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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Alvarez, Rafael; García Valenzuela, Aurelio; López Santos, Carmen; Ferrer, Francisco; +6 Authors

    Target poisoning in reactive magnetron sputtering deposition of thin films is an undesired phenomenon, well known for causing a drastic fall of the process efficiency. We demonstrate that when this technique is operated at oblique angles, films with composition raging from pure metallic to stoichiometric compound can be grown in non-poisoned conditions, thus avoiding most of the associated drawbacks. We have employed amorphous TiOx, although the presented results can be easily extrapolated to other materials and conditions. It is found that the proposed method improves 400% the growth rate of TiO2 thin films. Ministerio de Economía y Competitividad 201560E055 (MINECO-CSIC) Ministerio de Economía y Competitividad MAT2013-42900-P Ministerio de Economía y Competitividad MAT2013-40852-R Junta de Andalucía P12-FQM-2265

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ idUS. Depósito de In...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Gil-Rostra, J.; García-García, Francisco J.; Ferrer, F. J.; González-Elipe, Agustín R.; +1 Authors

    Several mixed oxide thin film series of samples (Si¿Co¿O, Si¿Ni¿O, Si¿W¿O) have been prepared by reactive magnetron sputtering at oblique angle geometries. The paper focuses on the description of microstructure of the films as a function of their stoichiometry. It is found that for identical process parameters (gas mixture, pressure, magnetron-substrate distance, incidence angle of the vapour flux, etc.) the tilt angle of the developed columnar microstructure and the film porosity is strongly dependent on the stoichiometry of the films. The results are discussed in the framework of several theoretical models on this topic. The authors thank Junta de Andalucia (Projects TEP8067, and FQM-2265) and Ministry of Science and Innovation (Projects MAT2013-42900-P, and MAT2013-40852-R) for financial support. Peer Reviewed

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    Thin Solid Films
    Article . 2015 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Recolector de Cienci...arrow_drop_down
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      Thin Solid Films
      Article . 2015 . Peer-reviewed
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    Authors: Gil-Rostra, J.; Ferrer, F. J.; Martín, Inocencio R.; González-Elipe, Agustín R.; +1 Authors

    This paper reports the luminescent behavior of Eu:ZnO thin films prepared by an one-step procedure that combines reactive magnetron sputtering deposition of ZnO with the plasma activated decomposition of a non-volatile acetylacetonate precursor of Eu sublimated in an effusion cell. Chemical composition and microstructure of the Eu:ZnO thin films have been characterized by several methods and their photo-, cathode- and ion-luminescent properties studied as a function of Eu concentration. The high transparency and well controlled optical properties of the films have demonstrated to be ideal for the development of cathode- and ion- luminescence sensors. The authors thank the Junta de Andalucía (projects FQM-6900, TEP-8067 and FQM-2265) and the MINECO (Projects CONSOLIDER CSD2008-00023, MAT2013-40852-R and MAT2013-42900-P) for financial support. Peer Reviewed

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    Journal of Luminescence
    Article . 2016 . Peer-reviewed
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      Journal of Luminescence
      Article . 2016 . Peer-reviewed
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    Authors: Salazar, P.; Rico, Víctor J.; González-Elipe, Agustín R.;

    This work presents a novel bilayer Ni/Cu porous nanostructured film electrode prepared by physical vapor deposition (PVD) in an oblique angle configuration. Scanning electron microscopy (SEM) data revealed that the film, with an approximate thickness of 200 nm, is formed by tilted nanocolumns of around 50 nm of diameter and an inclination of 30° with respect to the surface normal. X ray photoelectron spectroscopy (XPS) data confirmed a bilayer configuration with Cu and Ni located at the top and bottom parts of the film, respectively. A porosity of ca. 45-35% as determined by Rutherford back scattering (RBS) offered a large exposed area and excellent diffusion properties that, combined with a very good catalytic activity, rendered these films excellent electrodes for the quantitative determination of glucose. Under optimized working conditions of detection these electrodes presented a high sensitivity of 2.53 A M cm (R: 0.999), a limit of detection of 0.23 μM and a time response of ca. 2 s. The sensors did not show any loss of response during a period of 4 months. The selectivity of the sensor was checked against various interferences, including physiological compounds, different sugars and ethanol, in all cases with excellent results. The feasibility of using of this sensor for practical applications was confirmed by successfully determining the glucose content in different commercial beverages. The funds for the development of the present work have been provided by the MINECO and the “Fondo social Europeo”, (project RECUPERA 2020) and projects MAT2013-40852-R and MAT2013-42900-P from MINECO and TEP 8067 and FQM 6900 from the Junta de Andalucía. MINECO/ICTI2013-2016/MAT2013-42900-P

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    Sensors and Actuators B Chemical
    Article . 2016 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Recolector de Cienci...arrow_drop_down
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      Sensors and Actuators B Chemical
      Article . 2016 . Peer-reviewed
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    Authors: Oulad Zian, Youssef; Sánchez Valencia, Juan Ramón; Oliva Ramirez, Manuel; Parra Barranco, Julián; +8 Authors

    A wide-range in situ tunable 1D Bragg microcavity including a hybrid layer as white light emitter defect is shown by J. R. Sanchez-Valencia, A. Borras, and co-workers on page 1124. White emission is obtained by Förster resonance energy transfer between blue (1,3,5-triphenyl-2-pyrazoline) and orange (rubrene) dyes homogeneously infiltrated within the host nanocolumnar SiO2 film, which is formed by glancing angle deposition. Sequential physical vapor deposition at low temperatures provides the organic dyes localization within the porous nanostructure of the defect layer. Junta de Andalucía TEP8067 FQM-6900 P12-FQM-2265 España Mineco MAT2013-40852-R MAT2013-42900-P

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    Authors: Lahoz, Ruth; Espinós, J.P.; Yubero, Francisco; González-Elipe, Agustín R.; +1 Authors

    This work studies the nitridation of Ta by laser irradiation by means of x-ray photoelectron spectroscopy. The study has been carried out under in situ conditions by controlling the nitrogen partial pressure, the presence of traces of oxygen, and the irradiance of the laser. It is found that a thin layer of Ta2O5 is directly obtained when irradiating in the presence of oxygen, while a Ta3N5 surface compound and some minor contributions of nonstoichiometric phases are formed in the presence of nitrogen. For O2:N2 mixtures at 0.1 Pa, preferential nitride formation occurs up to a ratio of 1:4, while Ta2O5 starts to be predominant for ratios above this value. The air stability of the tantalum nitride layer formed by laser irradiation and the surface topography of the irradiated metal are also studied. The possible factors determining this behavior are discussed. Authors thank the European Union (Project CERAMGLASS, Life-ENV/ES/560), the Spanish Ministry of Science and Innovation (Projects CONSOLIDER CSD2008-00023, MAT2013-42900-P and MAT2013-40852-R), the “Junta de Andalucía” (Projects TEP8067, FQM-6900 and FQM-2265) and the “Diputación General de Aragón” (Research Group T87) for financial support. Peer Reviewed

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    Journal of Materials Research
    Article . 2015 . Peer-reviewed
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      Journal of Materials Research
      Article . 2015 . Peer-reviewed
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    Authors: Rafael Alvarez; Aurelio García-Valenzuela; Carmen López-Santos; Francisco J. Ferrer; +6 Authors

    Target poisoning in reactive magnetron sputtering deposition of thin films is an undesired phenomenon, well known for causing a drastic fall of the process efficiency. We demonstrate that when this technique is operated at oblique angles, films with composition raging from pure metallic to stoichiometric compound can be grown in non-poisoned conditions, thus avoiding most of the associated drawbacks. We have employed amorphous TiOx, although the presented results can be easily extrapolated to other materials and conditions. It is found that the proposed method improves 400% the growth rate of TiO2 thin films. The authors thank the Junta de Andalucía (P12-FQM-2265) and the Spanish Ministry of Economy and Competitiveness (Projects MAT2013-42900-P, MAT2013-40852-R, MINECO-CSIC 201560E055) for financial support.

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    Plasma Processes and Polymers
    Article . 2016 . Peer-reviewed
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      Plasma Processes and Polymers
      Article . 2016 . Peer-reviewed
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    Authors: Rafael Alvarez; Carmen López-Santos; Francisco J. Ferrer; Víctor J. Rico; +3 Authors

    The growth of nanoporous layers by plasma-assisted deposition techniques is strongly mediated by the ion fluxes in the reactor. To analyze their influence we have deposited different nanostructured thin films by the magnetron sputtering technique at oblique angles, modulating the ion fluxes in the plasma by tuning the frequency of the electromagnetic signal from pure DC to 160 kHz DC pulsed mode. In the DC case, ions possess energies below 5 eV and do not induce noticeable changes in the film structure. However, when the signal is pulsed, ions with energies up to 40 eV impinge on the film, decreasing the porosity of the layers and tilting down the porous/nanocolumnar structures. As a result, we demonstrate that the overall porosity of the layers and the tilt angle of the columns can be tailored as two independent morphological quantities. The authors thank the Junta de Andalucía (P12-FQM-2265 and P10-FQM-6900) and the Ministry of Science and Innovation (Projects CONSOLIDER CSD2008-00023, MAT2013-42900-P, MAT2013-40852-R) for financial support. Peer Reviewed

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    Plasma Processes and Polymers
    Article . 2015 . Peer-reviewed
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      Plasma Processes and Polymers
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    Authors: García-García, Francisco J.; Salazar, Pedro; Yubero, Francisco; González-Elipe, Agustín R.;

    Porous nanostructured NiO thin films have been prepared in one step by magnetron sputtering in an oblique angle configuration (MS-OAD) and used as electrodes for the non-enzymatic detection of glucose. The films have been thoroughly characterized by different complementary techniques and their performance for the analysis of glucose in basic solutions determined by electrochemical methods. These electrodes presented four times higher sensitivity that equivalent compact thin films prepared by MS in a normal configuration and were superior in terms of sensitivity than majority of nickel based electrodes prepared by other methods. Finally, a high sensitivity towards detection of glucose in blood, insensitivity to common interferences, a long term stability and high reproducibility confirmed the good performance and reliability of these electrodes for practical analytical purposes. The funds for the development of the present work have been provided by the MINECO (projects RECUPERA 2020 together with the “Fondo social Europeo”, MAT2013-40852-R and MAT2013-42900-P) and the Junta de Andalucía (TEP 8067 and FQM 6900).

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    Electrochimica Acta
    Article . 2016 . Peer-reviewed
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      Electrochimica Acta
      Article . 2016 . Peer-reviewed
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    Authors: Rico, Víctor J.; López-Gascón, Clarisa; Espinós, J.P.; Lahoz, Ruth; +3 Authors

    This work describes an in-situ Nd:YAG laser-assisted coating method to modify industrial glazed ceramic surfaces. The method makes use of a Cu polymer coordination complex, transformed via 1064 nm continuos wave (cw) laser irradiation, into a lustre-type glassy coating covering the ceramic substrate. The obtained coatings, with typical thicknesses ranging between 4 and 14 μm, become integrated onto the ceramic glaze via a sharp interface, as found by SEM observation. Diffuse Reflectance UV-vis spectroscopy shows that the lustre effect arises from surface plasmon resonant effects associated to the formation of nanometric size Cu particles dispersed throughout the glaze coating. This was confirmed by XPS analysis and other techniques showing that the laser decomposition treatment induces the redox transformation of the Cu (II) complexes, present in the original precursor, into reduced Cu (0) nanoparticles. Financial support from the EU (LIFE11/ENV/ES560), Innovaragón (ITA-DGA/ES 1368), DGA (Group T87), and projects MAT2013-40852-R and MAT2013- 42900-P from MINECO and TEP 8067 and FQM 6900 from the Junta de Andalucía is greatfully acknowledged. Peer Reviewed

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    Journal of the European Ceramic Society
    Article . 2016 . Peer-reviewed
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      Journal of the European Ceramic Society
      Article . 2016 . Peer-reviewed
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    Authors: Alvarez, Rafael; García Valenzuela, Aurelio; López Santos, Carmen; Ferrer, Francisco; +6 Authors

    Target poisoning in reactive magnetron sputtering deposition of thin films is an undesired phenomenon, well known for causing a drastic fall of the process efficiency. We demonstrate that when this technique is operated at oblique angles, films with composition raging from pure metallic to stoichiometric compound can be grown in non-poisoned conditions, thus avoiding most of the associated drawbacks. We have employed amorphous TiOx, although the presented results can be easily extrapolated to other materials and conditions. It is found that the proposed method improves 400% the growth rate of TiO2 thin films. Ministerio de Economía y Competitividad 201560E055 (MINECO-CSIC) Ministerio de Economía y Competitividad MAT2013-42900-P Ministerio de Economía y Competitividad MAT2013-40852-R Junta de Andalucía P12-FQM-2265

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    Authors: Gil-Rostra, J.; García-García, Francisco J.; Ferrer, F. J.; González-Elipe, Agustín R.; +1 Authors

    Several mixed oxide thin film series of samples (Si¿Co¿O, Si¿Ni¿O, Si¿W¿O) have been prepared by reactive magnetron sputtering at oblique angle geometries. The paper focuses on the description of microstructure of the films as a function of their stoichiometry. It is found that for identical process parameters (gas mixture, pressure, magnetron-substrate distance, incidence angle of the vapour flux, etc.) the tilt angle of the developed columnar microstructure and the film porosity is strongly dependent on the stoichiometry of the films. The results are discussed in the framework of several theoretical models on this topic. The authors thank Junta de Andalucia (Projects TEP8067, and FQM-2265) and Ministry of Science and Innovation (Projects MAT2013-42900-P, and MAT2013-40852-R) for financial support. Peer Reviewed

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    Thin Solid Films
    Article . 2015 . Peer-reviewed
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      Thin Solid Films
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    Authors: Gil-Rostra, J.; Ferrer, F. J.; Martín, Inocencio R.; González-Elipe, Agustín R.; +1 Authors

    This paper reports the luminescent behavior of Eu:ZnO thin films prepared by an one-step procedure that combines reactive magnetron sputtering deposition of ZnO with the plasma activated decomposition of a non-volatile acetylacetonate precursor of Eu sublimated in an effusion cell. Chemical composition and microstructure of the Eu:ZnO thin films have been characterized by several methods and their photo-, cathode- and ion-luminescent properties studied as a function of Eu concentration. The high transparency and well controlled optical properties of the films have demonstrated to be ideal for the development of cathode- and ion- luminescence sensors. The authors thank the Junta de Andalucía (projects FQM-6900, TEP-8067 and FQM-2265) and the MINECO (Projects CONSOLIDER CSD2008-00023, MAT2013-40852-R and MAT2013-42900-P) for financial support. Peer Reviewed

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    Journal of Luminescence
    Article . 2016 . Peer-reviewed
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      Journal of Luminescence
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    Authors: Salazar, P.; Rico, Víctor J.; González-Elipe, Agustín R.;

    This work presents a novel bilayer Ni/Cu porous nanostructured film electrode prepared by physical vapor deposition (PVD) in an oblique angle configuration. Scanning electron microscopy (SEM) data revealed that the film, with an approximate thickness of 200 nm, is formed by tilted nanocolumns of around 50 nm of diameter and an inclination of 30° with respect to the surface normal. X ray photoelectron spectroscopy (XPS) data confirmed a bilayer configuration with Cu and Ni located at the top and bottom parts of the film, respectively. A porosity of ca. 45-35% as determined by Rutherford back scattering (RBS) offered a large exposed area and excellent diffusion properties that, combined with a very good catalytic activity, rendered these films excellent electrodes for the quantitative determination of glucose. Under optimized working conditions of detection these electrodes presented a high sensitivity of 2.53 A M cm (R: 0.999), a limit of detection of 0.23 μM and a time response of ca. 2 s. The sensors did not show any loss of response during a period of 4 months. The selectivity of the sensor was checked against various interferences, including physiological compounds, different sugars and ethanol, in all cases with excellent results. The feasibility of using of this sensor for practical applications was confirmed by successfully determining the glucose content in different commercial beverages. The funds for the development of the present work have been provided by the MINECO and the “Fondo social Europeo”, (project RECUPERA 2020) and projects MAT2013-40852-R and MAT2013-42900-P from MINECO and TEP 8067 and FQM 6900 from the Junta de Andalucía. MINECO/ICTI2013-2016/MAT2013-42900-P

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    Sensors and Actuators B Chemical
    Article . 2016 . Peer-reviewed
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      Sensors and Actuators B Chemical
      Article . 2016 . Peer-reviewed
      License: Elsevier TDM
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    Authors: Oulad Zian, Youssef; Sánchez Valencia, Juan Ramón; Oliva Ramirez, Manuel; Parra Barranco, Julián; +8 Authors

    A wide-range in situ tunable 1D Bragg microcavity including a hybrid layer as white light emitter defect is shown by J. R. Sanchez-Valencia, A. Borras, and co-workers on page 1124. White emission is obtained by Förster resonance energy transfer between blue (1,3,5-triphenyl-2-pyrazoline) and orange (rubrene) dyes homogeneously infiltrated within the host nanocolumnar SiO2 film, which is formed by glancing angle deposition. Sequential physical vapor deposition at low temperatures provides the organic dyes localization within the porous nanostructure of the defect layer. Junta de Andalucía TEP8067 FQM-6900 P12-FQM-2265 España Mineco MAT2013-40852-R MAT2013-42900-P

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