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Title: Microwave-assisted hydrothermal synthesis of ag-2(w1-xmox)o-4 heterostructures: nucleation of ag, morphology, and photoluminescence properties
Authors: Silva, M. D. P.
Gonçalves, Rosana de Fátima [UNIFESP]
Nogueira, I. C.
Longo, V. M.
Mondoni, L.
Moron, M. G.
Santana, Y. V.
Longo, Elson
Keywords: Ag2wo4
Raman SpectroscopyPhotocatalytic Properties
Rietveld Refinement
Powder Diffraction
Silver Tungstate
Issue Date: 2016
Publisher: Biomed Central Ltd
Citation: Spectrochimica Acta Part A-Molecular And Biomolecular Spectroscopy. Oxford, v. 153, p. 428-435, 2016.
Abstract: 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.
ISSN: 1386-1425
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