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Time-resolved photoluminescence spectroscopy at low temperatures is used to study the 2.3 eV emission induced by treatments causing oxygen loss in YBa_2Cu_3O_(7-x). The decay shows a biexponential behavior with components of 34 and 87 mus at 10 [...]texto impreso
Garcia, J. A. ; Remon, A. ; Urchulutegui, M. ; Piqueras de Noriega, Javier ; Jiménez, J. ; Torres, A. | Wiley-V C H Verlag Gmbh | 1997-02-16Infrared luminescence of Bi2Sr2CaCu2Ox ceramics, in the range 800 to 1800 nm (0.7 to 1.5 eV) has been investigated by photoluminescence and cathodoluminescence in the scanning electron microscope (SEM). Untreated samples do not show infrared lum[...]texto impreso
Albrecht, M. ; Cremades Rodríguez, Ana Isabel ; Krinke, J. ; Christiansen, S. ; Ambacher, O. ; Piqueras de Noriega, Javier ; Strunk, H. P. ; Stutzmann, M. | Wiley-V C H Verlag Gmbh | 1999-11We analyse the recombination and scattering at dislocations in Si doped AlGaN layers by transmission electron microscopy (TEM), electron beam induced current (EBIC) and cathodoluminescence. We show that c-type screw dislocations are nonradiative[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Remon, A. ; Garcia, J. A. ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 1997-10Cathodoluminescence (CL) and photoluminescence (PL) of nickel oxide (NiO) have been investigated. The observed emission bands in the visible and near infrared spectral ranges are attributed to Ni^(2+) intraionic transitions. Some of the features[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Sanchez, M. ; Piqueras de Noriega, Javier ; Golubev, VG. | Wiley-V C H Verlag Gmbh | 2003-01In this study, three-dimensional ordered synthetic opals formed by spheres of 230 nm impregnated with GaN have been investigated. In some of the samples gold and platinum were also introduced. The potential applications of GaN-opal assemblies in[...]texto impreso
Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Jäger, Wolfgang ; Häußler , Dietrich | Wiley-V C H Verlag Gmbh | 2012-08Al-doped micro- and nanostructures have been grown by an evaporation–deposition method with a mixture of ZnS and Al_2O_3 powders as precursor. It has been found that the presence of Al is the cause of the growth of complex morphologies, as rods [...]texto impreso
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We show that optical properties of linear molecular aggregates undergo drastic changes when aggregates are deposited on a metal surface. The dipole-dipole interactions of monomers with their images can result in strong re-structuring of both the[...]texto impreso
Miroiu, F. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2006Fabrication of low dimensional structures of II-VI compounds as nanoparticles and elongated structures, such as nanowires or nanotubes, is a subject of increased interest due to their potential use in different technological applications. The ai[...]texto impreso
López, Iñaki ; Nogales Díaz, Emilio ; Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2012-01The field emission properties of gallium oxide nanowires grown by thermal evaporation-deposition have been investigated inside the chamber of a scanning electron microscope. Turn on electric fields and enhancement factors have been determined fo[...]texto impreso
Piqueras de Noriega, Javier ; Ryu, Y. K. ; Fernández Sánchez, Paloma | Wiley-V C H Verlag Gmbh | 2011-04Er-doped ZnO nano- and microstructures have been grown by thermal treating of compacted mixtures of ZnO and Er_2O_3 powders and their optical properties have been studied by cathodoluminescence (CL). Annealing the pressed samples leads to the gr[...]texto impreso
Gonzalo, Alicia ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2014-02Mn doped –Ga_2O_3 nanowires have been obtained by a thermal evaporation method on a gallium oxide substrate. The growth temperature has been varied in the range 1300-1500 ºC. The morphology of the resulting structures has been found to depend on[...]texto impreso
Gómez, P. ; Piqueras de Noriega, Javier ; Remon, A. ; Garcia, J. A. ; Jiménez, J. ; Torres, A. | Wiley-V C H Verlag Gmbh | 1996-10-16The effect of vacuum thermal annealing and electron irradiation on the luminescence of Bi_2Sr_2CaCu-2O_x ceramics has been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM), time-resolved photoluminescence (PL), [...]texto impreso
Radoi, R. ; Andrés, M. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2004-11ZnSe powder has been ball milled in different conditions to investigate the formation of a nanocrystalline structure. The effect of mechanical milling on the luminescent and structural properties of ZnSe has been studied by means of cathodolumin[...]texto impreso
Polo, Lorena ; Gómez-Cerezo, Natividad ; García-Fernández, Alba ; Aznar, Elena ; Vivancos, Jose Luis ; Arcos Navarrete, Daniel ; Vallet Regí, María ; Martinez-Martinez, Ramon | Wiley-V C H Verlag Gmbh | 2018-09-10Increase of bone diseases incidence has boosted the study of ceramic biomaterials as a potential osteo-inductive scaffolds. Particularly, mesoporous bioactive glasses have demonstrated to possess a broad application in the bone regeneration fiel[...]
