lpha-Ag2WO4 under microwave, electron beam and femtosecond laser irradiations: Unveiling the relationship between morphology and photoluminescence emission

Autor(es):Mostrar menos -

Teixeira, Mayara Mondego ^[1] ; Santos, Lilian Cruz ^[1] ; Tello, Ana Cristina Mora ^[1] ; Almeida, Priscila Barros ^[1] ; da Silva, Jussara Soares ^[1] ; Laier, Leticia ^{[2, 3]} ; Gracia, Lourdes ^[4] ; Teodoro, Marcio Daldin ^[5] ; da Silva, Luis Fernando ^[5] ; Andres, Juan ^[2] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, CDMF, BR-13565905 Sao Carlos - Brazil

^[2] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain

^[3] UNESP, Inst Quim, Dept Fis Quim, Lab Interdisciplinar Ceram, BR-14800900 Araraquara, SP - Brazil

^[4] Univ Valencia, Dept Quim Fis, Burjassot 46100 - Spain

^[5] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 903, MAY 15 2022.
• Citações Web of Science: 0

Resumo

In this study, the alpha-Ag2WO4 samples were successfully synthesized combined two methods, co-precipitation and microwave-assisted hydrothermal. Later, two different irradiation processes: electron beam and femtosecond laser are applied. Unit cell changes were shown by X-ray measurements and Rietveld analysis and compared with the results obtained for first-principle calculations. The formation of oxygen vacancies on the surface of the particles after the irradiation process was revealed by XPS measurements. Electron beam and femtosecond laser irradiations were found to cause expansion of the unit cell, form oxygen vacancies on the surface, change the angle and distance between O-Ag and O-W bonds, and modify the particle morphology to rod-, cube- and sphere-like. The XANES measurements confirm that the local order of the W atoms is maintained along the different irradiation processes. Based on the theoretical analysis of surfaces investigation and Wulff construction, the contribution of (010) and (101) surfaces at the emission centers in 550 and 733 nm associated with the PL spectrum of alpha-Ag2WO4, was established (C) 2022 Published by Elsevier B.V. (AU)

• 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