Influence of Cu substitution on the structural ordering, photocatalytic activity and photoluminescence emission of Ag Cu PO4 powders

Pereira, Wyllamanney da Silva; Sczancoski, J. C.; Calderon, Yormary N.C.; Mastelaro, Valmor Roberto; Botelho, Gleice; Machado, Thales R.; Leite, E. R.; Longo, Elson

doi:10.1016/j.apsusc.2017.12.202

Cited by 25 publications

(11 citation statements)

References 107 publications

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“…An analysis of the results verifies that small and well‐dispersed nanoparticles were formed near the initial Ag nanorod (eAP) or Ag irregular spheres (lAP) a few nanometers away from the initial Ag NPs. The HRTEM images in the insets of both figures demonstrate an interplanar distance of 0.23 nm for these particles, which can be associated with the (111) plane of cubic metallic Ag . Thus, the exposure of a secondary electron beam from TEM leads to the growth of metallic Ag from the initial particles obtained in the eAP and lAP samples.…”

Section: Resultsmentioning

confidence: 86%

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Santos

Assis

Machado

et al. 2019

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In this work, for the first time, the instantaneous nucleation and growth processes of Ag nanoparticles on Ag3PO4 mediated by femtosecond laser pulses are reported and analyzed. The investigated samples are pure Ag3PO4 sample, electron‐irradiated Ag3PO4 sample, and laser‐irradiated sample. Complete characterization of the samples is performed using X‐ray diffraction (XRD), Rietveld refinements, field emission scanning electron microscopy, and energy dispersive spectroscopy (EDS). XRD confirms that the irradiated surface layer remains crystalline, and according to EDS analysis, the surface particles are composed primarily of Ag nanoparticles. This method not only offers a one‐step route to synthesize Ag nanoparticles using laser‐assisted irradiation with particle size control, but also reports a complex process involving the formation and subsequent growth of Ag nanoparticles through an unexpected additive‐free in situ fabrication process.

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Section: Resultsmentioning

confidence: 86%

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Santos

Assis

Machado

et al. 2019

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“…The E gap of the Ag 3 PO 4 and NiO samples are in accordance with previous reports. 7,33,34,45,46 The band gap of the composites narrowed slightly as compared to that of Ag 3 PO 4 with enhanced light absorption. Among the composites, AgNi75 showed the lowest band gap (E gap = 1.7 eV), probably associated with the introduction of surface defects caused by the greater amount of NiO during the in situ precipitation of Ag 3 PO 4 , which can lead to a strong interaction between semiconductors, facilitating the formation of an interaction between the NiO and Ag 3 PO 4 phases.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

“… 2 − 6 Since the discovery of the Ag 3 PO 4 semiconductor, many mechanisms such as cation/anion doping, composite construction, metal deposition, and immobilization with support materials have been studied to increase its stability and photocatalytic properties. 3 , 4 , 7 − 9 …”

Section: Introductionmentioning

confidence: 99%

“…Its narrow band gap of ∼2.4 eV enables the use of visible-light radiation that represents approximately 43% of the solar spectrum. Therefore, Ag 3 PO 4 is a promising candidate for application in visible light-driven photocatalysts primarily for the degradation of organic pollutants and water splitting. − Since the discovery of the Ag 3 PO 4 semiconductor, many mechanisms such as cation/anion doping, composite construction, metal deposition, and immobilization with support materials have been studied to increase its stability and photocatalytic properties. ,,− …”

Section: Introductionmentioning

confidence: 99%

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Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

et al. 2020

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Black NiO powders were prepared by a hydrothermal method. Moreover, the visible light-driven Ag 3 PO 4 /NiO photocatalyst composites were successfully synthesized by in situ precipitation method. These samples were structurally characterized by X-ray diffraction and Rietveld refinement. The strong interaction between the phases and the defects in the samples was affected by the formation of the composites, as identified by Fourier transform infrared spectroscopy and Raman spectroscopy. UV–vis diffuse reflectance spectroscopy exhibited enhanced light absorption for all Ag 3 PO 4 /NiO composites, suggesting the effective interaction between the phases. Moreover, field-emission scanning electron microscopy images revealed the presence of NiO microflowers composed of nanoflakes in contact with Ag 3 PO 4 microparticles. The composite with 5% NiO presented enhanced photocatalytic efficiency in comparison with pure Ag 3 PO 4 , degrading 96% of rhodamine B (RhB) dye in just 15 min under visible light; however, the recycling experiments confirmed that the composite with 75% NiO showed superior stability. The recombination of the electron–hole pairs was considered for the measurement of the photoluminescence of the samples. These measurements were performed to evaluate the possible causes for the difference in the photocatalytic responses of the composites. From these experimental results, possible photocatalytic mechanisms for RhB degradation over Ag 3 PO 4 /NiO composites under visible-light irradiation were proposed.

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“…The partial replacement of cations in the host matrix by copper ions resulted in solid solutions with interesting properties, mainly regarding the photocatalytic, − magnetic, electrical, and optical properties . Moreover, the investigation of copper-doped silver tungstate was completely absent in the literature until now.…”

Section: Introductionmentioning

confidence: 99%

Ag_2–xCu_xWO₄ Solid Solution: Structure, Morphology, Optical Properties, and Photocatalytic Performance in the Degradation of RhB under Blue Light-Emitting Device Irradiation

et al. 2021

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We initially reported the synthesis, characterization of structural, optical, morphological, and photocatalytic properties of Ag 1.98 Cu 0.02 WO 4 solid solution in this work. The results were compared with the same characterizations performed in pure silver tungstate. Both materials exhibited an orthorhombic structure, with a high degree of crystallinity and purity. Although, a small number of copper atoms in the orthorhombic unit cell of Ag 1.98 Cu 0.02 WO 4 were detected by changes in the X-ray diffraction peak intensity and shift in peak positions corroborates with changes observed in micro-Raman active modes. The decrease in the optical band gap, α-Ag 2 WO 4 (3.05 ± 0.03 eV) to α-Ag 1.98 Cu 0.02 WO 4 (2.93 ± 0.01 eV), determined by diffuse reflectance spectroscopy, confirms the insertion of intermediate levels between valence and conduction bands that could be associated with the Jahn−Teller effect of copper. Field-emission scanning electron microscopy images show several rod-like microcrystals for α-Ag 2 WO 4 , while there are heterogeneous microcrystals for Ag 1.98 Cu 0.02 WO 4 solid solution with an inherent polyhedral shape. The highest photocatalytic performance of α-Ag 1.98 Cu 0.02 WO 4 in the degradation of RhB molecules under visible blue light-emitting device irradiation was achieved at the end of 120 min, therefore 10.61 times faster than pure α-Ag 2 WO 4 and 37.77 times than the photolysis experiment. Through the photocatalytic experiments using the scavenger radicals, the contribution of holes (h + ), singlet oxygen ( 1 O 2 ), superoxide radicals (O 2•− ), and hydroxyl radicals ( • OH) were evaluated, where the holes (h + ), singlet oxygen ( 1 O 2 ), and superoxide radicals (O 2•− ) show the main contribution in the photocatalytic degradation of the RhB molecules to colorless organic compounds, carbon dioxide (CO 2 ), and water (H 2 O).

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Influence of Cu substitution on the structural ordering, photocatalytic activity and photoluminescence emission of Ag Cu PO4 powders

Cited by 25 publications

References 107 publications

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag_2–xCu_xWO₄ Solid Solution: Structure, Morphology, Optical Properties, and Photocatalytic Performance in the Degradation of RhB under Blue Light-Emitting Device Irradiation

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Influence of Cu substitution on the structural ordering, photocatalytic activity and photoluminescence emission of Ag Cu PO4 powders

Cited by 25 publications

References 107 publications

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag3PO4 Induced by Electron Beam and Femtosecond Laser

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag3PO4 Induced by Electron Beam and Femtosecond Laser

Ag3PO4/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag2–xCuxWO4 Solid Solution: Structure, Morphology, Optical Properties, and Photocatalytic Performance in the Degradation of RhB under Blue Light-Emitting Device Irradiation

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Product

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Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Proof‐of‐Concept Studies Directed toward the Formation of Metallic Ag Nanostructures from Ag₃PO₄ Induced by Electron Beam and Femtosecond Laser

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag_2–xCu_xWO₄ Solid Solution: Structure, Morphology, Optical Properties, and Photocatalytic Performance in the Degradation of RhB under Blue Light-Emitting Device Irradiation