10 results on '"Canalejas Tejero, Víctor"'
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2. A top-down approach for fabricating three-dimensional closed hollow nanostructures with permeable thin metal walls
- Author
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Barrios, Carlos Angulo, primary and Canalejas-Tejero, Víctor, additional
- Published
- 2017
- Full Text
- View/download PDF
3. Micro-Shaping of Nanopatterned Surfaces by Electron Beam Irradiation
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Barrios, Carlos, primary and Canalejas-Tejero, Víctor, additional
- Published
- 2016
- Full Text
- View/download PDF
4. Aluminum Nanoholes for Optical Biosensing
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Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Instituto de Reconocimiento Molecular y Desarrollo Tecnológico - Institut de Reconeixement Molecular i Desenvolupament Tecnològic, Ministerio de Economía y Competitividad, Angulo Barrios, Carlos, Canalejas Tejero, Víctor, Herranz, Sonia, Urraca, Javier, Moreno-Bondi, María Cruz, Avella-Oliver, Miquel, Maquieira Catala, Ángel, Puchades, Rosa, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Instituto de Reconocimiento Molecular y Desarrollo Tecnológico - Institut de Reconeixement Molecular i Desenvolupament Tecnològic, Ministerio de Economía y Competitividad, Angulo Barrios, Carlos, Canalejas Tejero, Víctor, Herranz, Sonia, Urraca, Javier, Moreno-Bondi, María Cruz, Avella-Oliver, Miquel, Maquieira Catala, Ángel, and Puchades, Rosa
- Abstract
[EN] Sub-wavelength diameter holes in thin metal layers can exhibit remarkable optical features that make them highly suitable for (bio)sensing applications. Either as efficient light scattering centers for surface plasmon excitation or metal-clad optical waveguides, they are able to form strongly localized optical fields that can effectively interact with biomolecules and/or nanoparticles on the nanoscale. As the metal of choice, aluminum exhibits good optical and electrical properties, is easy to manufacture and process and, unlike gold and silver, its low cost makes it very promising for commercial applications. However, aluminum has been scarcely used for biosensing purposes due to corrosion and pitting issues. In this short review, we show our recent achievements on aluminum nanohole platforms for (bio)sensing. These include a method to circumvent aluminum degradation-which has been successfully applied to the demonstration of aluminum nanohole array (NHA) immunosensors based on both, glass and polycarbonate compact discs supports-the use of aluminum nanoholes operating as optical waveguides for synthesizing submicron-sized molecularly imprinted polymers by local photopolymerization, and a technique for fabricating transferable aluminum NHAs onto flexible pressure-sensitive adhesive tapes, which could facilitate the development of a wearable technology based on aluminum NHAs.
- Published
- 2015
5. Aluminum Nanoholes for Optical Biosensing
- Author
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Barrios, Carlos, primary, Canalejas-Tejero, Víctor, additional, Herranz, Sonia, additional, Urraca, Javier, additional, Moreno-Bondi, María, additional, Avella-Oliver, Miquel, additional, Maquieira, Ángel, additional, and Puchades, Rosa, additional
- Published
- 2015
- Full Text
- View/download PDF
6. Aluminum Nanohole Arrays Fabricated on Polycarbonate for Compact Disc-Based Label-Free Optical Biosensing
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Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Instituto de Reconocimiento Molecular y Desarrollo Tecnológico - Institut de Reconeixement Molecular i Desenvolupament Tecnològic, Ministerio de Ciencia e Innovación, Ministerio de Economía y Competitividad, Generalitat Valenciana, Angulo Barrios, Carlos, Canalejas Tejero, Víctor, Herranz, S., Moreno Bondi, M., Avella-Oliver, Miquel, Puchades, Rosa, Maquieira Catala, Ángel, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Instituto de Reconocimiento Molecular y Desarrollo Tecnológico - Institut de Reconeixement Molecular i Desenvolupament Tecnològic, Ministerio de Ciencia e Innovación, Ministerio de Economía y Competitividad, Generalitat Valenciana, Angulo Barrios, Carlos, Canalejas Tejero, Víctor, Herranz, S., Moreno Bondi, M., Avella-Oliver, Miquel, Puchades, Rosa, and Maquieira Catala, Ángel
- Abstract
[EN] Al nanohole array plasmonic biosensors have been fabricated on polycarbonate (PC) substrates from conventional compact discs (CD). Standard micro and nanofabrication processes have been used and optimized to be PC compatible. The viability of this CD-based plasmonic platform for label-free optical biosensing has been demonstrated through a competitive bioassay for biotin analysis using biotin-functionalized dextran-lipase conjugates immobilized on the transducer surface.
- Published
- 2014
7. Magnetophotonic response of three-dimensional opals
- Author
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Caicedo, José Manuel, Pascu, Oana, López-García, Martín, Canalejas-Tejero, Víctor, Blanco Montes, Álvaro, López, Cefe, Fontcuberta, Josep, Roig Serra, Anna, Herranz, Gervasi, Caicedo, José Manuel, Pascu, Oana, López-García, Martín, Canalejas-Tejero, Víctor, Blanco Montes, Álvaro, López, Cefe, Fontcuberta, Josep, Roig Serra, Anna, and Herranz, Gervasi
- Abstract
Three-dimensional magnetophotonic crystals (3D-MPCs) are being postulated as appropriate platforms to tailor the magneto-optical spectral response of magnetic materials and to incorporate this functionality in a new generation of optical devices. By infiltrating self-assembled inverse opal structures with monodisperse nickel nanoparticles we have fabricated 3D-MPCs that show a sizable enhancement of the magneto-optical signal at frequencies around the stop-band edges of the photonic crystals. We have established a proper methodology to disentangle the intrinsic magneto-optical spectra from the nonmagnetic optical activity of the 3D-MPCs. The results of the optical and magneto-optical characterization are consistent with a homogeneous magnetic infiltration of the opal structure that gives rise to both a red-shift of the optical bandgap and a modification of the magneto-optical spectral response due to photonic bandgap effects. The results of our investigation demonstrate the potential of 3D-MPCs fabricated following the approach outlined here and offer opportunities to adapt the magneto-optical spectral response at optical frequencies by appropriate design of the opal structure or magnetic field strength. © 2011 American Chemical Society.
- Published
- 2011
8. Ultrathin conformal coating for complex magneto-photonic structures
- Author
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Pascu, Oana, Caicedo, José Manuel, López-García, Martín, Canalejas-Tejero, Víctor, Blanco Montes, Álvaro, López, Cefe, Arbiol, J., Fontcuberta, Josep, Roig Serra, Anna, Herranz, Gervasi, Pascu, Oana, Caicedo, José Manuel, López-García, Martín, Canalejas-Tejero, Víctor, Blanco Montes, Álvaro, López, Cefe, Arbiol, J., Fontcuberta, Josep, Roig Serra, Anna, and Herranz, Gervasi
- Abstract
We report on an extremely fast and versatile synthetic approach, based on microwave assisted sol-gel chemistry, that allows a conformal nanometric coating of intricate three-dimensional structures. Using this methodology, we have achieved a conformal coverage of large areas of three-dimensional opals with a superparamagnetic manganese ferrite layer, yielding magneto-photonic crystals with excellent quality. The use of a ternary oxide for the ultrathin coating demonstrates the potential of this methodology to realize three-dimensional structures with complex materials that may find applications beyond photonics, such as energy, sensing or catalysis. © 2011 The Royal Society of Chemistry.
- Published
- 2011
9. Water-dependent photonic bandgap in silica artificial opals
- Author
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Gallego-Gómez, Francisco, Blanco Montes, Álvaro, Canalejas-Tejero, Víctor, López, Cefe, Gallego-Gómez, Francisco, Blanco Montes, Álvaro, Canalejas-Tejero, Víctor, and López, Cefe
- Abstract
Some characteristics of silica-based structuresa-like the photonic properties of artificial opals formed by silica spheresa-can be greatly affected by the presence of adsorbed water. The reversible modification of the water content of an opal is investigated here by moderate heating (below 300 °C) and measuring in situ the changes in the photonic bandgap. Due to reversible removal of interstitial water, large blueshifts of 30 nm and a bandgap narrowing of 7% are observed. The latter is particularly surprising, because water desorption increases the refractive index contrast, which should lead instead to bandgap broadening. A quantitative explanation of this experiment is provided using a simple model for water distribution in the opal that assumes a nonclose-packed fcc structure. This model further predicts that, at room temperature, about 50% of the interstitial water forms necks between nearest-neighbor spheres, which are separated by 5% of their diameter. Upon heating, dehydration predominantly occurs at the sphere surfaces (in the opal voids), so that above 65 °C the remaining water resides exclusively in the necks. A near-close-packed fcc arrangement is only achieved above 200 °C. The high sensitivity to water changes exhibited by silica opals, even under gentle heating of few degrees, must be taken into account for practical applications. Remarkably, accurate control of the distance between spheresa-from 16 to 1 nma-is obtained with temperature. In this study, novel use of the optical properties of the opal is made to infer quantitative information about water distribution within silica beads and dehydration phenomena from simple reflection spectra. Taking advantage of the well-defined opal morphology, this approach offers a simple tool for the straightforward investigation of generic adsorption-desorption phenomena, which might be extrapolated to many other fields involving capillary condensation. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Published
- 2011
10. Desarrollo de superficies nanoestructuradas para biosensores ópticos y sensores biomiméticos
- Author
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Canalejas Tejero, Víctor and Angulo Barrios, Carlos
- Subjects
Telecomunicaciones - Abstract
La presente Tesis Doctoral es de carácter tecnológico y está enfocada al desarrollo de nuevos biosensores y sensores biomiméticos ópticos. El trabajo ha consistido en la fabricación y caracterización de películas micro/nano−estructuradas en distintos materiales para (bio)detección óptica, empleándose como herramienta principal de nanoestructuración la litografía por haz de electrones (EBL). El objetivo general es lograr mejoras y novedades en el campo de los biosensores ópticos, tanto en lo referente a las prestaciones de los dispositivos como al coste de fabricación de los mismos. Este trabajo se puede dividir en tres partes. En la primera parte se expone el trabajo realizado para lograr sensores biomiméticos basados en polímeros de impronta molecular (MIP), micro y nanoestructurados directamente mediante EBL, algo no realizado con anterioridad a esta Tesis, y con fotolitografía UV. Se ha conseguido demostrar que el copolímero P(MAA-co-MAAEMA) se comporta simultáneamente como MIP y resina de EBL, permitiendo la nanoestructuración directa de películas de este material MIP mediante EBL. En el proceso previo a la consecución de esta demostración, se han obtenido otros resultados de relevancia relacionados con las propiedades ópticas (fotoluminiscencia) y tecnológicas (resinas de alta sensibilidad y doble comportamiento) de resinas comerciales de PMMA y PMMA/MA y del copolímero P(HEMA-co-MAAEMA). El segundo bloque contiene el trabajo desarrollado para obtener (bio)sensores plasmónicos sin marcado basados en redes de nanoagujeros realizadas en aluminio, susceptibles de ser interrogados ópticamente y capaces de detectar variaciones muy pequeñas de índice de refracción en el medio circundante. La novedad ha consistido en proteger eficazmente la superficie de aluminio frente a medios acuosos tamponados, frecuentes en bioensayos, obteniendo dispositivos competitivos frente a los fabricados habitualmente con oro, un metal miles de veces más costoso que el aluminio. Las prestaciones y la estabilidad de los dispositivos fabricados se estudiaron con diferentes pruebas de resistencia, experimentos de determinación de la sensibilidad volumétrica al índice de refracción empleando disolventes, y con ensayos de biodetección realizados como prueba de concepto. Las redes de nanoagujeros han sido fabricadas sobre dos tipos de sustratos: vidrio y policarbonato procedente de CDs y DVDs, esto último con el fin de desarrollar una tecnología que permita la integración de estos dispositivos en discos ópticos comerciales. Además, se ha investigado la transferencia de películas metálicas nanoestructuradas fabricadas sobre policarbonato a una cinta adhesiva flexible de uso común, estudiándose la sensibilidad refractométrica de la estructura resultante. En la tercera y última parte se muestra el trabajo realizado destinado a obtener (bio)sensores sin marcado basados en redes de nanopilares de resina comercial SU−8 fabricados con EBL sobre una película de aluminio depositada en sustratos de silicio, tratando de mejorar las prestaciones de estructuras similares previamente publicadas. Para ello, se ha propuesto e investigado una configuración consistente en redes de nanopilares con forma de neiloide truncado obtenidos tras la aplicación de cierto grado de desenfoque durante la litografía. Los nanopilares resultantes presentan un ensanchamiento en la base, creando una capa delgada de resina entre ellos, originando un efecto de resonancia de modo guiado. Este efecto produce una respuesta óptica espectral que cuenta con una resonancia de alto factor de calidad y muy sensible a los cambios de índice de refracción del medio circundante. Considerando tanto la sensibilidad como la calidad de la resonancia, se ha demostrado que el factor de mérito de la estructura propuesta mejora hasta en dos órdenes de magnitud el de dispositivos similares anteriores con mayor superficie sensora, sin añadir mayor coste o complejidad al proceso de fabricación. ABSTRACT The present Doctoral Thesis is a technology−based work focused on the development of novel optical biosensors and biomimetic sensors. The work has consisted of the fabrication and characterization of micro/nano−structured thin films made with different materials for optical (bio)detection, using electron beam lithography (EBL) as the main fabrication tool. The general goal is to achieve improvements and innovations in the optical biosensors field, considering both performance and production cost. This work can be divided in three parts. The first part of the Thesis describes the work performed to achieve biomimetic sensors based on molecularly imprinted polymers (MIP), directly micro and nanostructured using EBL, which has not been done before this Thesis, and also UV photolithography. The copolymer P(MAA-co-MAAEMA) has been demonstrated as a MIP capable of direct nanostructuration with EBL. Other relevant results related with optical (photoluminiscence) and technological (high sensitivity, dual tone resists) properties of the copolymer P(HEMA-co-MAAEMA), and also PMMA and PMMA/MA commercial resists, were obtained in the previous works which led to the MIP based biomimetic sensor. The second block contains the work related with the development of label−free plasmonic (bio)sensors based on nanoholes arrays fabricated in aluminium films, subject to optical interrogation and capable of detecting very small refractive index variations in the surrounding enviroment. The novelty has consisted of achieving an efficient protection of the aluminium surface against buffered aqueous solutions, thus obtaining competitive devices without the need of using gold, usually applied to similar purposes, which is thousands of times more expensive than aluminium. The performance and the stability of the devices were studied by different endurance tests, also with experiments of acquisition of the volumetric sensitivity to refractive index using solvents, and with biosensing experiments as proof of concept tests. The nanoholes arrays have been fabricated using two different substrates: glass and polycarbonate from CDs and DVDs, opening the door to the development of a technology which allows for the integration of the devices on commercial optical discs. In addition, the transfer of the metallic nanostructures fabricated on polycarbonate to common use, flexible stick tape, was investigated, as well as the refractometric sensitivity of the transferred devices. The third and last part shows the work related with the development of label−free biosensors based on SU−8 nanopillars arrays made with EBL onto an aluminium film deposited on silicon substrate, trying to improve the performance of similar architectures previously published. With this purpose, a new nanostructure consisting of truncated neiloid shape pillars, made by applying out−of−focus electron beam exposition during the lithography, has been investigated. The resultant nanopillars present a base widening, creating a resist thin film among them, and producing a guided−mode resonance effect. This effect produces an optical reflectance spectrum featuring a high quality resonance, which is very sensitive to refractive index variations of the environment in contact with the nanostructure surface. Considering both the sensitivity and the quality of the studied resonance, the developed (bio)sensors have demonstrated that the figure of merit of the proposed structure improves in two orders of magnitude comparing with previously published architectures, without adding extra cost or complexity during the manufacture process.
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