Rosa Olivé‐Monllau

Institut de Microelectrònica de Barcelona

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Mireia Baeza

Universitat Autònoma de Barcelona

Francisco Céspedes

Universitat Autònoma de Barcelona

Jordi Bartrolı́

Universitat Autònoma de Barcelona

Francesc Xavier Muñoz

University of Geneva

Eva Baldrich

Vall d'Hebron Institut de Recerca

Jaume Barallat

Hospital Universitari Germans Trias i Pujol

Amparo Galán Ortega

Sociedad Española de Medicina Interna

Cynthia S. Martínez-Cisneros

Universidad Carlos III de Madrid

F. Javier del Campo

Ikerbasque

Javier Moral‐Vico

Universitat Autònoma de Barcelona

Cooperative Institutions

Universitat Autònoma de Barcelona

Institut de Microelectrònica de Barcelona

Centro Nacional de Microelectrónica

Consejo Superior de Investigaciones Científicas

Biosensores (Spain)

Institut Català de Nanociència i Nanotecnologia

Centre de Recerca Matemàtica

Centre for Research on Ecology and Forestry Applications

Pompeu Fabra University

Hospital Universitari Germans Trias i Pujol

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Development of Tunable Nanocomposites Made from Carbon Nanotubes for Electrochemical Applications

InTech eBooks (2011)

Maria Jose Mireia Baeza Rosa Olivé‐Monllau Francisco Cespedes Jordi Bartrolı́

The advent of the nanotechnology field has brought about novel devices and materials at the nanometer scale triggered by the demand of miniaturizing electronic, optical, actuating and sensing systems. In this nanotechnology era, the concept of nanocomposite has been brought to light though it has been present in nature and used from historical times. A nanocomposite can be defined as a material made of more than one solid phase where at least one of the constituent parts has a nanometer scale dimension. Building blocks with dimensions in the nanosize range make possible to design and create new materials with unprecedented versatility and improvement in their physical and chemical properties. The promise of nanocomposites lies in their multifunctionality for different applications and the possibility of unique combinations of properties unachievable with conventional materials. As mentioned before, the concept of enhancing properties and improving characteristics of materials through the creation of multiple phase nanocomposites is not recent. Mother Nature has a lot of examples of nanocomposites such as the structure of seashells and the bones. The idea has also been practiced since civilization started and humanity began producing more efficient materials for functional purposes. The Maya blue pigment, an ancient nanostructured material which was found to be very resistive to acids or (bio)corrosion phenomena, is a composite of organic and inorganic constituents, primarily leave dyes combined with a natural clay (Jose-Yacaman et al., 1996). Nanocomposites comprise a wide scope ranging from metal/ceramic nanocomposites, polymer-based nanocomposites to natural or biomimetic nanobiocomposites. They still share tremendous challenges, especially in the control over the distribution in size and dispersion of the nanosize constituents and in the tailoring and understanding of the role of the interfaces (Ajayan et al., 2003; Harris, 2004; Moniruzzaman et al., 2006; Spitalsky et al., 2010). Among the broad world of nanocomposites, the conducting ones attract special attention because of their special applications in electronics and electrochemistry (Grossiord et al.,

Nanometre

10.5772/14697

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Citations (6)

Chronoamperometric Magneto Immunosensor for Myeloperoxidase Detection in Human Plasma Based on a Magnetic Switch Produced by 3D Laser Sintering

Analytical Chemistry (2013)

Jaume Barallat Rosa Olivé‐Monllau Javier Gonzalo‐Ruiz Raúl Ramírez-Satorras Francesc Xavier Muñoz

In this work, an amperometric immunosensor for detection of myeloperoxidase (MPO) in human plasma is reported. Detection is based on the immobilization of anti-MPO antibodies onto magnetic beads (MBs). Following MPO immunocapture and washing steps, MBs are transferred to a customized modular detector device produced by 3D laser sintering. This tool integrates electrodes, electrical connectors, and a novel magnetic switch, whose functioning is founded on the vertical displacement of a permanent magnet. In this way, magnetic switching makes possible the confinement of MBs over the working electrode for electrochemical detection, followed by the release of MBs for electrode washing and reutilization. Notably, electrochemical detection is based on the endogenous MPO activity, which reduces reagent consumption and assay time compared to sandwich assays using enzyme-labeled antibodies. After optimization, the assay could be completed in 45 min and displayed a linear response between 0.9 and 60 ng mL(-1) for MPO and a limit of detection of 0.4 ng mL(-1). The real applicability of this approach is demonstrated by the ability to carry out the successful analysis of MPO in human plasma samples. Furthermore, the results allowed the classification of patients into three groups at risk of suffering cardiac events (i.e., low, medium, or high) and correlated well with data provided by a commercially available standardized method.

Amperometry

10.1021/ac401549d

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Citations (27)

Dual chronoamperometric detection of enzymatic biomarkers using magnetic beads and a low-cost flow cell

Biosensors and Bioelectronics (2015)

Javier Moral‐Vico Jaume Barallat Llibertat Abad Rosa Olivé‐Monllau Francesc Xavier Muñoz

10.1016/j.bios.2015.02.042

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Citations (29)

Integration of a sensitive carbon nanotube composite electrode in a ceramic microanalyzer for the amperometric determination of free chlorine

Sensors and Actuators B Chemical (2010)

Rosa Olivé‐Monllau Cynthia S. Martínez-Cisneros Jordi Bartrolı́Mireia Baeza Francisco Céspedes

Amperometry

10.1016/j.snb.2010.10.017

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Citations (32)

Highly sensitive CNT composite amperometric sensors integrated in an automated flow system for the determination of free chlorine in waters

Talanta (2010)

Rosa Olivé‐Monllau Ana Pereira Jordi Bartrolı́Mireia Baeza Francisco Céspedes

Amperometry

Tap water

10.1016/j.talanta.2010.03.008

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Citations (38)

Novel Amperometric Sensor Based on Rigid Near‐Percolation Composite

Electroanalysis (2009)

Rosa Olivé‐Monllau Mireia Baeza Jordi Bartrolı́Francisco Céspedes

Abstract A novel amperometric sensor based on a rigid graphite‐epoxy composite of which composition is near to the percolation is reported. The electrochemical response of the novel transducer material was evaluated in terms of reproducibility of the fabrication process and reproducibility and repeatability of the analytical signal. The signal to noise ratio was improved. atomic force microscopy (AFM) technique was used to obtain qualitatively information. Amperometric detection of chlorine in water was carried on at a set potential of −250 mV vs. Ag/AgCl. The developed flow injection analysis (FIA) system responded linearly to chlorine concentration between 0.15 mg L −1 and 4 mg L −1 with a sensitivity of −0.20 μA L mg −1 . The proposed system was applied to real samples from swimming‐pool water. No significant difference was observed regarding the standard method.

Amperometry

Repeatability

Percolation (cognitive psychology)

SIGNAL (programming language)

10.1002/elan.200804494

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Citations (19)

Flow injection analysis system based on amperometric thin-film transducers for free chlorine detection in swimming pool waters

Talanta (2008)

Rosa Olivé‐Monllau Jahir Orozco César Fernández‐Sánchez Mireia Baeza J. Bartrolí

Amperometry

Flow injection analysis

10.1016/j.talanta.2008.10.015

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Citations (49)

Characterization and optimization of carbon nanotube electrodes produced by magnetic entrapment: Application to paracetamol detection

Sensors and Actuators B Chemical (2013)

Rosa Olivé‐Monllau Francesc Xavier Muñoz Eva Baldrich

10.1016/j.snb.2013.05.066

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Citations (20)

Electrochemical biosensing of non-electroactive targets using ferrocene-labeled magnetic particles and CNT wiring

The Analyst (2014)

Zorione Herrasti Rosa Olivé‐Monllau Francesc Xavier Muñoz Fernando Martínez Eva Baldrich

We show that target binding onto ferrocene-modified magnetic microparticles (MP-Fc) promotes physical sheltering of the labels. This can be measured electrochemically by CNT wiring, which enhances ten-fold the signals registered compared to direct detection of the MPs alone. As a proof of concept, detection of detergents and antibodies is accomplished. In these preliminary experiments, random binding of 0.01% Tween 20 onto MP-Fc was detectable both voltametrically and impedimetrically after a 2 min incubation. Furthermore, affinity capture of 4 μg mL−1 of biotinylated antibody by streptavidin MP-Fc could be measured in less than 30 min and even in the presence of 1 mg mL−1 of BSA.

10.1039/c3an02276e

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Citations (5)

Strategies for the optimization of carbon nanotube/polymer ratio in composite materials: Applications as voltammetric sensors

Sensors and Actuators B Chemical (2010)

Rosa Olivé‐Monllau M.J. Esplandiu Jordi Bartrolı́Mireia Baeza Francisco Céspedes

Chronoamperometry

Amperometry

10.1016/j.snb.2010.02.017

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Citations (47)