Structural refinement, morphology and photocatalytic properties of β-(Ag2−2xZnx)MoO4 microcrystals synthesized by the sonochemical method

Coimbra, D. W. R.; Cunha, F. S.; Sczancoski, J. C.; Carvalho, J. F.; Macedo, Francisco Rafael Campos de; Cavalcante, L. S.

doi:10.1007/s10854-018-0401-6

Cited by 12 publications

(11 citation statements)

References 93 publications

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“…On the basis of these results, the favorable substitution of silver atoms (1.16 Å) with copper atoms (0.71 Å) in the crystal lattice is suggested. 3 Parts c and d of Figure 1 show good accordance between the experimental (Y obs ) and theoretical (Y obs ) data, in which the residual line (Y obs − Y cal ) shows a small difference for all diffraction peaks refined for all samples. Moreover, the values of the R parameters 11 suggest a good and reliable refinement.…”

Section: Methodssupporting

confidence: 62%

“…The normalized intensities are different, suggesting replacement of the Cu 2+ ions. [1][2][3]5 3.3. UV−Vis by DRS.…”

Section: Results Andmentioning

confidence: 99%

“…The Rietveld refinement method was performed using the diffraction patterns of the β-Ag 2 MoO 4 and β-Ag 1.94 Cu 0.06 MoO 4 samples as the input file. − Also, the structural information from COD 7222296 (.cif) was used as the theoretical data. This study used the Fullprof program (public domain), July 2021 version for Windows, to compute the experimental and theoretical data.…”

Section: Methodsmentioning

confidence: 99%

“…Molybdenum oxide compounds are a well-known semiconductor family that has been investigated for several applications such as catalysts, − sensors, , photocatalysts, , microbial agents, , and photoluminescence (PL). − Silver molybdate (Ag 2 MoO 4 ) is an important member of this family and has two polymorphs: α-Ag 2 MoO 4 with a tetragonal structure and α-Ag 2 MoO 4 , which exhibits a cubic spinel-like structure. ,, Therefore, stick, flower, and potato morphologies have been synthesized for these materials. β-Ag 2 MoO 4 has aroused great interest because of its good chemical stability at high temperatures, in addition to presenting a range of applications in different fields including energy storage, antimicrobial agents, , photocatalysis, , and PL. , However, β-Ag 2 MoO 4 has an effective photon absorption in the ultraviolet region, which is limited to several photonics applications. , For this reason, the insertion of dopants on these materials such as rare-earth metals have been extensively studied .…”

Section: Introductionmentioning

confidence: 99%

“…Although the rare-earth metals are attractive candidates as dopants, a reduction in the availability coupled with demand has led to increased prices for these compounds. Consequently, other metals such as zinc (Zn), cobalt (Co), bismuth (Bi), and copper (Cu) were studied as an alternative dopant. Among these, the copper ions (Cu 2+ or Cu + ) cause specific changes in the crystal lattice structure, mainly because of the Jahn–Teller effect .…”

Section: Introductionmentioning

confidence: 99%

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Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution

et al. 2022

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Corner-truncated cubic β-Ag 1.94 Cu 0.06 MoO 4 microcrystals were synthesized using the hydrothermal method. These were investigated by X-ray diffraction, confirming obtention of the spinel structure Fd3̅ m. Through Raman spectroscopy are confirmed all modes for the point group of O h 7. The E gap shows a decrease of the band gap from 3.20 to 3.07 eV, with reduction of the conduction band occurring from −0.20 eV (β-Ag 2 MoO 4 ) to −0.13 eV (β-Ag 1.94 Cu 0.06 MoO 4 ), suggesting a p-type behavior for the Cu 2+ ion. The fieldemission scanning electron microscopy images confirm the morphological changes for β-Ag 2 MoO 4 , where potato-like microcrystals were found. Meanwhile, corner-truncated cubic microcrystals for β-Ag 1.94 Cu 0.06 MoO 4 . The photoluminescence (PL) spectrum confirms the increase in the PL emission for β-Ag 1.94 Cu 0.06 MoO 4 , with suppression of the deep defects occurring in the structure caused by oxygen and silver atoms. In contrast, the green region is intensified because of distortions of the Ag−O and Mo−O bonds. Therefore, the β-Ag 1.94 Cu 0.06 MoO 4 solid solution has PL emission with CCT (4510 K) and CIE coordinates (x = 0.372 and y = 0.433), which could be interesting properties for applications as light-emitting diodes.

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Section: Methodssupporting

confidence: 62%

“…The normalized intensities are different, suggesting replacement of the Cu 2+ ions. [1][2][3]5 3.3. UV−Vis by DRS.…”

Section: Results Andmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution

et al. 2022

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ZnWO4 nanocrystals prepared by thermal plasma processing

et al. 2023

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Experimental and Theoretical Correlation of Modulated Architectures of β-Ag2MoO4 Microcrystals: Effect of Different Synthesis Routes on the Morphology, Optical, Colorimetric, and Photocatalytic Properties

Lopes

Nolêto

Vieira

et al. 2022

J Inorg Organomet Polym

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In this paper, the effect of different synthesis methods, such as controlled precipitation (CP), sonochemical (SC), hot solution ion injection with fast cooling, and conventional hydrothermal (CH) in obtaining beta-disilver molybdate (β-Ag 2 MoO 4 ) are explained in details. X-ray diffraction patterns, Rietveld refinement data, cluster modeling, micro-Raman, and Fourier transform infrared spectroscopies confirmed that all β-Ag 2 MoO 4 crystals have a spinel-like cubic structure, space group (Fd 3 m), and symmetry point group (O 7 h ). Field emission scanning electron microscopy (FE-SEM) images showed that through different synthetic routes, it is possible to obtain monophasic crystals, such as regular/irregular polyhedrons (cubes, cuboctahedron, trapezohedron, rhombic dodecahedron), potatoes, and non-uniform. The crystal shape observed experimentally was modeled based on Rietveld refinement data and FE-SEM images obtained by KrystalShaper. First-principles quantum mechanical calculations based on density functional theory were employed to modulate the surfaces of the material and to obtain their surface energy (E surf ) values. From these E surf values in association with the Wulff construction, the evolution of the crystals shape was achieved correlating with the experimental results when different synthesis methods are used. Ultraviolet-Visible (UV-Vis) spectroscopy measurements in absorbance mode showed three main absorptions (280, 310, and 340 nm), while the UV-Vis analyses in diffuse reflectance mode showed a tail of energy absorption in the UV spectrum range (3.25 eV and 3.3 eV). The quantitative data from the colorimetric analysis indicated that the β-Ag 2 MoO 4 crystals are desirable for developing inorganic pigments with a beige to brown shade. Photocatalytic assays were performed using four lamps: UV-C, UV-B, UV-A, and visible light. The β-Ag 2 MoO 4 crystals prepared by the CP method showed a higher degradation rate at 85.12% for the rhodamine B dye solution under 240 min exposure to UV-C light.

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Structural refinement, morphology and photocatalytic properties of β-(Ag2−2xZnx)MoO4 microcrystals synthesized by the sonochemical method

Cited by 12 publications

References 93 publications

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution

ZnWO4 nanocrystals prepared by thermal plasma processing

Experimental and Theoretical Correlation of Modulated Architectures of β-Ag2MoO4 Microcrystals: Effect of Different Synthesis Routes on the Morphology, Optical, Colorimetric, and Photocatalytic Properties

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Structural refinement, morphology and photocatalytic properties of β-(Ag2−2xZnx)MoO4 microcrystals synthesized by the sonochemical method

Cited by 12 publications

References 93 publications

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag1.94Cu0.06MoO4 Solid Solution

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag1.94Cu0.06MoO4 Solid Solution

ZnWO4 nanocrystals prepared by thermal plasma processing

Experimental and Theoretical Correlation of Modulated Architectures of β-Ag2MoO4 Microcrystals: Effect of Different Synthesis Routes on the Morphology, Optical, Colorimetric, and Photocatalytic Properties

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Product

Resources

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Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution

Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-Ag_1.94Cu_0.06MoO₄ Solid Solution