Heterostructures based on semiconductor nanocrystals: synthesis and evaluation for...
| Full text | |
| 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 type: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support type: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |