Información del autor
Autor Maestre Varea, David |
Documentos disponibles escritos por este autor (58)
texto impreso
Fernández Sánchez, Paloma ; López Orozco, José Antonio ; Maestre Varea, David ; Hidalgo Alcalde, Pedro ; Besada Portas, Eva ; Sotillo Buzarra, Belén ; Neira Gómez, Andrea Paulette ; Pereyra Ocampo, Laura Victoria ; de las Heras de la Campa, Pablo | 2016-04El juego como modo de aprendizaje es algo inherente no sólo al ser humano sino, en general, al reino animal. Para cualquier mamífero el juego constituye la forma de aprendizaje fundamental. A través del juego se aprende a luchar, a defenderse y [...]texto impreso
Cathodoluminescence (CL) and remote electron beam induced current (REBIC) in the scanning electron microscope (SEM) has been used to investigate the electron recombination mechanisms in tin oxide. Sintered material prepared from high purity powd[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-03Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the luminescence mechanisms in tin oxide. Sintered material prepared from high purity powder has been found to show a strong dependence of the CL emi[...]texto impreso
Cathodoluminescence study of semiconductor oxide micro- and nanostructures grown by vapor deposition
Piqueras de Noriega, Javier ; Maestre Varea, David ; Ortega Mallén, Yolanda ; Cremades Rodríguez, Ana Isabel ; Fernández Sánchez, Paloma | Wiley-Blackwell | 2008-07starting SnO_2, powder. In-rich nanoislands were found to grow on some edges of the tubes. ZnO nanostructures doped with Sri or Eu were grown by adding SnO_2 and Eu(2)O(3) powder, respectively, to the ZnO precursor powder. All the samples have b[...]texto impreso
Rezgui, B. Drid ; Gourbilleau, F. ; Maestre Varea, David ; Palais, O. ; Sibai, A. ; Lemiti, M. ; Bremond, G. | American Institute of Physics | 2012-07-15Experimental investigation of photoconductivity in Si-rich silicon oxide (SRSO)/SiO_2 multilayer (ML) structures prepared by magnetron reactive sputtering is reported. Photocurrent (PC) measurements show that the PC threshold increases with decr[...]texto impreso
Guzmán Navarro, G ; Herrera Zaldivar, M. ; Valenzuela Benavides, J. ; Maestre Varea, David | American Institute of Physics | 2011-07-01We report a cathodoluminescence (CL) study of ß-Ga_2O_3 nanowires grown by thermal evaporation of GaN on Si(100) and Au/Si(00) substrates. Condensation and subsequent oxidation of metallic Ga is suggested as the growth mechanism of ß-Ga_2O_3 nan[...]texto impreso
Prado, Félix del ; Andersen, Hanne Flaten ; Taeño González, María ; Mhlen, Jan Petter ; Ramírez Castellanos, Julio ; Maestre Varea, David ; Karazhanov, Smagul ; Cremades Rodríguez, Ana Isabel | Nature Publishing Group | 2020-03-26Transition metal oxides potentially present higher specific capacities than the current anodes based on carbon, providing an increasing energy density as compared to commercial Li-ion batteries. However, many parameters could influence the perfo[...]texto impreso
Maestre Varea, David ; Haeussler, D. ; Cremades Rodríguez, Ana Isabel ; Jaeger, W. ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-09-22Sn-doped In2O3 arrow-shaped nanorods have been grown by a catalyst-free evaporation deposition method. Transmission electron microscopy (TEM) investigations reveal a complex defect structure consisting of nanoprecipitates, dislocation loops, and[...]texto impreso
Bartolomé Vílchez, Javier ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Amatti, M. ; Piqueras de Noriega, Javier | Pergamon-Elsevier Science Ltd | 2013-04Microrods and hierarchical structures of indium-zinc-oxide (IZO) with different compositions were grown by thermal treatments of mixtures of InN and ZnO powders. In long rods, an increase in Zn content along the growth axis is revealed by energy[...]texto impreso
Cristian Vasquez, G. ; Andrea Peche-Herrero, M. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Ramirez-Castellanos, Julio ; Gonzalez-Calbet, José M. ; Piqueras de Noriega, Javier | RSC Royal Society of Chemistry | 2013Cr doped TiO_2 rutile nanoparticles have been used as precursor of microrods and microtubes grown by a vapor-solid method. The grown microstructures have nearly square cross-sections of a few microns wide and lengths of up to about 100 microns. [...]texto impreso
En la presente tesis doctoral se exponen y discuten los principales resultados extraídos de la investigación realizada sobre muestras de SnO2 y TiO2 sinterizado, o en forma de micro- y nanoestructuras alargadas. Ambos materiales se encuentran en[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2004-11Remote electron beam induced current (REBIC) and cathodoluminescence (CL) modes in the scanning electron microscope (SEM) have been used to investigate SnO2 sintered samples. The study of the electrically active boundaries present in the oxide s[...]texto impreso
Prado Hurtado, Félix del ; Taeño González, María ; Maestre Varea, David ; Ramírez Castellanos, Julio ; González Calbet, José María ; Cremades Rodríguez, Ana Isabel | Pergamon Elsevier Science | 2019-06Graphene oxide (GO) based composites functionalized with nanoparticles are emerging as potential candidates for multifunctional devices. As the synthesis route can strongly influence the way in which the nanoparticles are anchored to GO and the [...]texto impreso
Maestre Varea, David ; Plugaru, R ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Materials Research Society | 2003The luminescence of titanium oxide and tin oxide has been investigated by cathodoluminescence in the SEM, as a function of the structural changes induced by thermal treatments. The evolution of the luminescence of TiO2 rutile, anatase and mixtur[...]texto impreso
Rezgui, B. ; Sibai, A. ; Nychyporuk, T. ; Lemiti, M. ; Bremond, G. ; Maestre Varea, David ; Palais, O. | Amer Inst Physics | 2010-05-03The size of silicon quantum dots (Si QDs) embedded in silicon nitride (SiN(x)) has been controlled by varying the total pressure in the plasma-enhanced chemical vapor deposition (PECVD) reactor. This is evidenced by transmission electron microsc[...]texto impreso
Cristian Vasquez, G. ; Andrea Peche-Herrero, M. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Ramirez-Castellanos, Julio ; María Gonzalez-Calbe, José ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2013-01-31Rutile TiO_2 nanoparticles doped with V, Cr, or Mn ions have been synthesized via a modified Pechini method using polymeric precursors. The final particle sizes range between 20 and 500 nm depending on the selected dopant. The TiO_2 rutile phase[...]texto impreso
Moldarev, D. ; Taeño González, María ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Karazhanov, Smagul Zh ; Marstein, E. | Elsevier | 2020-05-08Due to the combination of low cost materials deposition and device fabrication methods as well as competitive efficiency compared to the other Si solar cell architectures, the hybrid organic-silicon solar cells have attracted attention of the sc[...]texto impreso
Taeño González, María ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel | Elsevier | 2020-06-25Complex patterning of surfaces commonly requires a significant effort in terms of time, cost, and advanced post-fabrication treatments design, which could be overcome by self-organization mechanisms avoiding damage to the surface materials and e[...]texto impreso
Solano, Ricardo A. ; Herrera, Adriana P. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel | Hindawi Ltd | 2019Anatase TiO_2 nanoparticles doped with iron ions have been synthesized via the green chemistry method using aqueous extract of lemongrass (Cymbopogon citratus) obtained from Soxhlet extraction and doped by wet impregnation. The TiO_2 anatase pha[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2006-03-28Samples of rutile TiO2 have been prepared by sintering compacted powders under argon flow. Long (above 20 h) sintering times at 1500 degrees C led to the formation of rods with squared cross-sections in a broad range of sizes. A two-step anneali[...]texto impreso
In this work we report on the growth of Fe_(1-x)Gax films by means of the electrodeposition technique in baths containing sodium citrate as an antioxidant agent. We have investigated the effect of the electrolyte composition in terms of its Ga c[...]texto impreso
Herrera, Manuel ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2013-05-02Undoped and Mn doped SnO_2 nanowires, nanobelts, and microplates have been grown by a thermal evaporation method that enables the morphology and the Mn content in the structures to be controlled. The structural and morphological characterization[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2005Micro- and nanotubes, and other elongated structures of SnO_2 as wires and rods, were grown after sintering in argon flow at temperatures ranging from 1350 degrees C to 1500 degrees C. The morphology and luminescence properties of these structur[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Gregoratti, Luca ; Piqueras de Noriega, Javier | Amer Scientific Publishers | 2008-12Titanium oxide nanowires have been grown by thermal treatment of pressed TiN powder under argon or N-2 flow. It has been found that two-step treatments at two different temperatures, 400 degrees C and 800 degrees C, lead to the growth of nanowir[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2005-02-15Sintering SnO_2 under argon flow at temperatures in the range of 1350-1500 degreesC causes the formation of wires, rods, and tubes on the sample surface. At high temperatures of the mentioned range, microwires with lengths of hundreds of microns[...]texto impreso
Herrero Domínguez, Santiago ; Martínez del Pozo, Álvaro ; Mancheño Real, María José ; Osío Barcina, José de Jesús ; Nacenta Torres, Pablo ; Bárcena Espelleta, Araceli ; Rubio Lago, Luis ; Álvarez Serrano, Inmaculada ; Cortés Gil, Raquel ; González Prieto, Rodrigo ; Torrecilla Manresa, Sofía ; Cilleros Prados, Olga ; Sobrino Díaz, María Lourdes ; Bartolomé Vílchez, Javier ; Cortijo Montes, Miguel ; Coloma Manjón-Cabeza, Isabel ; Catalán Torrecilla, Cristina ; Guerrero Martínez, Andrés ; Martínez Madrid, Carmen Belén ; Mártínez Ruiz, María Paloma ; Méndez Pozo, Gonzalo Rubén ; Priego Bermejo, José Luis ; Ranchal Sánchez, Rocío ; Maestre Varea, David ; Desvoyes, Benedicte ; Gutiérrez Franco, Yanna María ; Arribas Fernández, Paula ; Julián Cortés, Alvaro | 2020-07-01I.amAble ha ofrecido a estudiantes universitarios de física, química, veterinaria, biología y educación la oportunidad de complementar su formación mediante el diseño, la realización y la evaluación de talleres científicos que faciliten la inclu[...]texto impreso
Herrero Domínguez, Santiago ; Álvarez Serrano, Inmaculada ; Barba Fernández, Carmen ; Cilleros Prados, Olga ; Corrales Castellanos, María Eugenia ; Criado Portal, Antonio José ; Gómez Castro, Emilio ; Gómez de Salazar Caso de los Cobos, José María ; González Prieto, Rodrigo ; Guerrero Martínez, Andrés ; Hernández Díaz, María Yolanda ; Jiménez Aparicio, Reyes ; Lobato Fernández, Álvaro ; Mancheño Real, Mª José ; Mena Fernández, María Luz ; Martínez del Pozo, Álvaro ; Muñoz Olivas, Riansares ; Osío Barcina, José de Jesús ; Priego Bermejo, José Luis ; Rodríguez Vega, Sergio ; Sánchez Arroyo, Antonio José ; Sánchez Benítez, Javier ; Sobrino Díaz, Lourdes ; Taravillo Corralo, Mercedes ; Pastor Gil, Lorena ; Rubianes Méndez, Miguel Alejandro ; Maestre Varea, David ; Ranchal Sánchez, Rocío ; Bautista Blasco, Susana ; Cárdenas Bonet, Marlon ; Gervás Gómez-Navarro, Pablo ; Méndez Pozo, Gonzalo ; Bárcena Espelleta, Araceli ; Desvoyes, Benedicte ; Fernández Rodríguez, Juan Miguel ; Gibaja Jiménez, Mariano ; Nacenta Torres, Pablo ; Rubio Lago, Luis | 2018-07-02En este proyecto de innovación se persigue enriquecer la formación de los estudiantes de las facultades de ciencias (F. CC.FF. y F. CC.QQ.) mediante una propuesta teórico-práctica basada en la metodología Aprendizaje-Servicio (ApS) y encaminada [...]texto impreso
Herrero Domínguez, Santiago ; Corrales Castellanos, María Eugenia ; Sobrino Díaz, María Lourdes ; Cilleros Prados, Olga ; Barba Fernández, Carmen ; Azor Lafarga, Alberto Eduardo ; Hernández Díaz, María Yolanda ; Martínez del Pozo, Álvaro ; Ranchal Sánchez, Rocío ; Maestre Varea, David ; Méndez Pozo, Gonzalo Rubén ; Gervás Gómez-Navarro, Pablo ; Pastor Gil, Lorena ; Taravillo Corralo, Mercedes ; Guerrero Martínez, Andrés ; Sánchez Benítez, Francisco Javier ; Martín Conde, María ; Priego Bermejo, José Luis ; González Prieto, Rodrigo ; Jiménez Aparicio, Reyes ; Álvarez Serrano, Inmaculada ; Cortés Gil, Raquel ; Osío Barcina, José de Jesús ; Mancheño Real, María José ; Arribas Fernández, Paula ; Lobato Fernández, Álvaro ; Sánchez Arroyo, Antonio José ; Torrecilla Manresa, Sofía ; Cárdenas Bonett, Marlón Félix ; Desvoyes, Benedicte ; Bárcena Espelleta, Araceli ; Nacenta Torres, Pablo ; Rubio Lago, Luis ; Bautista Blasco, Susana ; Julián Cortés, Alvaro ; Arancibia Llaneza, Julieta Noelia ; Lombraña Pascual, Rodrigo ; Catalán Torrecilla, Cristina ; Gutiérrez Franco, Yanna María ; Mártínez Ruiz, María Paloma | 2019-08-20I.amAble es un proyecto que nació con una filosofía centrada en la utilización de acciones de solidaridad como método de aprendizaje. Se diseñan y organizan talleres científicos inclusivos para realizarlos en parejas formadas por personas con di[...]texto impreso
Vázquez López, Antonio ; Yaseen, Anisa ; Maestre Varea, David ; Ramírez Castellanos, Julio ; Karazhanov, Smagul Zh ; Marstein, Erik S ; Cremades Rodríguez, Ana Isabel | Elsevier | 2020-07-15In this work, hybrid composites formed by PEDOT:PSS (poly(3,4-ethylene dioxythiophene):-polystyrene sulfonate) and anatase TiO_2 nanoparticles synthesized by hydrolysis were spin-coated on Si substrates in order to evaluate their potential imple[...]texto impreso
Bartolomé Vílchez, Javier ; Hidalgo Alcalde, Pedro ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2014-04-21Electric field induced mechanical resonances of In2O3 microrods are studied by in-situ measurements in the chamber of a scanning electron microscope. Young's moduli of rods with different cross-sectional shapes are calculated from the resonance [...]texto impreso
texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Gregorati, Luca ; Piqueras de Noriega, Javier | American Chemical Soc. | 2010-03-04Mixtures of InN and SnO2 powders, with it weight ratio of 10:1, have been used as precursors for the thermal growth of arrow-shaped and other elongated micro- and nanostructures of indium-tin oxide (ITO) containing about 2.6 atom % of Sit. The t[...]texto impreso
Bartolomé Vílchez, Javier ; Maestre Varea, David ; Amati, Mateo ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-04-28Micropyramids of zinc-doped indium oxide have been grown by thermal treatments of compacted InN and ZnO powders at temperatures between 700:and 900 degrees C Under argon flow. X-ray diffraction (XRD) measurements and energy-dispersive X-ray (EDS[...]texto impreso
Vázquez López, Antonio ; Maestre Varea, David ; Ramírez Castellanos, Julio ; González Calbet, José María ; Pís, Igor ; Nappini, Silvia ; Yuca, Neslihan ; Cremades Rodríguez, Ana Isabel | American Chemical Society | 2020-08-27Li-ion batteries (LiB) play nowadays a major role in several technological fields. In addition to enhanced high capacity and long cyclability, some other issues regarding safety, materials sustainability, and low cost remain unsolved. Tin oxide [...]texto impreso
Vásquez, G. Cristian ; Andrea Peche-Herrero, M. ; Maestre Varea, David ; Alemán Llorente, Belén ; Ramirez-Castellanos, Julio ; Cremades Rodríguez, Ana Isabel ; Gonzalez-Calbet, José M. ; Piqueras de Noriega, Javier | Royal Soc. Chemistry | 2014Anatase TiO_2 nanoparticles doped with Al or Fe have been synthesized via a modified Pechini method which allows to reach high control in size and composition. Microstructural analysis onfirms the good crystallinity of the doped anatase nanopar[...]texto impreso
García Tecedor, Miguel ; Bartolomé Vílchez, Javier ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Trampert, A. | Tsinghua university press | 2019-02Exploiting the synergy between microstructure, morphology and dimensions by suitable nanomaterial engineering, can effectively upgrade the physical properties and material performances. Li_2SnO_3 elongated nano-and microstructures in form of bel[...]texto impreso
Baratas Díaz, Luis Alfredo ; Becerra García, Nieves ; Rodríguez López, Blanca María ; Negro Alousque, Isabel ; Cuervo Calvo, Laura ; Rouanne, Laurence Louise Marcelle ; González González, Juán Jesús ; Maestre Varea, David ; García Norro, Juan José ; Ruiz Tendero, Germán ; Pala Paul, Jesús ; Ranchal Sánchez, Rocío ; Rovira Madrid, Rogelio ; Álvarez Serrano, Inmaculada ; Cipres Palacín, María Ángeles ; Reol Merino, Milagros ; García Leal, María del Carmen | Universidad Complutense | 2018-02-21texto impreso
Calvo de Pablo, Pilar ; Baratas Díaz, Alfredo ; Alcolea Moratilla, Miguel Ángel ; Álvarez Serrano, Inmaculada ; Arroyo Ilera, Fernando ; Alonso Rodríguez, Francisco Javier ; Barrutia Solórzano, Victoria ; Bobkina, Jelena ; Botella Juan, Guillermo ; Caballero Armenta, Manuela ; Carrascal Andrade, Francisco Javier ; Ciprés Palacín, Ángeles ; Cuervo Calvo, Laura ; Díaz García, Elena ; Domingo Moratalla, Tomás ; Domínguez Romero, Elena ; Dosch, Sarah ; Fernández Sánchez, Paloma ; Font, Javier ; Gago García, María Lourdes ; García Leal, Carmen ; García Norro, Juan José ; Gómez Ruiz, María Luisa ; García Parejo, Isabel ; González, Juan Carlos ; Guzmán, Ana ; Hilario Silva, Pedro ; Huertas Bartolomé, Tebelia ; Lázaro y Torres, María Luisa ; López Molina, Antonio M. ; López Núñez, María Inmaculada ; Maestre Varea, David ; Magaña Ramos, Marina ; Merino Sánchez, Alejandro ; Muñoz Muñoz, Alberto ; Muñoz-Alonso, Gemma ; Negro Alousque, Isabel ; Nieves, Susana ; Palá-Paul, Jesús ; Plangger, Lea ; Ramírez Rico, Elena ; Rachal Sánchez, Rocío ; Rodríguez López, Blanca ; Rouanne, Laurence Louise Marcelle ; Rovira Madrid, Rogelio ; Ruiz Sánchez, María Beatriz ; Ruiz Tendero, Germán ; Sánchez Rivera, Jesús Ángel ; Santos Olmos, Leticia de ; Sanz Cabrerizo, Amelia ; Sanz Pineda, Concepción ; Sotelo Pérez, María ; Torrents Margalef, Jorge ; Vilar Carneiro, Argentina ; Zabala Vázquez, Jon | Editorial Santillana | 2016Una guía de espacios e instituciones para actividades educativas complementarias en enseñanza secundaria y Formación Profesional.texto impreso
Maestre Varea, David ; Martínez Velasco, I. ; Cremades Rodríguez, Ana Isabel ; Amati, M. ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2010-07-15Mn-doped In(2)O(3) nanopyramids have been grown by a catalyst-free thermal process at 700 degrees C using InN and Mn(2)O(3) powders as precursors. Energy dispersive spectroscopy, as well as X-ray photoelectron spectroscopy, demonstrate the prese[...]texto impreso
Maestre Varea, David ; Haeussler, Dietrich ; Cremades Rodríguez, Ana Isabel ; Jaeger, Wolfgang ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-04In_2O_3 nanorods have been grown by a catalyst free evaporation-deposition method. Transmission electron microscopy (TEM) investigations reveal that the rods contain tubular cavities, herein referred to as "nanopipes", along the total length of [...]texto impreso
Díaz García, Elena ; Cabrera Granado, Eduardo ; Gómez Calderón, Óscar ; Maestre Varea, David ; Domínguez-Adame Acosta, Francisco | 2016-01En este trabajo presentamos diferentes entornos online de gran utilidad para el proceso enseñanza-aprendizaje y la autoevaluación o evaluación automática de competencias científicas en el cálculo numérico a nivel universitario. Destacamos las ve[...]texto impreso
Vásquez, G. C. ; Karazhanov, S. Zh. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Foss, S. E. | American Physical Society | 2016-11-23The effects of doubly ionized oxygen vacancies [(V_O)ˆ(2+)]on the electronic structure and charge distribution in rutile TiO_2 are studied by combining first-principles calculations based on density functional theory and experimental results fro[...]texto impreso
Montero, J. ; Martinsen, F. A. ; García Tecedor, M. ; Karazhanov, S Zh. ; Maestre Varea, David ; Hauback, B. ; Marstein, E. S. | American Physical Society | 2017-05-08Oxygen-containing yttrium hydride thin films exhibit photochromic behavior: Transparent thin films reversibly switch from a transparent state to a photodarkened state after being illuminated with UV or blue light. From optical spectrophotometry [...]texto impreso
Gourbilleau, F. ; Ternon, C. ; Maestre Varea, David ; Palais, O. ; Dufour, C. | American Institute of Physics | 2009-07-01Si-rich-SiO_2(SRSO)/SiO_2 multilayers (MLs) have been grown by reactive magnetron sputtering. The presence of silicon nanoclusters (Si-ncls) within the SRSO sublayer and annealing temperature influence optical absorption as well as photoluminesc[...]texto impreso
Vásquez Villanueva, Geraldo Cristian ; Bathen, M.E. ; Galeckas, A. ; Bazioti, C. ; Johansen, K. M ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Prytz, O. ; Moe, A.M. ; Kuznetsov, A. Yu ; otros, ... | American Chemical Society | 2020-12-09Single-photon emitting point defects in semiconductors have emerged as strong candidates for future quantum technology devices. In the present work, we exploit crystalline particles to investigate relevant defect localizations, emission shifting[...]texto impreso
Maestre Varea, David ; Palais, O. ; Barakel, D. ; Pasquinelli, M. ; Alfonso, B. ; Gourbilleau, F. ; De Laurentis, M. ; Irace, A. | American Institute of Physics | 2010-03-15SiO_2 multilayers with embedded Si nanocrystals (Si-ncs) were investigated as an approach for developing highly efficient all Si tandem solar cells. The nanostructured samples, fabricated by means of a reactive magnetron sputtering, were structu[...]texto impreso
Maestre Varea, David ; Ramírez Castellanos, Julio ; Hidalgo Alcalde, Pedro ; Cremades Rodríguez, Ana Isabel ; Gónzalez Calbet, J.M. ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2007-04The defect structure of sintered SnO_2 was investigated by high-resolution transmission electron microscopy (HRTEM), cathodoluminescence (CL), and electrical measurements. HRTEM shows the presence of the SnO phase in the sintered samples as well[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science B.V. | 2009-02-01A study of the variation of structural and optical properties of different SnO2 micro- and nanostructures grown by thermal treatments including a post-growth annealing under argon flow has been carried out. The samples have been characterized by[...]texto impreso
Electrical properties of undoped and Mn doped SnO2 microplates and rods are studied by electron beam induced current (EBIC) in a scanning electron microscope (SEM), and I-V curves acquired at room temperature. AFM measurements reveal the formati[...]texto impreso
Vázquez López, Antonio ; Yaseen, Anisa ; Maestre Varea, David ; Ramírez Castellanos, Julio ; Marstein, Erik S ; Karazhanov, Smagul Zh ; Cremades Rodríguez, Ana Isabel | MDPI | 2020-02-06In this work, layered hybrid composites formed by tin oxide (SnO) nanoparticles synthesized by hydrolysis and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) have been analyzed. Prior to the composite study, both SnO and PEDO[...]texto impreso
Maestre Varea, David ; Hernandez, Elena ; Cremades Rodríguez, Ana Isabel ; Matteo, Amati ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2012-05Microtubes of Er-doped SnO2, as well as nanorods and nanoparticles, have been fabricated by a thermal evaporation deposition method at temperatures between 1400 and 1500 degrees C, by using a pellet of compacted SnO2 and Er2O3 powder mixture as [...]texto impreso
Bartolomé Vílchez, Javier ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel | Wiley?VCH Verlag GmbH | 2018Indium sulfide (In_2S_3) is a promising candidate for the replacement of CdS buffer layers in solar cell devices, while hexaindium heptasulfide (In_6S_7) presents interesting properties for its use as absorber material. In this work the fabricat[...]texto impreso
Peche Herrero, M. A. ; Maestre Varea, David ; Ramirez Castellanos, J. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Gonzalez Calvet, J. M. | RSC Royal Society of Chemistry | 2014SnO_2 nanoparticles doped with transition metals (V, Cr, Mn) have been synthesized by both the hydrothermal method (HDT) in a basic media and the liquid mixed method (LQM) based on the Pechini method. Nanocrystalline particles obtained via a liq[...]texto impreso
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[...]texto impreso
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[...]texto impreso
García Tecedor, Miguel ; Prado Hurtado, Félix del ; Torres Padilla, Dorcas I. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel | Wiley VCH | 2018-10-10Tin oxide low dimensional structures increasingly attract attention due to their wide application area. Indeed, by attaining new morphologies and properties the potential applications might increase the device portfolio. Furthermore, an adequate[...]texto impreso
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 [...]texto impreso
Vásquez, G. C. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Ramírez Castellanos, Julio ; Magnano, Elena ; Nappini, Silvia ; Karazhanov, Smagul Zh. | Nature Publishing Group | 2018-05-07The effects of Cr on local environment and electronic structure of rutile TiO? are studied combining theoretical and experimental approaches. Neutral and negatively charged substitutional Cr impurities Cr_(Ti)(0)* and Cr_(Ti)(-1)* as well as Cr[...]