Mostrar el registro sencillo del ítem
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence
dc.contributor.author | De Santana, Yuri V. B. | |
dc.contributor.author | Cardoso Gomes, José Ernane | |
dc.contributor.author | Matos, Leandro | |
dc.contributor.author | Cruvinel, Guilherme Henrique | |
dc.contributor.author | Perrin, André | |
dc.contributor.author | Perrin, Christiane | |
dc.contributor.author | Andres, Juan | |
dc.contributor.author | Varela, José A. | |
dc.contributor.author | Longo, Elson | |
dc.date.accessioned | 2015-05-25T07:58:18Z | |
dc.date.available | 2015-05-25T07:58:18Z | |
dc.date.issued | 2014 | |
dc.identifier.citation | DE SANTANA, Yuri VB, et al. Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence. Nanomaterials and Nanotechnology, 2014, vol. 4, no. 22 | ca_CA |
dc.identifier.issn | 1847-9804 | |
dc.identifier.issn | 1847-9804 | |
dc.identifier.uri | http://hdl.handle.net/10234/121786 | |
dc.description.abstract | Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 degrees C) and co-precipitation (pH 4, 70 degrees C), and were then used to prepare two core/shell composites, namely alpha-Ag2WO4/beta-Ag2MoO4 (MAH, pH 4, 140 degrees C) and beta-Ag2MoO4/beta-Ag2WO4 (co-precipitation, pH 4, 70 degrees C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the beta-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure alpha-Ag2WO4, while co-precipitation afforded the metastable beta-Ag2WO4 allotrope, coexisting with a weak amount of the alpha-phase. The optical gap of beta-Ag2WO4 (3.3 eV) was evaluated for the first time. In contrast to beta-Ag2MoO4/beta-Ag2WO4, the alpha-Ag2WO4/beta-Ag2MoO4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures. | ca_CA |
dc.description.sponsorShip | The authors are thankful for the financial support of the following Brazilian research financing institutions: CAPES, CNPq and FAPESP CEPID - CDMF 2013/07296-2, FAPESP INCTMN 2008/57872-1, CNPq INCTMN 573636/2008-7, Y. V. B. S. and would like to acknowledgment research support foundation of the state of São Paulo for the post- doctoral process n°: 2012/22823-6. | ca_CA |
dc.format.extent | 10 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | InTech | ca_CA |
dc.relation.isPartOf | Nanomaterials and Nanotechnology, 2014, vol. 4, no. 22 | ca_CA |
dc.rights | © 2004–2015 InTech | ca_CA |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | * |
dc.subject | Silver Molybdate | ca_CA |
dc.subject | Silver Tungstate | ca_CA |
dc.subject | Photoluminescence | ca_CA |
dc.subject | Decorated System | ca_CA |
dc.title | Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | http://dx.doi.org/10.5772/58923 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.relation.publisherVersion | http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/silver-molybdate-and-silver-tungstate-nanocomposites-with-enhanced-photoluminescence | ca_CA |
dc.type.version | info:eu-repo/semantics/publishedVersion | ca_CA |
Ficheros en el ítem
Este ítem aparece en la(s) siguiente(s) colección(ones)
-
QFA_Articles [825]
Articles de publicacions periòdiques