Effect of ZnO layer thickness upon optoelectrical properties of NiO/ ZnO heterojunction prepared at room temperature

The incorporation of tungsten trioxide (WO3) by various concentrations of graphitic carbon nitride (g-C3N4) was successfully studied. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Diffused Reflectance UV-Vis techniques were applied to investigate morphological and microstructure analysis, diffused reflectance optical properties, and photocatalysis measurements of WO3/g-C3N4 photocatalyst composite organic compounds. The photocatalytic activity of incorporating WO3 into g-C3N4 composite organic compounds was evaluated by the photodegradation of both Methylene Blue (MB) dye and phenol under visible-light irradiation. Due to the high purity of the studied heterojunction composite series, no observed diffraction peaks appeared when incorporating WO3 into g-C3N4 composite organic compounds. The particle size of the prepared composite organic compound photocatalysts revealed no evident influence through the increase in WO3 atoms from the SEM characteristic. The direct and indirect bandgap were recorded for different mole ratios of WO3/g-C3N4, and indicated no apparent impact on bandgap energy with increasing WO3 content in the composite photocatalyst. The composite photocatalysts’ properties better understand their photocatalytic activity degradations. The pseudo-first-order reaction constants (K) can be calculated by examining the kinetic photocatalytic activity.

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“…The calculated crystallite size D depends on the broadening diffraction peak β , the diffraction angle

, and the X-ray wavelength λ. Both dislocation density

and lattice strain

were calculated using the following equations [ 23 , 24 ]:

…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Highly Efficient As-Synthesized WO3/Graphitic-C3N4 Nanocomposite for Photocatalytic Degradation of Organic Compounds

et al. 2022

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“…However, the I – V curve of the Au-ZnO sensor shows obvious nonlinearity from −4 to 4 V, indicating a good Schottky barrier between ZnO NRs and Au NPs . Furthermore, the I – V curves of Au-ZnO/WSe 2 and Au-ZnO/exfoliated WSe 2 are nonlinear with rectification behavior, demonstrating the presence of a p-n junction at the material interface. , Moreover, the heterojunction formed in the composite with exfoliated WSe 2 is more obvious because of stronger nonlinearity.…”

Section: Resultsmentioning

confidence: 97%

Room-Temperature Benzene Sensing with Au-Doped ZnO Nanorods/Exfoliated WSe₂ Nanosheets and Density Functional Theory Simulations

Zhang

Pan

Zhou

et al. 2021

ACS Appl. Mater. Interfaces

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A gold-doped zinc oxide (Au-ZnO)/exfoliated tungsten diselenide (exfoliated WSe2) nanocomposite-based gas sensor toward benzene with high sensing properties was demonstrated. Epoxy resin was used as the matrix of the Au-ZnO/exfoliated WSe2 nanocomposite sensor. The straw-shaped Au-ZnO was synthesized by the hydrothermal method, and WSe2 nanosheets (NSs) were prepared via hydrothermal and liquid-phase exfoliation methods. The properties of Au-ZnO/exfoliated WSe2 nanoheterostructures constructed by self-assembly technology have been confirmed via a series of characterization methods. The benzene-sensing performances of sensors were tested at 25 °C. Compared with Au-ZnO, WSe2, and their composites, the Au-ZnO/exfoliated WSe2 sensor has a significant performance improvement, including a higher response and linear fit degree, better selectivity and repeatability, and faster detection rate. The significantly enhanced sensing properties of the Au-ZnO/exfoliated WSe2 sensor can be ascribed to the doping of Au nanoparticles, the increase in the specific surface area and adsorption sites of NSs after exfoliation, and the cooperative interface combination of the ZnO/WSe2 heterojunction. Furthermore, the sensitivity mechanism of the composite sensor to benzene was explored by density functional theory simulations.

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“…In addition, the similar result was also found in the literatures. 6,34,35,37) Therefore, the formation of the (103) plane induced by the residual stress from Al dopant could be disregarded. Another explanation of the (103) plane formation is referred through the reformation of free-moving deposited atom taken place at the end of the preparation process.…”

Section: The Influence Of the Thickness On The Crystalline Formation ...mentioning

confidence: 99%

“…1,2) These excellent properties bring ZnO to become the promising candidate employed in optoelectronic, electrochemical, and gas sensing applications. 1,[3][4][5][6][7] Control of ZnO formation to achieve onedimensional (1D) nanostructures, e.g. nanowires (NWs) and nanorod (NRs), leads not only to significant enlargement in surface area but also to considerable enhancement of electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Influence of aluminum-doped zinc oxide seeding film on morphological properties of hydrothermally-grown zinc oxide nanorods

Khemasiri

Kayunkid

Soyeux

et al. 2020

Jpn. J. Appl. Phys.

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The morphological properties, e.g. diameter, aspect ratio, and density, of zinc oxide nanorods (ZnO-NRs) can be achieved through the control of seeding film morphology in seed-assisted hydrothermal process. The different morphologies of seeding film made by aluminum-doped zinc oxide (AZO) thin films are obtained by varying the thickness of seeding film. The change of seeding morphology from small granules with (002) plane dominant to platelets with (103) plane dominant leads to the significant change in the morphological formation of ZnO-NRs successively grown on the seeding film. The seeding film containing the dominant plane of (002) and small granules offers vertical-aligned ZnO-NRs with high surface area (high density and respect ratio) attributed to high nucleating density as well as the limit of the lateral growth from the surrounding adjacent nanorods. This work provides the consideration of morphological properties of seeding film.

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Effect of ZnO layer thickness upon optoelectrical properties of NiO/ ZnO heterojunction prepared at room temperature

Cited by 14 publications

References 39 publications

Fabrication and Characterization of Highly Efficient As-Synthesized WO3/Graphitic-C3N4 Nanocomposite for Photocatalytic Degradation of Organic Compounds

Fabrication and Characterization of Highly Efficient As-Synthesized WO3/Graphitic-C3N4 Nanocomposite for Photocatalytic Degradation of Organic Compounds

Room-Temperature Benzene Sensing with Au-Doped ZnO Nanorods/Exfoliated WSe₂ Nanosheets and Density Functional Theory Simulations

Influence of aluminum-doped zinc oxide seeding film on morphological properties of hydrothermally-grown zinc oxide nanorods

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Effect of ZnO layer thickness upon optoelectrical properties of NiO/ ZnO heterojunction prepared at room temperature

Cited by 14 publications

References 39 publications

Fabrication and Characterization of Highly Efficient As-Synthesized WO3/Graphitic-C3N4 Nanocomposite for Photocatalytic Degradation of Organic Compounds

Fabrication and Characterization of Highly Efficient As-Synthesized WO3/Graphitic-C3N4 Nanocomposite for Photocatalytic Degradation of Organic Compounds

Room-Temperature Benzene Sensing with Au-Doped ZnO Nanorods/Exfoliated WSe2 Nanosheets and Density Functional Theory Simulations

Influence of aluminum-doped zinc oxide seeding film on morphological properties of hydrothermally-grown zinc oxide nanorods

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Room-Temperature Benzene Sensing with Au-Doped ZnO Nanorods/Exfoliated WSe₂ Nanosheets and Density Functional Theory Simulations