Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R | IOP publishing ltd | 2001-09Scanning tunnelling microscopy (STM) has been sometimes applied in recent years to characterize porous silicon. In contrast, other forms of light emitting Si, such as nanocrystalline silicon films, prepared by different methods, have not been, o[...]![]()
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Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Sekiguchi, T. | IOP publishing ltd | 2001-07Bulk ZnO single crystals grown by the hydrothermal and flux methods have been characterized by scanning tunnelling spectroscopy performed in the different crystalline faces. Normalized differential conductance has been found to depend on the fac[...]![]()
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Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Ortega Villafuerte, Yanicet | IOP publishing ltd | 2011-08Al-doped ZnO nanorod networks and other microstructures have been grown by a thermal evaporation–deposition method with a mixture of ZnS and Al_2O_3 powders as precursor. Some of the grown structures consist of star-like arrays of nanorods arran[...]![]()
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Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Elsever Science | 2009-03-15Sintering of a ZnS-SnO(2) mixture under argon flow leads to the growth of columnar nanoplate arrays as well as arrays of nanowires, nanorods and nanoplates with six-fold symmetry. The six-fold nanoplate structures correspond to a more advanced s[...]![]()
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Chioncel, M. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2008-12-15?-Fe_2O_3 (hematite) nanostructures with various morphologies have been grown by thermal oxidation of compacted iron powder at temperatures between 700 and 900 degrees C. Different thermal treatments have been found to induce the growth of singl[...]![]()
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Alonso Orts, Manuel ; Sanchez, Ana M ; Hindmarsh, Steven A ; López, Iñaki ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Amer Chemical Soc | 2017-01-11Tailoring the shape of complex nanostructures requires control of the growth process. In this work, we report on the selective growth of nanostructured tin oxide on gallium oxide nanowires leading to the formation of SnO_2/Ga_2O_3 complex nanost[...]![]()
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MgO crystals have been studied by scanning?electron acoustic microscopy under different experimental conditions. Contrast mechanisms in imaging are discussed and compared. The experimental results obtained by earthing or nonearthing the specimen[...]![]()
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Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma | World Scientific Publ Co Pte Ltd | 2007Sintering of ZnO-SnO_2 and ZnO-MgO mixtures, with few at. % of Sn or Mg at 1280 C under argon flaw leads to the growth of microrods on the sample surface, which are formed by oriented stacks of nanoplates. Energy dispersive spectroscopy and cath[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2008-11-12Sn doped GeO_2 nanowires and microwires have been grown by an evaporation-deposition method, using a mixture of Ge and SnO_2 powders as precursors. Comparison with undoped GeO_2 nanowires grown by the same method shows that the presence of Sn pr[...]![]()
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Vicent López, José Luis ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Dieguez, E. | Elsevier Science B.V. | 2006-08-01Dilute Te-doped GaSb alloys have been prepared by the vertical feeding method (VFM) using both casting and feeding configurations. The structural and optical properties of the samples were characterized by etching, X-ray diffraction and cathodol[...]![]()
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Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco ; De Diego, N. | Amer Inst Physics | 1988-11-01Cathodoluminiscence (CL) scanning electron microscopy and positron annihilation techniques have been used to investigate the distribution of defects in GaAs: Te wafers. Dislocation density and near-band-edge CL profiles along the wafer have di[...]![]()
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Pal, U. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Serrano, M. D. ; Dieguez, E. | IOP publishing ltd | 1994The nature of the 1.4eV band in CdTe is studied by cathodoluminescence. Results indicate that the band is not related only to surface defects.![]()
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Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco ; Monteiro, T. ; Pereira, E. | Elsevier Science SA | 1993-09Cathodoluminescence (CL) from untreated as well as heat-treated GaP:Te:Mn samples has been investigated. Spectra of untreated samples present two emission bands that peak at 585 and 730 nm. The CL image shows bright spots associated with disloca[...]![]()
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Castaldini, A. ; Calvallini, A,. ; Fraboni, B ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Amer Inst Physics | 1994-07-15The distribution in liquid-encapsulated-Czochralski (LEC) GaAs:Te wafers of point and complex defects has been investigated together with their influence on the minority-carrier diffusion length L. Three wafers with different Te-doping concentra[...]