Structure, optical properties, and photocatalytic activity of α-Ag2W0.75Mo0.25O4

Penha, Maya; Gouveia, Amanda Fernandes; Teixeira, Mayara Mondego; Oliveira, Regiane Cristina de; Assis, Marcelo; Yokaichya, F.; Santos, Clayane Carvalho dos; Gonçalves, Roger; Li, M. Siu; San-Miguel, Miguel A.; Andrés, Juán; Longo, E.

doi:10.1016/j.materresbull.2020.111011

Cited by 9 publications

(5 citation statements)

References 56 publications

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“…The β-Ag 2 MoO 4 was related to ICSD card no. 238013, with cubic structure and Fd3m space group (Foggi et al, 2020;Penha et al, 2020). In all cases, no additional phases were observed, indicating the high purity of the materials.…”

Section: Microcrystal Characterizationmentioning

confidence: 86%

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Pimentel

Marin-Dett

Assis

et al. 2022

Front. Bioeng. Biotechnol.

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Fungal infections have become a major concern in the medical community, especially those caused by Candida spp. Within this species, Candida albicans stands out for being an opportunistic commensal fungus that can cause superficial and invasive infections. Current antifungal therapy involves the local and/or systemic use of drugs such as azoles, polyenes, and echinocandins. These antifungals are based on highly specific target sites, and the development of resistance may occur with changes in the enzymatic pathways that serve as the drug targets. Thus, the development of new antifungal drugs is highly recommended to prevent drug resistance. The present investigation evaluated the antifungal activity of silver-containing microcrystals such as silver vanadate (α-AgVO3), silver tungstate (α-Ag2WO4), and silver molybdate (β-Ag2MoO4). In addition to having antimicrobial activity, such compounds should not cause damage to underlying tissues. Thus, to better assess the biocompatibility of new compounds, a new three-dimensional (3D) coculture model involving three cell lines was developed. The validation of the model was based on fluorescent markers and confocal laser microscopy. The biocompatibility of silver-containing microcrystals was evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. 3D coculture was infected with C. albicans biofilm and challenged with α-AgVO3, α-Ag2WO4, and β-Ag2MoO4. The action of microcrystals on C. albicans biofilm was evaluated by colony-forming units (CFU/ml) and LIVE/DEAD staining. In addition, production of proinflammatory cytokines interleukin 6 (IL-6), IL-8, IL-1β, and tumor necrosis factor α (TNF-α) was measured by cytometric bead array kit using flow cytometry. The 3D coculture model described here proved to be adequate to assess both the biocompatibility of the new materials and the infectious processes. Regarding the biocompatibility of the microcrystals, only α-AgVO3 (15.62 µg/ml) showed a decrease in cell viability. The antibiofilm activity of α-Ag2WO4 was similar to that of the standard drug (fluconazole). Although α-Ag2WO4 was able to induce the production of IL-6, IL-8, and IL-1β, no differences in cytokine production were observed between noninfected and infected models treated with this microcrystal. β-Ag2MoO4 inhibits the production of TNF-α in the infected model; however, it showed no antibiofilm activity. Based on the biocompatibility and antifungal findings, α-Ag2WO4 is a promising material for treating C. albicans infection.

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Section: Microcrystal Characterizationmentioning

confidence: 86%

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Pimentel

Marin-Dett

Assis

et al. 2022

Front. Bioeng. Biotechnol.

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Section: Solid Solutions and Dopingmentioning

confidence: 99%

“…Additionally, a W chemical substitution in a-Ag 2 W 0$75-Mo 0$25 O 4 has been described [147]. These solid solutions were prepared via the MAH [145,147,149] and CP [148] and tetracycline (TC) antibiotic [145] and RhB dye [147]. When the MAH [145,147] method is used, in the samples obtained at the longest microwave irradiation time, the number of structural defects was increased.…”

Section: Solid Solutions and Dopingmentioning

confidence: 99%

Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

Gouveia

Roca

Macedo

et al. 2022

Journal of Materials Research and Technology

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“…Molybdenum oxide compounds are a well-known semiconductor family that has been investigated for several applications such as catalysts, 1−5 sensors, 6,7 photocatalysts, 1,8 microbial agents, 9,10 and photoluminescence (PL). 11−13 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.…”

Section: Introductionmentioning

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%

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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Structure, optical properties, and photocatalytic activity of α-Ag2W0.75Mo0.25O4

Cited by 9 publications

References 56 publications

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

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

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Structure, optical properties, and photocatalytic activity of α-Ag2W0.75Mo0.25O4

Cited by 9 publications

References 56 publications

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Antifungal Activity and Biocompatibility of α-AgVO3, α-Ag2WO4, and β-Ag2MoO4 Using a Three-Dimensional Coculture Model of the Oral Mucosa

Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

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

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