Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Plugaru, R ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Institute of Physics | 2004-07-21Polycrystalline samples of titanium oxide were prepared by thermal sintering, in argon and air atmospheres at temperatures ranging from 1100 to 1500 degreesC, from powders of anatase and rutile phases. The samples sintered in argon were further [...]![]()
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Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Piqueras de Noriega, Javier | American Institute of Physics | 1995-12-01We have investigated highly doped GaAs:Te at different doping concentrations (> 10(17) cm(-3)) to assess the presence of the EL2 trap. We have utilized both capacitance and current transient spectroscopy techniques. The crucial parameter for the[...]![]()
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López García, Iñaki ; Cebriano Ramírez, Teresa ; Hidalgo Alcalde, Pedro ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | American Institute of Materials Science (AIMS) | 2016A thermal evaporation method developed in the research group enables to grow and design several morphologies of semiconducting oxide nanostructures, such as Ga_2O_3, GeO_2 or Sb_2O_3, among others, and some ternary oxide compounds (ZnGa_2O_4, Zn[...]![]()
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Vanadium pentoxide (V_2O_5) nanorods and nanotips have been grown without a catalyst by a thermal deposition method using compacted V_2O_5 powder as the starting material. The tips, with diameters of about 50-100 nm, grow on the top of rods of l[...]![]()
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Alemán, B. ; Hidalgo Alcalde, Pedro ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 2009-11-21Bi doped ZnO nanowires and rods have been grown by a catalyst free evaporation-deposition method with precursors containing either ZnO and Bi_2O_3 or ZnS and Bi_2O_3 powders. The use of ZnS as a precursor was found to lead to a higher density of[...]![]()
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Piqueras de Noriega, Javier ; Sotillo Buzarra, Belén ; Fernández Sánchez, Paloma | Elsevier Science B.V. | 2012-06-01ZnS nanowires and nanoribbons have been obtained by the vapor–solid (VS) method. The morphology depends mainly on the deposition temperature; nanowires are grown at temperatures between 300 °C and 650 °C while the growth of nanoribbons takes pla[...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Gregorati, Luca | American Institute of Physics | 2008-05-01In-doped SnO_2 microtubes as well as Sn-doped In_2O_3 (ITO) nano- and microislands have been grown by thermal treatment of compacted SnO_2-In_2O powders under argon flow at 1350 degrees C in a catalyst-free process. The SnO_2 tubes contain about[...]![]()
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Bartolomé Vílchez, Javier ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Royal Soc. Chemistry | 2013Indium oxide microcrystals with shapes of truncated cubes and pyramids as well as microrods with square, triangular or hexagonal cross-sections are grown by a catalyst free evaporation deposition method. Size and shape control of the crystals as[...]![]()
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Magdas, Dana A. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2006-11-01Elongated In2O3 micro- and nanostructures have been grown by two-step thermal treatments of compacted InN powder, at temperatures between 350 and 700 degrees C. Different thermal treatments have been found to induce the growth of structures with[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Castaldini, A. ; Cavallini, A. ; Polenta, L. | American Institute of Physics | 2003-08-15Time-resolved cathodoluminescence (TRCL) and photocurrent (PC) spectroscopies have been applied to the study of the yellow band of Si-doped GaN. Measurements carried out combining both techniques unambiguously reveal the complex nature of this b[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Cavallini, A. | Amer Inst Physics | 2003-03-31The temporal behavior of deep-level luminescence emissions in undoped hydride-vapor-phase-epitaxy GaN layers of different thicknesses has been investigated by time-resolved cathodoluminescence (TRCL). The complex nature of the yellow luminescenc[...]![]()
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García Tecedor, Miguel ; Prado Hurtado, Félix del ; Bueno, Carlos ; Vásquez, G. Cristian ; Bartolomé Vílchez, Javier ; Maestre Varea, David ; Díaz, Tomás ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Materials Science (AIMS) | 2016Microtubes and rods with nanopipes of transparent conductive oxides (TCO), such as SnO_2, TiO_2, ZnO and In_2O_3, have been fabricated following a vapor-solid method which avoids the use of catalyst or templates. The morphology of the as-grown t[...]![]()
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Bartolomé Vílchez, Javier ; Maestre Varea, David ; Amati, Mateo ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Springer | 2013-09-27Indium-zinc oxide nanostructures, such as nanosheets, nanobelts, and wires formed by oriented stacks of nanoplates have been grown by a controlled thermal evaporation method without the use of a foreign catalyst. Surface features in the stacked [...]![]()
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The capabilities of SEAM in uniformity assessment of SI GaAs are investigated. Profiles of SEAM signals across the wafer and SEAM images of dislocation distribution are obtained. Part of the nonlinear signal shows a profile that is not related t[...]![]()
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Nogales Díaz, Emilio ; Garcia, J. A. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Lorenz, K. ; Alves, E. | IOP publishing ltd | 2008-03-20The luminescence properties of Er doped ?-Ga_2O_3 and of the erbium gallium garnet Er_3 Ga_5O_12(ErGG) have been investigated both in the visible and in the infrared (IR) ranges by means of photoluminescence (PL). Doping of the ?-Ga_2O_3 was obt[...]![]()
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Nogales Díaz, Emilio ; Montone, A. ; Cardellin, F. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2002-12There. has been interest in the past years in the visible luminescence properties of germanium nanocrystals. Most of the previous works refer to Ge nanocrystals embedded in an oxide matrix. In this work nanocrystalline germanium has been prepare[...]![]()
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Borini, S. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | American Institute of Physics | 2003-12-15The luminescence of mechanically milled GaSb has been investigated by means of cathodoluminescence (CL) in the scanning electron microscope. Transmission electron microscopy reveals that the GaSb powders obtained after the milling process contai[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2008-01-23Erbium doped ß-Ga_2O_3 nanowires and microwires have been obtained by a vapour-solid process from an initial mixture of ß-Ga_2O_3 and Er_2O_3 powders. X-ray diffraction (XRD) analysis reveals the presence of erbium gallium garnet as well as ß-Ga[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R ; Coraci, A. ; Garcia, J. A. | IOP publishing ltd | 2002Visible luminescence from erbium oxide layers grown on crystalline and amorphous silicon (c-Si and a-Si) has been investigated. The results show strong red and green cathodoluminescence bands due to intraionic Er3+ radiative transitions at room [...]![]()
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Ortega Villafuerte, Yanicet ; Dieker, Ch ; Jaeger, W. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma | IOP publishing ltd | 2010-06-04ZnO nanorods containing different hollow structures have been grown by a thermal evaporation-deposition method with a mixture of ZnS and SnO(2) powders as precursor. Transmission electron microscopy shows rods with rows of voids as well as rods [...]![]()
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Méndez Martín, Bianchi ; Cebriano Ramírez, Teresa ; López, I. ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier | Spie-Int Soc Optical Engineering | 2013Interest on the control of light at the nano- and microscale has increased in the last years because of the incorporation of nanostructures into optical devices. In particular, semiconductor oxides microstructures emerge as important active mate[...]![]()
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Khomenkova, L. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2007-04ZnO microspheres, with surfaces covered with nanowalls, as well as nano- and microrods, have been grown by thermal treatment of ZnS powder. The structures have been grown at temperatures in the range of 750-900 ºC in a catalyst-free process. Pre[...]