Exploració per tema "Macroporous silicon"

Ara es mostren els items 1-20 de 24

    • A million-channel CO-PrOx microreactor on a fingertip for fuel cell application 

      Llorca Piqué, Jordi; Rosell, O.; Divins, N.J.; López, E.; Roig Costa, Maria; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; González de Rivera, F.; Rodríguez, L.I.; Seco, M. (2010)
      Article
      Accés restringit per política de l'editorial
      A silicon micromonolith containing ca.40000 regular channels of 3.3 μm in diameter per square millimeter has been successfully functionalized with anAu/TiO2 catalyst for CO preferential oxidation(CO-PrOx) in the presence ...

    • Absorption mechanisms in macroporous silicon photonic crystals 

      Segura García, Daniel; Cardador Maza, David; Rodríguez Martínez, Ángel; Llorca Piqué, Jordi (Elsevier, 2019-01-01)
      Article
      Accés obert
      We investigate the large differences classically found in literature between theoretical and empirical results in the optical characterization of macroporous silicon photonic crystals. Mainly, we study the impact of two ...

    • Bandgap widening in macroporous silicon photonic crystals by multiperiodic structures 

      Segura García, Daniel; Cardador Maza, David; Vega d'Aurelio, Davide; Santos Blanco, M. Concepción; Dios Otín, Víctor Federico; Rodríguez Martínez, Ángel (Institute of Physics (IOP), 2018-05-14)
      Article
      Accés obert
      Large bandgaps with low transmission in 3D macroporous silicon photonic crystals have been proved as an interesting technology for the development of optical filters and spectroscopic MIR gas sensors. The aim of this study ...

    • Characterization of 2D macroporous silicon photonic crystals: improving the photonic band identification in angular-dependent reflection spectroscopy in the mid-IR 

      Král, Z; Ferré Burrull, José; Pallarès Marzal, Josep; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Marsal, L F (2008-02)
      Article
      Accés restringit per política de l'editorial
      We report the experimental characterization of two-dimensional (2D) macroporous silicon photonic crystals using angular-dependent reflectance spectroscopy in the mid-IR region. We have investigated different sample structures ...

    • Compact device for CO2 optical sensign using macroporous silicon photonic crystals 

      Vega, Didac; Rodríguez Martínez, Ángel; Calavia, Raül; Vilanova, Xavier; Todorov Trifonov, Trifon (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A photonic crystal based on a macroporous silicon structure has been fabricated and successfully used for the detection of carbon dioxide. In this paper, the device and the measurement results are presented. The sensing ...

    • Enhanced geometries of macroporous silicon photonic crystals for optical gas sensing applications 

      Cardador Maza, David; Vega d'Aurelio, Davide; Segura García, Daniel; Todorov Trifonov, Trifon; Rodriguez, Albert (2017-07-01)
      Article
      Accés obert
      A macroporous silicon photonic crystal is designed and optimized theoretically for its use in gas sensing applications and IR optical filters. Light impinges perpendicularly onto the sample surface (vertical propagation) ...

    • Fabrication of photonic crystals based on macroporous silicon for thermal emission in mid infra-red 

      Deriziotis, Ioannis Romanos (Universitat Politècnica de Catalunya, 2017-10)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Photonic crystals (PhC) have a unique band structure that opens up a lot of possibilities in terms of manipulating electromagnetic waves. Lately a lot of research has been done in possible applications of photonic crystals ...

    • Fabrication of silicon oxide microneedles from macroporous silicon 

      Rodríguez Martínez, Ángel; Molinero, D; Valera Cano, Enrique Andrés; Todorov Trifonov, Trifon; Marsal, L F; Pallarès Marzal, Josep; Alcubilla González, Ramón (2005-04)
      Article
      Accés restringit per política de l'editorial
      This paper presents a novel technique for silicon dioxide (SiO2) microneedle fabrication. Microneedles are hollow microcapillaries with tip diameters in the range of micrometers. They can be used in the fabrication of ...

    • First use of macroporous silicon loaded with catalyst film for a chemical reaction: a microreformer for producing hydrogen from ethanol steam reforming 

      Llorca Piqué, Jordi; Casanovas Grau, Albert; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón (2008-04-25)
      Article
      Accés restringit per política de l'editorial
      Macroporous silicon with millions of parallel microchannels per square centimeter can be used as a micromonolithic support for high-speed catalysis in miniaturized systems, opening a new and exciting field of research and ...

    • High yield hydrogen production enabled by macroporous silicon monoliths 

      Vega Bru, Didac; Jiménez Divins, Nuria; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Llorca Piqué, Jordi (Phantoms Foundation, 2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A macroporous silicon (MPS) membrane of 210 µm thickness was functionalized and evaluated for hydrogen production by steam reforming of various fuels. Performance is comparable to conventional reactors, but in a much ...

    • Infrared optical filters based in macroporous silicon for espectroscopic gas detection 

      Cardador Maza, David (Universitat Politècnica de Catalunya, 2019-12-19)
      Tesi
      Accés obert
      Gas detection is of great importance in areas as diverse as industry, health or safety in domestic environments or public spaces, among others, and it is highly specific to each application. The detection method depends ...

    • Infrared thermal emission inmacroporous silicon three-dimensional photonics crystals 

      Garin Escriva, Moises; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón (American Institute of Physics, 2007-07-30)
      Article
      Accés restringit per política de l'editorial
      In this paper we investigate the infrared thermal emission properties of macroporous silicon with modulated pore diameter. Samples with different pore modulation periodicities but fixed in-plane lattice constant are ...

    • Macroporous silicon coated with M/TiO2 (M=Au,Pt) as a highly efficient photoreactor for hydrogen production 

      Serafin, Jaroslaw; Soler Turu, Lluís; Vega Bru, Didac; Rodríguez Martínez, Ángel; Llorca Piqué, Jordi (2020-03-07)
      Article
      Accés obert
      Macroporous silicon disks containing ordered channels of 2 µm side and 0.2 mm length (9 × 106 channels cm-2) have been functionalized with a thin layer of Au/TiO2 and Pt/TiO2 photocatalysts and tested in the photoproduction ...

    • Macroporous silicon for gas detection 

      Vega Bru, Didac; Rodríguez Martínez, Ángel (2018-11-14)
      Capítol de llibre
      Accés obert
      Macroporous silicon (MPS) has been shown to be a promising material in many areas of technical interest. In particular, MPS has been applied for electronic devices and microfluidic applications. One of the most promising ...

    • Macroporous silicon for high-capacitance devices using metal electrodes 

      Vega Bru, Didac; Reina Marsinyach, Jordi; Martin, Ferran; Pavón Urbano, Ramón; Rodríguez Martínez, Ángel (2014-09-05)
      Article
      Accés obert
      In this paper, high-capacity energy storage devices based on macroporous silicon are demonstrated. Small footprint devices with large specific capacitances up to 100 nF/mm(2), and an absolute capacitance above 15 mu F, ...

    • Macroporous silicon for spectroscopic CO2 detection 

      Vega, Didac; Marti Alcaire, Ferran; Rodríguez Martínez, Ángel; Todorov Trifonov, Trifon (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A carbon dioxide sensor based on a photonic crystal of macroporous silicon and measurements of its response are presented in this paper. Photonic crystals have opened new ways for the miniaturization of optical detector ...

    • Macroporous silicon membranes for hydrogen production from multiple fuel sources 

      Vega Bru, Didac; Jiménez Divins, Nuria; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Llorca Piqué, Jordi (Universitat de València, 2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A macroporous silicon (MPS) membrane of 210 ¿m thickness was functionalized and evaluated for hydrogen production by steam reforming of various fuels. The MPS membrane was a regular array of pores about 3.3 ¿m diameter and ...

    • Macroporous silicon micro-nano structures for direct conversion of energy from light into chemical energy 

      Berenguel Costa, Guillem (Universitat Politècnica de Catalunya, 2021-07-05)
      Treball Final de Grau
      Accés restringit per decisió de l'autor

    • Macroporous silicon structures in 700 nm and 500 nm 

      Rodríguez Martínez, Ángel; Vega Bru, Didac; Llorca Piqué, Jordi (Editora ARTEMIS, 2023)
      Capítol de llibre
      Accés obert
      Macroporous Silicon is a structured material with which innovative optical and electrical characteristics can be obtained. It consists in a crystalline silicon slab where tubular perforations are made. Several fabrication ...

    • Macroporous silicon. Technology and applications 

      Vega Bru, Didac; Rodríguez Martínez, Ángel (InTech - Open science/Open minds, 2017-06)
      Capítol de llibre
      Accés obert
      The knowledge of fundamental silicon questions and all aspects of silicon technology gives the possibility of improvement to both initial silicon material and devices on silicon basis. The articles for this book have been ...