Microwave-assisted hydrothermal synthesis of ag-2(w1-xmox)o-4 heterostructures: nucleation of ag, morphology, and photoluminescence properties

Microwave-assisted hydrothermal synthesis of ag-2(w1-xmox)o-4 heterostructures: nucleation of ag, morphology, and photoluminescence properties

Author Silva, M. D. P. Google Scholar
Gonçalves, Rosana de Fátima Autor UNIFESP Google Scholar
Nogueira, I. C. Google Scholar
Longo, V. M. Google Scholar
Mondoni, L. Google Scholar
Moron, M. G. Google Scholar
Santana, Y. V. Google Scholar
Longo, Elson Google Scholar
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.
Keywords Ag2wo4
Ag2moo4
Photoluminescence
Morphology
Raman SpectroscopyPhotocatalytic Properties
Rietveld Refinement
Powder Diffraction
Silver Tungstate
Alpha-Ag2wo4
Nanorods
Growth
Semiconductor
Nanowires
Stability
Language English
Sponsor CNPq [573636/2008-7]
FAPESP [2013/07296-2]
INCTMN [2008/57872-1]
FAPEMA [176570/2013]
CAPES
Grant number CNPq: 573636/2008-7
FAPESP: 2013/07296-2
INCTMN: 2008/57872-1
FAPEMA: 176570/2013
Date 2016
Published in Spectrochimica Acta Part A-Molecular And Biomolecular Spectroscopy. Oxford, v. 153, p. 428-435, 2016.
ISSN 1386-1425 (Sherpa/Romeo, impact factor)
Publisher Biomed Central Ltd
Extent 428-435
Origin https://doi.org/10.1016/j.saa.2015.08.047
Access rights Closed access
Type Article
Web of Science ID WOS:000365360700055
URI http://repositorio.unifesp.br/handle/11600/49187

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