Multi-dimensional architecture of Ag/alpha-Ag2WO4 crystals: insights into microstructural, morphological, and photoluminescence properties

Autor(es):Mostrar menos -

Cruz, Lilian ^[1] ; Teixeira, Mayara M. ^[1] ; Teodoro, Vinicius ^[1] ; Jacomaci, Natalia ^[2] ; Laier, Leticia O. ^[2] ; Assis, Marcelo ^[1] ; Macedo, Nadia G. ^[3] ; Tello, Ana C. M. ^[1] ; Silva, Luis F. ^[4] ; Marques, Gilmar E. ^[4] ; Zaghete, Maria A. ^[2] ; Teodoro, Marcio D. ^[4] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Ctr Dev Funct Mat, Rod Washington Luiz, Km 235, BR-13565904 Sao Carlos, SP - Brazil

^[2] Sao Paulo State Univ, Interdisciplinary Lab Ceram Studies, BR-14800900 Araraquara, SP - Brazil

^[3] Univ Estadual Campinas, Inst Chem, Dept Phys Chem, BR-13083970 Campinas, SP - Brazil

^[4] Univ Fed Sao Carlos, Dept Phys, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CrystEngComm; v. 22, n. 45, p. 7903-7917, DEC 7 2020.
• Citações Web of Science: 0

Resumo

In this study, we report the potential of ethylenediamine (En) in the modification of the morphological, structural, optical and catalytic properties of alpha-Ag2WO4 crystals decorated with Ag nanoparticles (Ag NPs). Experimental techniques were used to characterize the as-synthesized samples such as X-ray diffraction, Raman, electron microscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and photoluminescence spectroscopy. The results confirmed the efficiency of En in the decoration with the formation of Ag/alpha-Ag2WO4 crystals and also the modification of alpha-Ag2WO4 morphology that indicated its influence on the crystal growth mechanism via self-assembly and Ostwald ripening. En affects the degree of order/disorder of the crystalline structures in long and short-ranges. In addition, photoluminescence measurements revealed a blue shift of the optical emission caused by a reduction of oxygen vacancies and an increase in structural disorder due to the En concentration used in the synthesis processes. Regarding the photocatalysis experiments, the reduction in oxygen vacancies also caused a decrease in the photoactivity of alpha-Ag2WO4 against the rhodamine B dye, thus confirming the relevance of oxygen vacancies for the development of alpha-Ag2WO4 photocatalysts. (AU)

• Processo FAPESP: 17/12437-5 - Preparação e caracterização de nanoheterojunções semicondutoras aplicadas como sensores resistivos de gás fotoativados
• Beneficiário: Luís Fernando da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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