Placa homogeneizadora de temperatura para microdispositivos térmicamente aislados

Referencia OEPM: P9601571.-- Fecha de solicitud: 12/07/1996.-- Titular: Consejo Superior de Investigaciones Científicas (CSIC).Placa homogeneizadora de temperatura para microdispositivos térmicamente aislados (ver figura en archivo de texto adjunto). El objeto de la presente invención es el desarrollo de una microestructura térmicamente aislada con zonas de temperatura muy homogénea y controlada. Dichas estructuras son la base de distintos tipos de sensores microelectrónicos ya existentes, en los que un cierto material o elemento sensible se deposita sobre una estructura térmica que debe trabajar a una temperatura conocida. Es aplicable a sistemas de medida microelectrónica basados en microsensores de silicio.Peer reviewe

Nanocrystalline tin oxide nanofibers deposited by a novel focused electrospinning method. Application to the detection of TATP precursors

A new method of depositing tin dioxide nanofibers in order to develop chemical sensors is presented. It involves an electrospinning process with in-plane electrostatic focusing over micromechanized substrates. It is a fast and reproducible method. After an annealing process, which can be performed by the substrate heaters, it is observed that the fibers are intertwined forming porous networks that are randomly distributed on the substrate. The fiber diameters oscillate from 100 nm to 200 nm and fiber lengths reach several tens of microns. Each fiber has a polycrystalline structure with multiple nano-grains. The sensors have been tested for the detection of acetone and hydrogen peroxide (precursors of the explosive triacetone triperoxide, TATP) in air in the ppm range. High and fast responses to these gases have been obtained. © 2014 by the authors; licensee MDPI, Basel, Switzerland.This work has been supported by the Spanish Science and Innovation Ministry under the projects TEC2010-21357-C05-04 and TEC2013-48147-C6-4-R. Authors want to thank University of Extremadura for SEM and XRD analysis. We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI)Peer Reviewe

Love-Wave Sensors Combined with Microfluidics for Fast Detection of Biological Warfare Agents

The following paper examines a time-efficient method for detecting biological warfare agents (BWAs). The method is based on a system of a Love-wave immunosensor combined with a microfluidic chip which detects BWA samples in a dynamic mode. In this way a continuous flow-through of the sample is created, promoting the reaction between antigen and antibody and allowing a fast detection of the BWAs. In order to prove this method, static and dynamic modes have been simulated and different concentrations of BWA simulants have been tested with two immunoreactions: phage M13 has been detected using the mouse monoclonal antibody anti-M13 (AM13), and the rabbit immunoglobulin (Rabbit IgG) has been detected using the polyclonal antibody goat anti-rabbit (GAR). Finally, different concentrations of each BWA simulants have been detected with a fast response time and a desirable level of discrimination among them has been achieved.This work was supported by the Spanish Science and Innovation Ministry under the project TEC2010-21357-C05-04, and a postdoctoral fellowship at the National Autonomous University of Mexico.We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI)Peer reviewe

Portable low-cost electronic nose based on surface acoustic wave sensors for the detection of BTX vapors in air

A portable electronic nose based on surface acoustic wave (SAW) sensors is proposed in this work to detect toxic chemicals, which have a great potential to threaten the surrounding natural environment or adversely affect the health of people. We want to emphasize that ferrite nanoparticles, decorated (Au, Pt, Pd) and undecorated, have been used as sensitive coatings for the first time in these types of sensors. Furthermore, the proposed electronic nose incorporates signal conditioning and acquisition and transmission modules. The electronic nose was tested to low concentrations of benzene, toluene, and xylene, exhibiting excellent performance in terms of sensitivity, selectivity, and response time, indicating its potential as a monitoring system that can contribute to the detection of toxic compounds.This work was supported by the Fundación General CSIC via Programa ComFuturo and the Spanish Ministry of Science, Innovation and Universities under the projects RTI2018-095856-B-C22 (AEI/FEDER) and TEC2016-79898-C6 (AEI/FEDER).Peer reviewe

Room Temperature Ethanol Microsensors Based on Silanized Tungsten Oxide Nanowires

Gas microsensors based on tungsten oxide (WO3-x) nanowires (NWs) silanized with APTES (3-aminopropyltriethoxysilane) are developed in this work. These surface modified microsensors are highly sensitive to ethanol at room temperature (RT) via photoactivation and show enhanced selectivity towards other volatile organic compounds (VOCs) including acetone and toluene.This work has been supported by the Czech Science Foundation (GAČR) via Grant no. 17-16531S. The support of the Spanish Ministry of Economy and Competitiveness via the Ramón y Cajal programme and projects TEC2015-74329-JIN-(AEI/FEDER, EU) and TEC2016-79898-C6-1-R (AEI/FEDER, EU) are also acknowledgedPeer reviewe

Cerium oxide-tungsten oxide core-shell nanowire-based microsensors sensitive to acetone

Gas sensitive cerium oxide-tungsten oxide core-shell nanowires are synthesized and integrated directly into micromachined platforms via aerosol assisted chemical vapor deposition. Tests to various volatile organic compounds (acetone, ethanol, and toluene) involved in early disease diagnosis demonstrate enhanced sensitivity to acetone for the core-shell structures in contrast to the non-modified materials (i.e., only tungsten oxide or cerium oxide). This is attributed to the high density of oxygen vacancy defects at the shell, as well as the formation of heterojunctions at the core-shell interface, which provide the modified nanowires with ‘extra’ chemical and electronic sensitization as compared to the non-modified materials.This work has been supported by the Czech Science Foundation (GAČR) via Grant no. 17-16531S, and the Spanish Ministry of Science and Innovation via the Ramón y Cajal Programme and Grants TEC2015-74329-JIN-(AEI/FEDER,EU) and TEC2016-79898-C6-(AEI/FEDER,EU). This research has used the Spanish ICTS Network MICRONANOFABS (partially funded by MINECO). CEITEC Nano Research Infrastructure (IDLM2015041, MEYS CR, 2016–2019) is also acknowledged.Peer reviewe

Cerium oxide-tungsten oxide core-shell nanowire-based microsensors sensitive to acetone

Gas sensitive cerium oxide-tungsten oxide core-shell nanowires are synthesized and integrated directly into micromachined platforms via aerosol assisted chemical vapor deposition. Tests to various volatile organic compounds (acetone, ethanol, and toluene) involved in early disease diagnosis demonstrate enhanced sensitivity to acetone for the core-shell structures in contrast to the non-modified materials (i.e., only tungsten oxide or cerium oxide). This is attributed to the high density of oxygen vacancy defects at the shell, as well as the formation of heterojunctions at the core-shell interface, which provide the modified nanowires with ‘extra’ chemical and electronic sensitization as compared to the non-modified materials.This work has been supported by the Czech Science Foundation (GAČR) via Grant no. 17-16531S, and the Spanish Ministry of Science and Innovation via the Ramón y Cajal Programme and Grants TEC2015-74329-JIN-(AEI/FEDER,EU) and TEC2016-79898-C6-(AEI/FEDER,EU). This research has used the Spanish ICTS Network MICRONANOFABS (partially funded by MINECO). CEITEC Nano Research Infrastructure (IDLM2015041, MEYS CR, 2016–2019) is also acknowledged.Peer reviewe

Electrical characterization of thermomechanically stable YSZ membranes for micro solid oxide fuel cells applications

10 páginas, 10 figuras, 3 tablas.Yttria-stabilized zirconia free-standing membranes were fabricated by pulsed laser deposition on Si/SiO2/Si3N4 structures for developing silicon-based micro devices for micro solid oxide fuel cell applications. Their mechanical stability under working conditions was evaluated satisfactorily by applying thermal cycling to the membranes. Membranes mechanically stable at operating temperatures as high as 700 °C were obtained for deposition temperatures in the range between 400 and 700 °C. Thermomechanical behavior as measured by X-ray microdiffraction was correlated with the evolution of the microstructure with the temperature from TEM analysis, comparing as-deposited and post-deposition annealed membranes. Electrical properties of both yttria-stabilized zirconia films and membranes were studied by DC conductivity and impedance spectroscopy, respectively. A difference of almost one order of magnitude was measured between bulk and stressed films while conductivities close to the bulk were observed for YSZ membranes. Values of area specific resistance of 0.15 Ωcm2 were measured at temperatures below 450 °C for 240 nm thick YSZ membranes deposited at 600 °C and annealed at the same temperature for 2.5 h.This investigation has been supported by the Spanish Ministry of Science and Education (MAT-2008-04931, CSD-2008-023 and TEC- 2007-64669 projects) and the “Generalitat de Catalunya” (2009-SGR- 228). A.T., N.S would like to thank the financial support of the postdoctoral program “Ramón y Cajal” (MICINN) and A.C to the postdoctoral program “Juan de la Cierva” (MICINN)Peer reviewe

Membrana de electrolito polimérico híbrida y sus aplicaciones

Membrana de electrolito polimérico híbrida y sus aplicaciones. La invención describe una membrana de electrolito polimérico híbrida que comprende dos polímeros distintos espacialmente dispuestos de tal forma que ambos constituyen una estructura donde uno de los polímeros, que es un polímero de siloxano, hace de base perforada para que el otro polímero, que es un electrolito polimérico, se pueda distribuir en él las perforaciones en forma de canales. Esta membrana es útil para la fabricación de dispositivos de electrolitos poliméricos, como por ejemplo, las pilas de combustible, electrolizadores y pilas microbianas, permitiendo un mayor nivel de integración de la membrana con el resto de los componentes, una reducción en el tamaño de los dispositivos, compatibilidad con materiales rígidos.Peer reviewedConsejo Superior de Investigaciones Científicas (España)A1 Solicitud de patentes con informe sobre el estado de la técnic

Optimized design of a SAW sensor array for chemical warfare agents simulants detection

Chemical warfare agent simulants detection is of great interest for security reasons. An electronic nose based on Surface Acoustic Wave (SAW) sensors has been developed and sensor polymer coatings have been optimized. These allowed us to detect very low concentrations of certain simulants. A good classification was achieved.This work is being supported by the Spanish Education and Science Ministry under the project TEC2007-67962- C04-02.Peer reviewe