Physicochemical properties of sprayed V2O5 thin films: Effect of substrate temperature

Mane, A.A.; Ganbavle, V.V.; Gaikwad, M.A.; Nikam, S.S.; Rajpure, K.Y.; Moholkar, A.V.

doi:10.1016/j.jaap.2015.06.017

Cited by 50 publications

(13 citation statements)

References 32 publications

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“…18 Tauc plots are commonly employed to determine the optical bandgap of semiconductors by extrapolating the linear region to the abscissa. [33][34] yielded a bleach of the band-gap absorption (Fig. S1), consistent with the Burstein-Moss effect.…”

Section: Ground-state Absorption Spectra Of Unfunctionalized β-Pb 033 V 2 O 5 and V 2 O 5 Nanowiressupporting

confidence: 75%

“…Tauc plots are commonly employed to determine the optical bandgap of semiconductors by extrapolating the linear region to the abscissa. , Tauc plots of (energy × log(1/ R )) 2 versus energy, where R is reflectance, for V 2 O 5 and β-Pb 0.33 V 2 O 5 (Figure B) accentuate the midgap excitation features. Both plots contain a linear region, associated with bandgap excitation, and a pronounced deviation from linearity at lower energies due to intrinsic localized absorptions derived from midgap states.…”

Section: Resultsmentioning

confidence: 99%

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Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

et al. 2016

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For solar energy conversion, not only must a semiconductor absorb incident solar radiation efficiently but also its photoexcited electron-hole pairs must further be separated and transported across interfaces. Charge transfer across interfaces requires consideration of both thermodynamic driving forces as well as the competing kinetics of multiple possible transfer, cooling, and recombination pathways. In this work, we demonstrate a novel strategy for extracting holes from photoexcited CdSe quantum dots (QDs) based on interfacing with β-Pb 0.33 V 2 O 5 nanowires that have strategically positioned mid-gap states derived from the intercalating Pb 2+ -ions. Unlike mid-gap states derived from defects or dopants, the states utilized here are derived from the intrinsic crystal structure and are thus homogeneously distributed across the material. CdSe/β-Pb 0.33 V 2 O 5 heterostructures were assembled using two distinct methods: successive ionic layer adsorption and reaction (SILAR) and linker-assisted assembly (LAA). Transient absorption spectroscopy measurements indicate that electrons and holes can be transferred from the photoexcited CdSe QDs to the conduction and mid-gap states, respectively, of β-Pb 0.33 V 2 O 5 nanowires for both types of heterostructures. Holes were transferred on time scales less than 1 ps, whereas electrons were transferred more slowly on time scales of approximately 2 ps. In contrast, for analogous heterostructures consisting of CdSe QDs interfaced with V 2 O 5 nanowires (wherein mid-gap states are absent), only electron transfer was observed. Interestingly, electron transfer was readily achieved for CdSe QDs interfaced with V 2 O 5 nanowires by the SILAR method; however, for interfaces incorporating molecular linkers, electron transfer was observed only upon excitation at energies substantially greater than the band-gap absorption threshold of CdSe. Transient absorbance decay traces reveal longer exciton lifetimes (1-3 µs) for CdSe/β-Pb 0.33 V 2 O 5 heterostructures relative to bare β-Pb 0.33 V 2 O 5 nanowires (0.2-0.6 µs); the difference is attributed to surface passivation of intrinsic surface defects in β-Pb 0.33 V 2 O 5 upon interfacing with CdSe (290 words).

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Section: Ground-state Absorption Spectra Of Unfunctionalized β-Pb 033 V 2 O 5 and V 2 O 5 Nanowiressupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

et al. 2016

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“…2.51 500 1C, 190 respectively. E opt increases from 2.5 eV to 2.2 eV as a function of treatment temperature in the hydrothermal process.…”

Section: Influence Of the Growth Parametersmentioning

confidence: 96%

Recent advances in vanadium pentoxide (V₂O₅) towards related applications in chromogenics and beyond: fundamentals, progress, and perspectives

Pham

Dong

et al. 2022

J. Mater. Chem. C

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“…It has been reported before by some researchers that one of the materials with low band gap energy, of around 2.8 eV, and some stability in aqueous solutions is the V 2 O 5 -based photocatalysts [13], potentially active under irradiation with visible light and investigated in the last years [14][15][16][17]. The synthesis of V 2 O 5 has been reported by using techniques as the hydrothermal synthesis [18], solgel technique [19], thermal decomposition of several precursors as ammonium metavanadate (NH 4 VO 3 ) [20], flamespray pyrolysis [21,22] magnetron sputtering, electron-beam evaporation, and pulsed laser deposition [23,24], obtaining several morphologies as nanobelts [18,19], nanowires [18], nanoribbons, nanopowders [18,21], and also thin films [19,[21][22][23]. Thin films and powders have been obtained with different textural and structural properties related in some cases with their photocatalytic activity [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Ag-Modified V₂O₅Photocatalytic Materials

Solís-Casados

Escobar-Alarcón

Infantes‐Molina

et al. 2017

Journal of Chemistry

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V2O5powders modified with different theoretical silver contents (1, 5, 10, 15, and 20 wt% as Ag2O) were obtained with acicular morphologies observed by scanning electron microscopy (SEM). Shcherbinaite crystalline phase is transformed into the Ag0.33V2O5crystalline one with the incorporation and increase in silver content as was suggested by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. With further increase in silver contents the Ag2O phase appears. Catalysts were active in photocatalytic degradation of malachite green dye under simulated solar light, which is one of the most remarkable facts of this work. It was found that V2O5-20Ag was the most active catalytic formulation and its activity was attributed to the mixture of coupled semiconductors that promotes the slight decrease in the rate of the electron-hole pair recombination.

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Physicochemical properties of sprayed V2O5 thin films: Effect of substrate temperature

Cited by 50 publications

References 32 publications

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

Recent advances in vanadium pentoxide (V₂O₅) towards related applications in chromogenics and beyond: fundamentals, progress, and perspectives

Synthesis and Characterization of Ag-Modified V₂O₅Photocatalytic Materials

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Physicochemical properties of sprayed V2O5 thin films: Effect of substrate temperature

Cited by 50 publications

References 32 publications

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb0.33V2O5 Heterostructures

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb0.33V2O5 Heterostructures

Recent advances in vanadium pentoxide (V2O5) towards related applications in chromogenics and beyond: fundamentals, progress, and perspectives

Synthesis and Characterization of Ag-Modified V2O5Photocatalytic Materials

Contact Info

Product

Resources

About

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

Directional Charge Transfer Mediated by Mid-Gap States: A Transient Absorption Spectroscopy Study of CdSe Quantum Dot/β-Pb_0.33V₂O₅ Heterostructures

Recent advances in vanadium pentoxide (V₂O₅) towards related applications in chromogenics and beyond: fundamentals, progress, and perspectives

Synthesis and Characterization of Ag-Modified V₂O₅Photocatalytic Materials