015.

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Abstract Melt quenching technique has been adopted to synthesize a set of borotellurite glasses consisting of ZnO, Li2O, WO3 and Dy2O3, with a varied content of WO3. After confirming their amorphous nature by XRD, they were investigated for dielectric properties over a wide range of freqency and temperature. Observed variations in dielectric parameters with frequency, temperarure and composition suggests the presence of mobility of charge carriers, increase of loss due to ionic migration and involvement of dc conductivity. Single phase and conducting nature of the samples have been obtained by

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32

Fominski, Vyacheslav, Alexey Gnedovets, Dmitry Fominski, et al. "Pulsed Laser Deposition of Nanostructured MoS3/np-Mo//WO3−y Hybrid Catalyst for Enhanced (Photo) Electrochemical Hydrogen Evolution." Nanomaterials 9, no. 10 (2019): 1395. http://dx.doi.org/10.3390/nano9101395.

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Pulsed laser ablation of MoS2 and WO3 targets at appropriate pressures of background gas (Ar, air) were used for the preparation of new hybrid nanostructured catalytic films for hydrogen production in an acid solution. The films consisted of a nanostructured WO3−y underlayer that was covered with composite MoS3/np-Mo nanocatalyst. The use of dry air with pressures of 40 and 80 Pa allowed the formation of porous WO3−y films with cauliflower- and web-like morphology, respectively. The ablation of the MoS2 target in Ar gas at a pressure of 16 Pa resulted in the formation of amorphous MoS3 films a

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33

Paolucci, Valentina, Seyed Mahmoud Emamjomeh, Michele Nardone, Luca Ottaviano, and Carlo Cantalini. "Two-Step Exfoliation of WS2 for NO2, H2 and Humidity Sensing Applications." Nanomaterials 9, no. 10 (2019): 1363. http://dx.doi.org/10.3390/nano9101363.

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WS2 exfoliated by a combined ball milling and sonication technique to produce few-layer WS2 is characterized and assembled as chemo-resistive NO2, H2 and humidity sensors. Microstructural analyses reveal flakes with average dimensions of 110 nm, “aspect ratio” of lateral dimension to the thickness of 27. Due to spontaneous oxidation of exfoliated WS2 to amorphous WO3, films have been pre-annealed at 180 °C to stabilize WO3 content at ≈58%, as determined by X-ray Photoelectron Spectroscopy (XPS), Raman and grazing incidence X-ray Diffraction (XRD) techniques. Microstructural analysis repeated a

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Lugovskaya, L. A., L. A. Aleshina, G. M. Kalibaeva, and A. D. Fofanov. "X-ray study and structure simulation of amorphous tungsten oxide." Acta Crystallographica Section B Structural Science 58, no. 4 (2002): 576–86. http://dx.doi.org/10.1107/s0108768102006833.

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In this work, X-ray studies of the amorphous oxide films obtained by thermal evaporation of WO3 powder in a vacuum and by anodic oxidation were carried out. X-ray diffraction patterns were obtained in the symmetric reflection geometry on a DRON-4 diffractometer (Mo K α radiation, LiF monochromator) in automatic mode. Molecular dynamics simulation of amorphous tungsten oxide atomic configurations has been carried out in the micro-canonical ensemble (NVE) for N = 208 atoms and N = 624 atoms, in a cubic cell, using pairwise Born–Mayer interaction potentials and periodic boundary conditions. One o

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Alamri, Saleh N., and Ahamed A. Joraid. "Smart Windows with Different Thicknesses of V₂O₅ as Ion Storage Layers." Materials Science Forum 663-665 (November 2010): 743–50. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.743.

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Smart windows were fabricated with different thicknesses of amorphous V2O5, which acts as an ion storage layer. In these devices, V2O5 was deposited by thermal evaporation at a substrate temperature of 200 oC, and an electrochromic layer (WO3) was deposited by electron beam evaporation at a substrate temperature of 250 oC. Both layers were amorphous. V2O5 was found to exhibit direct-forbidden electron transitions, whereas the WO3 layer exhibited indirect-allowed electron transitions. An increase in the thickness of V2O5 from 78 nm to 313 nm reduced the colouration efficiency from 64 to 48 cm2/

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Kgoetlana, Charlie M., Soraya P. Malinga, and Langelihle N. Dlamini. "Photocatalytic Degradation of Chlorpyrifos with Mn-WO3/SnS2 Heterostructure." Catalysts 10, no. 6 (2020): 699. http://dx.doi.org/10.3390/catal10060699.

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Tungsten trioxide (WO3) is a photocatalyst that has gained interest amongst researchers because of its non-toxicity, narrow band gap and superior charge transport. Due to its fast charge recombination, modification is vital to counteract this limitation. In this paper, we report on the fabrication of Mn-doped WO3/SnS2 nanoparticles, which were synthesised with the aim of minimising the recombination rates of the photogenerated species. The nanomaterials were characterised using spectroscopic techniques (UV-Vis-diffuse reflectance spectroscopy (DRS), Raman, XRD, photoluminescence (PL) and elect

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Kim, Chang Yeoul, Seong Geun Cho, Seok Park, Tae Yeoung Lim, and Duck Kyun Choi. "Electrochemical and Optical Properties of WO₃ Prepared by Sol-Gel Coating." Materials Science Forum 544-545 (May 2007): 1081–84. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.1081.

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Electrochromic WO3 thin film was prepared by using tungsten metal solution in hydrogen peroxide as a starting solution and by a sol-gel dip coating method. The thermal analysis was conducted by DSC/TG method. A DSC/TG analysis and the XRD patterns showed that a tungsten oxide crystal phase was formed at 400oC. WO3 thin film when heat-treated at 300oC was amorphous and had a better electrochemical property than that of the crystalline phase. Crystallization of tungsten oxide decreased active sites of ion intercalation so that the current density decreased with heat-treatment temperature.

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Abduvalov, Alshyn, Marat Kaikanov, Timur Sh Atabaev, and Alexander Tikhonov. "Improving Photoelectrochemical Activity of Magnetron-Sputtered Double-Layer Tungsten Trioxide Photoanodes by Irradiation with Intense Pulsed Ion Beams." Nanomaterials 12, no. 15 (2022): 2639. http://dx.doi.org/10.3390/nano12152639.

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The photoelectrochemical (PEC) activity of metal oxide photoelectrodes for water-splitting applications can be boosted in several different ways. In this study, we showed that PEC activity can be significantly improved with a double-layer (crystalline-amorphous) configuration of WO3 thin films irradiated with intense pulsed ion beams (IPIB) of a nanosecond duration. It was found that IPIB irradiation promotes the formation of crystalline and sponge-like WO3 structures on the surface. Due to an increase in the active surface and light scattering in irradiated samples, photocurrent generation in

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Wei, Y. X., J. Y. Li, W. M. Liu, and Y. Yan. "Long-life Inorganic Electrochromic Device Based on WO₃ and PB Films with Fast Switching Respond." Journal of Physics: Conference Series 2639, no. 1 (2023): 012028. http://dx.doi.org/10.1088/1742-6596/2639/1/012028.

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Abstract Complementary electrochromic devices were fabricated by using tungsten trioxide (WO3) film as working electrode, Prussian blue (PB) film as counter electrode and 0.1 M lithium perchlorate in propylene carbonate as electrolyte. The XRD result presents that WO3 and PB films are amorphous, which is favourable for a fast ion intercalation-deintercalation process. The device was tested under potentiostatic control using ±1.3 V steps, and changed its color between blue and colorless. It has a fast-switching respond (about 1.5 s for colouring and 2 s for bleaching) and could withstand 100,00

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Kavitha, V. S., V. Biju, K. G. Gopchandran, et al. "Tailoring the Emission Behavior of WO3 Thin Films by Eu3+Ions for Light-Emitting Applications." Nanomaterials 13, no. 1 (2022): 7. http://dx.doi.org/10.3390/nano13010007.

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The article reports the successful fabrication of Eu3+-doped WO3 thin films via the radio-frequency magnetron sputtering (RFMS) technique. To our knowledge, this is the first study showing the tunable visible emission (blue to bluish red) from a WO3:Eu3+ thin film system using RFMS. X-ray diffractograms revealed that the crystalline nature of these thin films increased upto 3 wt% of the Eu3+ concentration. The diffraction peaks in the crystalline films are matched well with the monoclinic crystalline phase of WO3, but for all the films’, micro-Raman spectra detected bands related to WO3 monocl

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Koshida, Nobuyoshi, and Osamu Tomita. "Mechanism of a High-Contrast Inorganic Ion Resist Using Amorphous WO3." Japanese Journal of Applied Physics 25, Part 1, No. 12 (1986): 1932–35. http://dx.doi.org/10.1143/jjap.25.1932.

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Di Quarto, F., V. O. Aimiuwu, S. Piazza, and C. Sunseri. "Amorphous semiconductor—electrolyte junction. Energetics at the a-WO3—electrolyte junction." Electrochimica Acta 36, no. 11-12 (1991): 1817–22. http://dx.doi.org/10.1016/0013-4686(91)85050-h.

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Basato, M., E. Brescacin, and E. Tondello. "Amorphous WO3 Films via “Wet” CVD of a WVI Oxoalkoxide Precursor." Chemical Vapor Deposition 7, no. 5 (2001): 219. http://dx.doi.org/10.1002/1521-3862(200109)7:5<219::aid-cvde219>3.0.co;2-q.

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Lee, Min, Sun-I. Kim, Myeung-jin Lee, et al. "Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia." Nanomaterials 11, no. 6 (2021): 1452. http://dx.doi.org/10.3390/nano11061452.

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In this study, we synthesized V2O5-WO3/TiO2 catalysts with different crystallinities via one-sided and isotropic heating methods. We then investigated the effects of the catalysts’ crystallinity on their acidity, surface species, and catalytic performance through various analysis techniques and a fixed-bed reactor experiment. The isotropic heating method produced crystalline V2O5 and WO3, increasing the availability of both Brønsted and Lewis acid sites, while the one-sided method produced amorphous V2O5 and WO3. The crystalline structure of the two species significantly enhanced NO2 formation

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Fominski, Vyacheslav, Roman Romanov, Dmitry Fominski, et al. "Performance and Mechanism of Photoelectrocatalytic Activity of MoSx/WO3 Heterostructures Obtained by Reactive Pulsed Laser Deposition for Water Splitting." Nanomaterials 10, no. 5 (2020): 871. http://dx.doi.org/10.3390/nano10050871.

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This work studies the factors that affect the efficiency of the photoelectrochemical hydrogen evolution reaction (HER) using MoSx/WO3 nano-heterostructures obtained by reactive pulsed laser deposition (RPLD) on glass substrates covered with fluorinated tin oxide (FTO). Another focus of the research is the potential of MoSx nanofilms as a precursor for MoOz(S) nanofilms, which enhance the efficiency of the photo-activated oxygen evolution reaction (OER) using the MoOz(S)/WO3/FTO heterostructures. The nanocrystalline WO3 film was created by laser ablation of a W target in dry air at a substrate

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Georgijevic, Radovan, and Slavko Mentus. "The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres." Chemical Industry 65, no. 3 (2011): 279–86. http://dx.doi.org/10.2298/hemind101228009g.

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The structure and the thermal behavior of WO3 samples in air and in reduction atmosphere were studied. The sample I was prepared by the dissolution of fine metallic tungsten powder in hydrogen peroxide followed by solvent evaporation in the air at 60?C. Sample II was obtained by draining a part of the sample I at 60?C and then heating it up to 430?C. By the means of X-ray diffractometry, scanning electron microscopy and thermal analysis it was evidenced that the sample I was the amorphous hydrated gel, with the WO3?1.5H2O composition, while the second one was the anhidrous monoclinic WO3 with

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Papagiannis, Ioannis, Elias Doukas, Alexandros Kalarakis, George Avgouropoulos, and Panagiotis Lianos. "Photoelectrocatalytic H2 and H2O2 Production Using Visible-Light-Absorbing Photoanodes." Catalysts 9, no. 3 (2019): 243. http://dx.doi.org/10.3390/catal9030243.

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Hydrogen and hydrogen peroxide have been photoelectrocatalytically produced by electrocatalytic reduction using simple carbon electrodes made by depositing a mesoporous carbon film on carbon cloth. Visible-light-absorbing photoanodes have been constructed by depositing mesoporous CdS/TiO2 or WO3 films on transparent fluorine-doped tin oxide (FTO) electrodes. Both produced substantial photocurrents of up to 50 mA in the case of CdS/TiO2 and 25 mA in the case of WO3 photoanodes, and resulting in the production of substantial quantities of H2 gas or aqueous H2O2. Maximum hydrogen production rate

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Srichaiyaperk, Thanat, Kamon Aiempanakit, Mati Horprathum, et al. "Effects of Annealing Treatment on WO₃ Thin Films Prepared by DC Reactive Magnetron Sputtering." Advanced Materials Research 979 (June 2014): 248–50. http://dx.doi.org/10.4028/www.scientific.net/amr.979.248.

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Tungsten trioxide (WO3) thin films were prepared by a DC reactive magnetron sputtering technique. The thin film fabrication process used tungsten (99.995%) as the sputtering target, the mixture of argon and oxygen as sputtering and reactive gases, and silicon (100) and glass slides as the substrates. The effects of annealing temperature in the range of 200-400°C on physical and optical properties of the WO3 thin films were investigated. The nanostructures and morphologies of these films were characterized by grazing-incident X-ray diffraction (GIXRD) and field-emission scanning electron micros

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Sarkar, Arpita, Susmita Pramanik, Amitava Achariya, and Panchanan Pramanik. "A novel sol–gel synthesis of mesoporous ZrO2–MoO3/WO3 mixed oxides." Microporous and Mesoporous Materials 115, no. 3 (2008): 426–31. http://dx.doi.org/10.1016/j.micromeso.2008.02.015.

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Li, Ruixin, Faqi Zhan, Guochang Wen, et al. "Facile Synthesis of a Micro–Nano-Structured FeOOH/BiVO4/WO3 Photoanode with Enhanced Photoelectrochemical Performance." Catalysts 14, no. 11 (2024): 828. http://dx.doi.org/10.3390/catal14110828.

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In the realm of photoelectrocatalytic (PEC) water splitting, the BiVO4/WO3 photoanode exhibits high electron–hole pair separation and transport capacity, rendering it a promising avenue for development. However, the charge transport and reaction kinetics at the heterojunction interface are suboptimal. This study uses the hydrothermal–electrodeposition–dip coating–calcination method to prepare a microcrystalline WO3 photoanode thin film as the substrate material and combines it with nanocrystalline BiVO4 to form a micro–nano-structured heterojunction photoanode to enhance the intrinsic and surf

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