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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Selective Synthesis of alpha-, beta-, and gamma-Ag2WO4 Polymorphs: Promising Platforms for Photocatalytic and Antibacterial Materials

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Alvarez-Roca, Roman [1] ; Gouveia, Amanda Fernandes [2, 3] ; de Foggi, Camila Cristina [1] ; Lemos, Pablo Santana [1] ; Gracia, Lourdes [3] ; da Silva, Luis Fernando [4] ; Vergani, Carlos Eduardo [5] ; San-Miguel, Miguel [2] ; Longo, Elson [2, 1] ; Andres, Juan [3]
Total Authors: 10
[1] Univ Fed Sao Carlos, CDMF, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[3] Jaume I Univ, Dept Phys & Analyt Chem, Castellon de La Plana 12071 - Spain
[4] Univ Fed Sao Carlos, Phys Dept, BR-13565905 Sao Carlos, SP - Brazil
[5] Sao Paulo State Univ Unesp, BR-14801903 Araraquara, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Inorganic Chemistry; v. 60, n. 2, p. 1063-1080, JAN 18 2021.
Web of Science Citations: 0

Silver tungstate (Ag2WO4) shows structural polymorphism with different crystalline phases, namely, orthorhombic, hexagonal, and cubic structures that are commonly known as alpha, beta, and gamma, respectively. In this work, these Ag2WO4 polymorphs were selectively and successfully synthesized through a simple precipitation route at ambient temperature. The polymorph-controlled synthesis was conducted by means of the volumetric ratios of the silver nitrate/tungstate sodium dehydrate precursors in solution. The structural and electronic properties of the as-synthesized Ag2WO4 polymorphs were investigated by using a combination of Xray diffraction and Rietveld refinements, X-ray absorption spectroscopy, X-ray absorption near-edge structure spectroscopy, field-emission scanning electron microscopy images, and photoluminescence. To complement and rationalize the experimental results, first-principles calculations, at the density functional theory level, were carried out, leading to an unprecedented glimpse into the atomic-level properties of the morphology and the exposed surfaces of Ag2WO4 polymorphs. Following the analysis of the local coordination of Ag and W cations (clusters) at each exposed surface of the three polymorphs, the structure-property relationship between the morphology and the photocatalytic and antibacterial activities against amiloride degradation under ultraviolet light irradiation and methicillin-resistant Staphylococcus aureus, respectively, was investigated. A possible mechanism of the photocatalytic and antibacterial activity as well the formation process and growth of the polymorphs is also explored and proposed. (AU)

FAPESP's process: 17/19548-7 - CDMF - Center for the Development of Functional Materials
Grantee:Román Alvarez Roca
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/13507-2 - Characterization and antimicrobial activity of Ag2WO4 film deposited by femtosecond laser on titanium surface
Grantee:Camila Cristina de Foggi
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 19/01732-1 - Photocatalytic activity of multifunctional semiconductors: influence of morphology and electron injection
Grantee:Amanda Fernandes Gouveia
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/23891-6 - Computer modeling of condensed matter
Grantee:Alex Antonelli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/12594-3 - CDMF - Center for the Development of Functional Materials
Grantee:Camila Cristina de Foggi
Support Opportunities: Scholarships in Brazil - Post-Doctorate