Atomic Diffusion Induced by Electron-Beam Irradiation: An in Situ Study of Ag Structures Grown from alpha-Ag2WO4

Autor(es)

Sczancoski, Julio C. ^[1] ; Maya-Johson, Santiago ^[2] ; Pereira, Wyllamanney da Silva ^[1] ; Longo, Elson ^[1] ; Leite, Edson R. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Chem, Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Dept Mat Engn, Sao Carlos, SP - Brazil

^[3] CNPEM, Brazilian Nanotechnol Natl Lab LNNano, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Crystal Growth & Design; v. 19, n. 1, p. 106-115, JAN 2019.
• Citações Web of Science: 1

Resumo

In this paper, we investigate the structural and morphological changes caused by the electron-beam irradiation that led to the growth of complex extruded filaments on the surfaces of alpha-Ag2WO4. To provide a complete description of this phenomenon, both scanning electron microscope (SEM) and transmission electron microscope (TEM) were employed in this study. Our experimental results evidenced that the extruded material was able to exhibit growth on different crystallographic faces, depending on the kind of microscope adopted during the electron-beam irradiation. For a more complete analysis, different electron-beam current densities in TEM were used to investigate all in situ modifications in the microcrystals. For the first time, besides the metallic silver, the presence of silver oxides (Ag2O and Ag3O4) were detected in the composition of extruded material. The diffusion mechanisms related to morphological modifications in the samples irradiated in SEM and TEM were discussed in detail. The coprecipitation reaction in dimethyl sulfoxide was chosen as the synthetic route, which favored the appearance of rectangular rod-like alpha-Ag2WO4 microcrystals. A growth mechanism was proposed to explain the formation and growth processes of these microcrystals. (AU)

• Processo FAPESP: 16/23663-3 - Nanopartículas de pirofosfatos estabilizados por aminoácidos controladas por auto-montagem
• Beneficiário: Wyllamanney da Silva Sczancoski
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - 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: 15/11917-8 - Estudo das Propriedades Fotoluminescentes e Fotocatalíticas do Ag4P2O7, Ag3-2xNixPO4 e Ag3-2xCuxPO4
• Beneficiário: Wyllamanney da Silva Sczancoski
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/07044-9 - Estudo de Microscopia Eletrônica de Transmissão in-situ de reações em alta temperatura de óxidos mistos nano estruturados.
• Beneficiário: Santiago Maya Johnson
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/14004-5 - Investigação das propriedades fotoluminescentes e fotocatalíticas de pós de BaWO4 e BaMoO4 puros e dopados com Mn, Cu e Zn
• Beneficiário: Júlio César Sczancoski
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado