Microwave-assisted hydrothermal synthesis of Ag-2(W1-xMox)O-4 heterostructures: Nucleation of Ag, morphology, and photoluminescence properties

Autor(es)

Silva, M. D. P. ^[1] ; Goncalves, R. F. ^[2] ; Nogueira, I. C. ^[3] ; Longo, V. M. ^[4] ; Mondoni, L. ^[1] ; Moron, M. G. ^[1] ; Santana, Y. V. ^[5] ; Longo, E. ^[6]

Afiliação do(s) autor(es)

^[1] LIEC Univ Fed Sao Carlos, BR-13565905 Sao Carlos, SP - Brazil

^[2] UNIFESP Univ Fed Sao Paulo, BR-09972270 Diadema, SP - Brazil

^[3] IFMA Inst Fed Maranhao, BR-65030005 Sao Luis, MA - Brazil

^[4] Univ Sao Paulo, BR-13566590 Sao Carlos, SP - Brazil

^[5] UTFPR Univ Tecnol Fed Parana, BR-86300000 Cornellio Procopio, PR - Brazil

^[6] LIEC IQ Univ Estadual Paulista, BR-14801907 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 153, p. 428-435, JAN 15 2016.
• Citações Web of Science: 1

Resumo

Ag2W1-xMoxO4 (x = 0.0 and 0.50) powders were synthesized by the co-precipitation (drop-by-drop) method and processed using a microwave-assisted hydrothermal method. We report the real-time in situ formation and growth of Ag filaments on the Ag2W1-xMoxO4 crystals using an accelerated electron beam under high vacuum. Various techniques were used to evaluate the influence of the network-former substitution on the structural and optical properties, including photoluminescence (PL) emission, of these materials. X-ray diffraction results confirmed the phases obtained by the synthesis methods. Raman spectroscopy revealed significant changes in local order-disorder as a function of the network-former substitution. Field-emission scanning electron microscopy was used to determine the shape as well as dimensions of the Ag2W1-xMoxO4 heterostructures. The PL spectra showed that the PL-emission intensities of Ag2W1-xMoxO4 were greater than those of pure Ag2WO4, probably because of the increase of intermediary energy levels within the band gap of the Ag2W1-xMoxO4 heterostructures, as evidenced by the decrease in the band-gap values measured by ultraviolet-visible spectroscopy. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• 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