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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 6
Document type: Journal article
Source: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 153, p. 428-435, JAN 15 2016.
Web of Science Citations: 1
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. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC