Nanoscale contact resistance of V<sub>2</sub>O<sub>5</sub>xerogel films developed by nanostructured powder

Bera, Biswajit; Das, Priyanka; Bhattacharya, Manjima; Ghosh, Sourja; Mukhopadhyay, Anoop Kumar; Dey, Arjun

doi:10.1088/0022-3727/49/8/085303

Cited by 12 publications

(6 citation statements)

References 64 publications

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“…Owing to its saturated oxidation state (V +5 ), Vanadium pentoxide (V 2 O 5 ) is the main stable compound in these oxidation groups [7]. Owing to its structure, V 2 O 5 has been incorporated into many applications, including solar cells, optical, and electrical devices [8,9]. α-V 2 O 5 (Orthorhombic), β-V 2 O 5 (tetragonal or monoclinic), and γ-V 2 O 5 (Orthorhombic) are some of the polymorphs of V 2 O 5 [10].…”

Section: Graphical Abstract 1 Backgroundmentioning

confidence: 99%

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Ashery

Elnouby

El-Maghraby

et al. 2023

Beni-Suef Univ J Basic Appl Sci

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Background Recently, transition-metal oxides have represented an exciting research topic, especially their fundamental and technological aspects. Here, vanadium pentoxide nanoparticles (V2O5-NPs) were synthesized through the thermal decomposition of ammonium meta-vanadate. In the current study, we investigated the photocatalytic activity of V2O5-NPs to develop and regulate the V2O5 structure for adsorption applications. Results The obtained nanoparticles were inspected by X-ray diffraction, scanning electron microscope, transmission electron microscope, and differential thermogravimetric analysis, which proved the formation of the nanorod structure. The ultraviolet–visible absorption spectra revealed a 2.26 eV band gap for V2O5-NPs that correlates with indirect optical transitions. The photocatalytic activity of the V2O5-NPs was investigated by methylene blue (MB) degradation in aqueous solutions. An initial concentration of 25 ppm, a temperature of 40 °C, 40 mg of adsorbent mass, and 1 h of contact time were the optimal conditions for the efficient removal of MB that could reach up to 92.4%. The mechanism of MB photocatalytic degradation by V2O5-NPs is explained. Conclusions The photodegradation data better fit with the Langmuir isotherm model. The thermodynamic parameters indicated that the adsorption was spontaneous and endothermic. The reaction kinetics followed the pseudo-second-order model. Thermally prepared V2O5-NPs offer a simple and efficient approach for selective MB removal from an aqueous medium. Graphical abstract

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Section: Graphical Abstract 1 Backgroundmentioning

confidence: 99%

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Ashery

Elnouby

El-Maghraby

et al. 2023

Beni-Suef Univ J Basic Appl Sci

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“…The H and E data of dip-coated vanadium oxide films [39] are reported to be 0.07 GPa and 2.31 GPa, respectively while sputtered vanadium oxide film [1] show the H and E values of~0.2 and 8.5 GPa, respectively. Thus, the data measured in the present study for the spincoated vanadium oxide thin films suggested the presence of nanomechanical properties which were distinctly higher than those reported in literature [3,39]. It is suggested that the superior nanomechanical properties of the present oxide films could be linked to the presence of high crystallinity (Fig.…”

Section: Sheet Resistance Of the Thin Filmsmentioning

confidence: 99%

Reversible, repeatable and low phase transition behaviour of spin coated nanostructured vanadium oxide thin films with superior mechanical properties

Mukherjee

Dey

Akinlabi

et al. 2018

Ceramics International

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Smooth, uniform and crystalline vanadium oxide thin films were deposited on quartz by spin coating technique with four different rpm i.e., 1000, 2000, 3000 and 4000 and subsequently post annealed at 350, 450 and 550°C in vacuum. Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) techniques were utilized for microstructural characterizations and phase analysis, respectively, for vanadium oxide powder and deposited film. Nanorods were observed to be grown after vacuum annealing. X-ray photoelectron spectroscopy (XPS) technique was utilized to study the elemental oxidation state of deposited vanadium oxide films. Thermo-optical and electrical properties such as solar transmittance (τ s ), reflectance (ρ s ), absorptance (α s ), infrared (IR) emittance (ε ir ) and sheet resistance (R s ) of different thin films were evaluated. Based on the optical characteristics the optimized condition of the film processing was identified to be spin coated at 3000 rpm. Subsequently, the nanoindentation technique was utilized to measure hardness and Young's modulus of the optimized film. The measured nanomechanical properties were found to be superior to those reported for sputtered vanadium oxide films. Finally, temperature dependent phase transition characteristics of optimized vanadium oxide films were studied by differential scanning calorimetry (DSC) technique. Reversible and repeatable phase transition was found to occur in the range of 44-48°C which was significantly lower than the phase transition temperature (i.e., 68°C) of bulk VO 2 .

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“…For clarity, only the SAED pattern in a darker area off from the direct beam spot is shown in Figure c. The SAED pattern clearly reveals that the exfoliated V 2 O 5 NRs preserve the orthorhombic α-V 2 O 5 structure of the starting bulk crystal, , which is illustrated in Figure S3 with three orthogonal lattices: a = 11.516 Å, b = 3.566 Å, and c = 4.373 Å (based on JCPDS: 41-1426). The selected V 2 O 5 NR in Figure b,c predominantly lies flat on the TEM grid with the crystal plane (001) perpendicular to the electron beam.…”

Section: Results and Discussionmentioning

confidence: 99%

“…These are consistent with the form factors of the large orthorhombic α-V 2 O 5 unit cell, as shown in the JCPDS: 41-1426 file. Clearly, the exfoliated V 2 O 5 NRs preserve the orthorhombic α-V 2 O 5 crystal structure 40,41 and are aligned in specific crystal orientations. Figure 2e,f 24,42,43 In addition, the Raman spectra of Zn-V 2 O 5 NR/rGO and (Mn + Zn)-V 2 O 5 NR/rGO show a broad peak around 870 cm −1 (marked with the arrows) that can be attributed to the presence of multiple oxidation states of vanadium due to the intercalation or surface binding of Zn 2+ and Mn 2+ cations.…”

Section: ■ Experimental Sectionmentioning

confidence: 98%

Synthesis of V₂O₅ Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation

Muthukumar

Rajendran

Sekar

et al. 2023

ACS Sustainable Chem. Eng.

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Aqueous zinc-ion batteries (AZIBs) are an emerging sustainable and safer technology for large-scale electrical energy storage. Here, we report the synthesis of hybrid materials consisting of V2O5 nanoribbons (NRs) and reduced graphene oxide (rGO) nanosheets as AZIB cathode materials by divalent metal cation-mediated coprecipitation. The divalent metal ions M2+ (Zn2+ and Mn2+) effectively neutralize the negative charges on the surface of microwave-exfoliated crystalline V2O5 NRs and graphene oxide (GO) nanosheets to form a strongly bound assembly. After thermal annealing in a nitrogen atmosphere, GO is converted into rGO with higher electrical conductivity while the layers in V2O5 NRs are expanded by M2+ intercalation. When only Zn2+ ions are used during coprecipitation, the produced Zn-V2O5 NR/rGO hybrid shows a very high reversible specific capacity of ∼395 mAh g–1 at 0.50 A g–1 but suffers from poor stability. This is improved by mixing Mn2+ with Zn2+ ions during coprecipitation. The (Mn + Zn)-V2O5 NR/rGO hybrid shows a slightly lower specific capacity of ∼291 mAh g–1 at 0.5 A g–1 but a substantially improved long-cycling stability and better rate performance due to the stronger binding of Mn atoms in the V2O5 host that serve as stable pillars to support the expanded V2O5 layers.

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Nanoscale contact resistance of V₂O₅xerogel films developed by nanostructured powder

Cited by 12 publications

References 64 publications

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Reversible, repeatable and low phase transition behaviour of spin coated nanostructured vanadium oxide thin films with superior mechanical properties

Synthesis of V₂O₅ Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation

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Nanoscale contact resistance of V2O5xerogel films developed by nanostructured powder

Cited by 12 publications

References 64 publications

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Reversible, repeatable and low phase transition behaviour of spin coated nanostructured vanadium oxide thin films with superior mechanical properties

Synthesis of V2O5 Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation

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Product

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Nanoscale contact resistance of V₂O₅xerogel films developed by nanostructured powder

Synthesis of V₂O₅ Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation