Influence of hydrogen annealing on the optoelectronic properties of WO3 thin films

Saleem, Muhammad Rizwan; Al-Kuhaili, M.F.; Durrani, S.M.A.; Hendi, Awatif A.; Bakhtiari, I.A.; Ali, Shahid

doi:10.1016/j.ijhydene.2015.06.078

Cited by 60 publications

(39 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak observed at 529.89 eV corresponds to the lattice oxygen O 2 − bonded to W [ 22 ]. The medium binding energy component, centered at 531.24 eV, is described as O − or reduced W x + -state connected O 2 − species [ 23 ]. Moreover, the peak observed at 532.83 eV is related to the OH − group, which comes from the adsorbed H 2 O. Saleem [ 23 ] found that the broadening of the O1s spectra and the appearance of a shoulder at higher binding energy values evidently indicated the presence of multiple components.…”

Section: Resultsmentioning

confidence: 99%

“…The medium binding energy component, centered at 531.24 eV, is described as O − or reduced W x + -state connected O 2 − species [ 23 ]. Moreover, the peak observed at 532.83 eV is related to the OH − group, which comes from the adsorbed H 2 O. Saleem [ 23 ] found that the broadening of the O1s spectra and the appearance of a shoulder at higher binding energy values evidently indicated the presence of multiple components. Combined with the analyses of XRD, SEM and XPS, the WO 3 ∙0.33H 2 O/W 18 O 49 can be obtained when the reaction time arrives at 12 h. Considering all the above measurements and corresponding results, the reaction time has an important influence on the phase transition and the microstructure of the samples.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

et al. 2016

View full text Add to dashboard Cite

Hierarchical tungsten oxide assemblies such as spindle-like structures, flowers with sharp petals, nanowires and regular hexagonal structures are successfully synthesized via a solvothermal reduction method by simply adjusting the reaction conditions. On the basis of the experimental results, it is determined that the reaction time significantly influences the phase transition, microstructure and photocatalytic activity of the prepared samples. The possible mechanisms for the morphology evolution process have been systematically proposed. Moreover, the as-prepared products exhibit significant morphology-dependent photocatalytic activity. The flower-like W18O49 prepared at 6 h possesses a large specific surface area (150.1 m2∙g−1), improved separation efficiency of electron-hole pairs and decreased electron-transfer resistance according to the photoelectrochemical measurements. As a result, the flower-like W18O49 prepared at 6 h exhibits the highest photocatalytic activity for the degradation of Methyl orange aqueous solution. The radical trap experiments showed that the degradation of MO was driven mainly by the participation of h+ and •O2− radicals.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

et al. 2016

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 97%

“…Moreover, the peak observed at 532.83 eV is related to the OH − group, which comes from the adsorbed H2O. Saleem [23] found that the broadening of the O1s spectra and the appearance of a shoulder at higher binding energy values evidently indicated the presence of multiple components. Combined with the analyses of XRD, SEM and XPS, the WO3•0.33H2O/W18O49 can be obtained when the reaction time arrives at 12 h. Considering all the above measurements and corresponding results, the reaction time has an important influence on the phase transition and the microstructure of the samples.…”

Section: Resultsmentioning

confidence: 99%

Shape Evolution of Hierarchical W<sub>18</sub>O<sub>49</sub> Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

Hai

Huang

Cao

et al. 2016

Preprint

View full text Add to dashboard Cite

Abstract:Hierarchical tungsten oxide assemblies such as spindle-like structures, flowers with sharp petals, nanowires and regular hexagonal structures are successfully synthesized via a solvothermal reduction method by simply adjusting the reaction conditions. On the basis of the experimental results, it is determined that the reaction time significantly influences the phase transition, microstructure and photocatalytic activity of the prepared samples. The possible mechanisms for the morphology evolution process have been systematically proposed. Moreover, the as-prepared products exhibit significant morphology-dependent photocatalytic activity. The flower-like W18O49 prepared at 6 h possesses a large specific surface area (150.1 m 2 •g −1 ), improved separation efficiency of electron-hole pairs and decreased electron-transfer resistance according to the photoelectrochemical measurements. As a result, the flower-like W18O49 prepared at 6 h exhibits the highest photocatalytic activity for the degradation of Methyl orange aqueous solution. The radical trap experiments showed that the degradation of MO was driven mainly by the participation of h + and •O 2− radicals.

show abstract

“…One may therefore deduce that within the CdS/WO x sample, O 1 s contributions from the CdS surface accounted for roughly one-sixteenth of the total, and hence it is reasonable to neglect them during deconvolution of the O 1 s spectrum. The O 1 s component centred at 530.6 eV may be attributed to O atoms within the WO x lattice, while the component at 531.9 eV corresponds to O atoms at the surface of the WO x lattice and the highest energy contribution, at 533.1 eV, is again typically associated with surface species such as adsorbed water 90–96 . The small component centred at 528.5 eV cannot be reconciled with WO x , but it is consistent with CdO 66,83–86 ; no such component was observed in the O 1 s signal of CdS, suggesting that Cd(OH) 2 or other Cd-containing compounds at the CdS surface were converted to CdO during formation of the composite.…”

Section: Resultsmentioning

confidence: 99%

Photocapacitive CdS/WOx nanostructures for solar energy storage

Jones

Phillips

Gannon

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Through a facile solvothermal procedure, a CdS/WO x nanocomposite has been synthesised which exhibits photocapacitive behaviour under white light illumination at a radiant flux density of 99.3 mW cm −2 . Photoelectrochemical experiments were undertaken to examine the self-charging properties of the material and to develop an understanding of the underlying electronic band structure responsible for the phenomenon. By employing XPS, UPS and UV-Vis diffuse reflectance spectroscopy for further characterisation, the ability of the composite to generate current following the removal of incident light was related to the trapping of photoexcited electrons by the WO x component. The presence of WO x yielded an order of magnitude increase in the transient photocurrent response relative to CdS alone, an effect attributed to the suppression of electron-hole recombination in CdS due to hole transfer across the CdS/WO x interface. Moreover, current discharge from the material persisted for more than twenty minutes after final illumination, an order of magnitude improvement over many existing binary composites. As a seminal investigation into the photocapacitive characteristics of CdS/WO x composites, the work offers insight into how the constituent materials might be utilised as part of a future self-charging solar device.

show abstract

Influence of hydrogen annealing on the optoelectronic properties of WO3 thin films

Cited by 60 publications

References 61 publications

Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

Shape Evolution of Hierarchical W<sub>18</sub>O<sub>49</sub> Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

Photocapacitive CdS/WOx nanostructures for solar energy storage

Contact Info

Product

Resources

About