Preparation and Surface Characterization of Nanostructured MoO3/CoxOy and V2O5/CoxOy Interfacial Layers as Transparent Oxide Structures for Photoabsorption

Adewinbi, Saheed A.; Taleatu, Bidini A.; Busari, Rafiu A.; Adewumi, Olusegun E.; Omotoso, Ezekiel; Oyedotun, Kabir O.; Manyala, Ncholu I.

doi:10.1007/s11664-020-08096-9

Cited by 16 publications

(9 citation statements)

References 24 publications

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“…The result of the simulations gave the stoichiometric ratio of elements, compositions of layers and the film thickness of each sample. The RBS spectra are shown in figures (3) and the analysis presented in the table (1). Some important features could be inferred from the RBS analysis.…”

Section: Compositional Studymentioning

confidence: 96%

“…However, beyond the lower limit value of bandgap, the structural characteristics of a material such as lattice distortions or disorder are capable of producing extended localized states in the energy gap of such materials leading to sub-bandgap absorption edge commonly called Urbach energy, E u . In this lower photon energy range, the spectral dependence of the absorption edge follows the empirical Urbach rule given by equation (3) [1,33] where α o and E c are material constants, E is the photon energy and E u denotes the width of the tail of localized states in the bandgap (Urbach energy)…”

Section: Urbach Energymentioning

confidence: 99%

“…One of the attendant drawbacks of decades of global reliance on fossil energy sources is the environmental pollutions caused exploration processes and release of toxic wastes into the environment. Prominent among the various techniques that have been used in solving this problem is the use of metal oxides semiconductor heterostructures in photoabsorption and photocatalytic degradation of many pollutants [1][2][3][4][5][6][7] and detection of harmful gases [8][9][10][11]. Metal oxides heterostructures offer several advantages such as easy band engineering, improved charge carrier transport, increased electromagnetic photon absorption and overall better efficiencies over single oxides [1,[4][5][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

Animasahun

Taleatu

Adewinbi

et al. 2021

J. Nig. Soc. Phys. Sci.

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Many metal oxide heterostructures have been synthesized as mixed oxides or layered structures for photocatalytic, photodegradation of pollutants and light-harvesting applications. However, in the layered structures the effects of interfacial properties and composition have largely not been explored. Hence, the effects of interfacial mixing and diffusion of sandwiched thin CuO layer on optical absorption of as-deposited and heat-treated multi-layered structured SnO2/CuO/SnO2 films were studied. The RBS analysis of the as-deposited films showed the presence of a minute amount of Cu in the surface and bottom SnO2 layers of the structure. We attributed this to inhomogeneous layer thickness evidenced by very low Sn/Cu atoms ratio of the CuO layer. However, the thermal treatment of the layered structure led to pronounced interlayer mixing and consequent formation of SnO2-CuO solid solutions throughout the layered structure. The layer integrity of the inserted CuO of the as-deposited films was very high and the as-deposited structure was far more optically absorbing. However, the annealed structure showed lesser optical absorption because of the onset of interfacial mixing and improved crystallization. This reflected in the optical bandgap variations of the as-deposited and annealed multilayered structures. The significance of this result is that the multi-layered films possess band narrowing – evidence of increased photon absorption - making it a better candidate than pure SnO2 oxide for photocatalysis, photodegradation and photodetection applications. It also pointed to the fact that attention must be paid to effects of heat treatments or annealing when inserting an absorbing layer into a photocatalyst or a material meant for photodegradation or any light-harvesting material.

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Section: Compositional Studymentioning

confidence: 96%

Section: Urbach Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

Animasahun

Taleatu

Adewinbi

et al. 2021

J. Nig. Soc. Phys. Sci.

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“…The Williamson-Hall curves of the Ag 2 S and In 2 S 3 are obtained by plotting βcosθ versus 4sinθ (figure S1). The slopes of the fitted straight lines by the plots demonstrates the intrinsic strain values of the deposited structures accordingly [38]. The intrinsic strains of Ag 2 S and In 2 S 3 calculated from the slope are −0.004 93 and −0.004 63, respectively, and the slope is negative, indicating the occurrence of lattice contraction [39].…”

Section: Crystal Structure and Microstructure Informationmentioning

confidence: 97%

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Li¹,

Yang²,

Cui³

et al. 2022

Nanotechnology

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A novel In2S3/Ag2S/TiO2 nanotube arrays (NTAs) was successfully fabricated by successive ionic layer adsorption and reaction (SILAR) method and electrochemical anodic oxidation method, and served as photoanode for photocathodic protection application. The micromorphologies, optical absorption properties, crystalline structure and elemental valence states of the composites were performed by field emission scanning electron microscopy, high resolution transmission electron microscope, UV−vis diffuse reflectance absorption spectra, X-ray diffractometer and X-ray photoelectron spectroscopy, respectively. The photocathodic protection performances of In2S3/Ag2S/TiO2 NTAs on the Q235 carbon steel (CS) were also studied. The In2S3/Ag2S/TiO2 nanocomposites show better photoelectrocatalytic and photocathodic protection performance than pure TiO2 NTAs. The photocurrent density of In2S3(9)/Ag2S(8)/TiO2 photoelectrode coupled with Q235 CS reach 211 μA cm−2, which is about 4.5 times higher than that of TiO2 NTAs. The photogenerated potential of Q235 CS coupled to In2S3(9)/Ag2S(8)/TiO2 under illumination shows a negative shift to −0.92 V vs. SCE. Results indicate that the co-sensitization of In2S3 and Ag2S could extend the light absorption of TiO2 to the visible light range and enhance its photoelectric conversion efficiency.microscope, UV−vis diffuse reflectance absorption spectra, X-ray diffractometer and X-ray photoelectron spectroscopy, respectively. The photocathodic protection performances of In2S3/Ag2S/TiO2 NTAs on the Q235 carbon steel (CS) were also studied. The In2S3/Ag2S/TiO2 nanocomposites show better photoelectrocatalytic and photocathodic protection performance than pure TiO2 NTAs. The photocurrent density of In2S3(9)/Ag2S(8)/TiO2 photoelectrode coupled with Q235 CS reach 211 μA cm−2, which is about 4.5 times higher than that of TiO2 NTAs. The photogenerated potential of Q235 CS coupled to In2S3(9)/Ag2S(8)/TiO2 under illumination shows a negative shift to −0.92 V vs. SCE. Results indicate that the co-sensitization of In2S3 and Ag2S could extend the light absorption of TiO2 to the visible light range and enhance its photoelectric conversion efficiency.

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“…To our knowledge, this study is being reported for the first time. Some surface properties of these structures have been investigated in one of our previous studies and the results showed that they are suitable and scalable materials for device fabrication [12].…”

Section: Introductionmentioning

confidence: 99%

Characterization of two-way fabricated hybrid metal-oxide nanostructured electrode materials for photovoltaic and miniaturized supercapacitor applications

Adewinbi

Taleatu

Maphiri

et al. 2021

Solid State Sciences

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Preparation and Surface Characterization of Nanostructured MoO3/CoxOy and V2O5/CoxOy Interfacial Layers as Transparent Oxide Structures for Photoabsorption

Cited by 16 publications

References 24 publications

Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Characterization of two-way fabricated hybrid metal-oxide nanostructured electrode materials for photovoltaic and miniaturized supercapacitor applications

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Preparation and Surface Characterization of Nanostructured MoO3/CoxOy and V2O5/CoxOy Interfacial Layers as Transparent Oxide Structures for Photoabsorption

Cited by 16 publications

References 24 publications

Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

Synthesis of SnO2/CuO/SnO2 Multi-layered Structure for Photoabsorption: Compositional and Some Interfacial Structural Studies

A highly efficient In2S3/Ag2S/TiO2 NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Characterization of two-way fabricated hybrid metal-oxide nanostructured electrode materials for photovoltaic and miniaturized supercapacitor applications

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A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light