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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Inorganic Chemistry; v. 60, n. 2, p. 1063-1080, JAN 18 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 17/19548-7 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Román Alvarez Roca
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/13507-2 - Caracterização e atividade antimicrobiana de filmes de Ag2WO4 depositados por laser de fentossegundo em superfície de titânio
• Beneficiário: Camila Cristina de Foggi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 19/01732-1 - Atividade fotocatalítica de semicondutores multifuncionais: influência da morfologia e injeção de elétrons
• Beneficiário: Amanda Fernandes Gouveia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 16/23891-6 - Modelagem computacional da matéria condensada
• Beneficiário: Alex Antonelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/12594-3 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Camila Cristina de Foggi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado