Phase transition and changing properties of nanostructured V2O5 thin films deposited by spray pyrolysis technique, as a function of tungsten dopant

Baltakesmez, Ali; Aykaç, Cengiz; Güzeldir, B.

doi:10.1007/s00339-019-2736-0

Cited by 32 publications

(8 citation statements)

References 55 publications

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“…Additional consequences, such as modification of stability, size or morphology, shift of the band gap energy, and increased conductivity have also been observed. [186][187][188] Electronic Consequences of Cationic Dopants in POVs. The redox properties of polyoxometalates have been well established to be dependent on the molecular composition and structure of the polynuclear assembly.…”

Section: Distribution M-o C (å)mentioning

confidence: 99%

Atomically precise vanadium-oxide clusters

et al. 2021

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Section: Distribution M-o C (å)mentioning

confidence: 99%

Atomically precise vanadium-oxide clusters

et al. 2021

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“…6) of the samples at room temperature for an excitation wavelength of 460 nm. In the present study, the pure V 2 O 5 nanoparticles exhibited a broad green emission peak (535-570 nm), which corresponds to the recombination of photo-excited electrons at the bottom of the conduction band (V-3d) with holes in the top of the valance band (O-2p) (Baltakesmez, et al 2019, Le, et al 2019). The intensity of green PL emission is comparatively lower in pure V 3 O 7 nanoparticles than in V 2 O 5 due to a reduction in the recombination of charge carriers.…”

Section: Photoluminescence Studiesmentioning

confidence: 54%

Enhanced photocatalytic activity of V3O7 / V2O5 – reduced graphene oxide nanocomposite towards methylene blue dye degradation

Aruchamy,

Sudarsan,

Ajith

et al. 2024

Environ Sci Pollut Res

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This work investigates the photocatalytic performance of V 2 O 5 and V 3 O 7 nanoparticles and their nanocomposites with rGO. The as-annealed V 2 O 5 and V 3 O 7 nanoparticles exhibited pure orthorhombic and monoclinic structures with an optical bandgap of 2.3 and 2.5 eV, respectively. The corresponding vibrational modes using Raman and FTIR spectroscopy analysis further con rm the form. The morphological studies reveal that V 2 O 5 and V 3 O 7 nanoparticles possess plate and petal-like morphology, respectively. Moreover, in the case of V 2 O 5 /V 3 O 7 -rGO nanocomposites, the plate/petal-like nanoparticles are embedded within rGO sheets. Incorporating nanoparticles within rGO sheets has quenched the green photoluminescence emission, enhancing their photocatalytic performance upon irradiation with white light of 100 mW/cm 2 . This is ascribed to the effective transport of interfacial electrons from vanadium oxide nanoparticles to the rGO surface, reducing the recombination of photogenerated charge carriers. These results indicate that the vanadium oxide/rGO nanocomposites have potential applications in wastewater treatment.

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“…The major vibrational region in the Raman spectra of vanadium oxide systems is situated in the 100–1200 cm −1 range and covers: V−0 terminal stretching that occurs at 770–1050 cm −1 , the V−0−V stretching region at 500–800 cm −1 and the bending mode at 150–400 cm −1 . Lattice vibrations of crystalline compounds may also be present below 150 cm −1 [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Light-Sensing Properties of Amorphous Vanadium Oxide Films Prepared by RF Sputtering

Plugaru

Mihalache

Romanițan

et al. 2023

Sensors

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In this study we analyzed the structure and light-sensing properties of as-deposited vanadium oxide thin films, prepared by RF sputtering in different Ar:O2 flow rate conditions, at low temperature (e.g., 65 °C). X-ray diffraction (XRD), Scanning Electron Microscopy (SEM-EDX), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were employed to analyze the film microstructure, composition and the oxidation states of vanadium ions. The SEM micrographs evidence VxOy films with smooth surfaces, whereas the XRD patterns show their amorphous structure. Raman spectra indicate an increased structural disorder in the films deposited in Ar:O2 flow comparatively with those deposited solely in Ar flow. The XPS data suggest the modification of the oxidation state from V4+ to V5+, thus proving the formation of the V2O5 phase when increasing the oxygen content, which further affects the films’ optical properties. We observed a good stability of the photogenerated current in Si/SiO2/VxOy/TiN heterostructures upon excitation with pulses of UV (360 nm), VIS (white light) and NIR (860 nm) light. The responsivity, detectivity and linear dynamic range parameters increase with the O/V ratio in the VxOy films, reaching comparable values with photodetectors based on crystalline V2O5 or VO2.

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Phase transition and changing properties of nanostructured V2O5 thin films deposited by spray pyrolysis technique, as a function of tungsten dopant

Cited by 32 publications

References 55 publications

Atomically precise vanadium-oxide clusters

Atomically precise vanadium-oxide clusters

Enhanced photocatalytic activity of V3O7 / V2O5 – reduced graphene oxide nanocomposite towards methylene blue dye degradation

Light-Sensing Properties of Amorphous Vanadium Oxide Films Prepared by RF Sputtering

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