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Martinez-Tong D.E.,CSIC - Institute for the Structure of Matter | Soccio M.,CSIC - Institute for the Structure of Matter | Garcia-Gutierrez M.C.,CSIC - Institute for the Structure of Matter | Nogales A.,CSIC - Institute for the Structure of Matter | And 4 more authors.
Applied Physics Letters | Year: 2013

In this work, well-defined low aspect ratio nanostructures based on nanogratings on thin films of poly(vinylidene fluoride-trifluoroethylene) copolymers were prepared. By using these nanogratings, an improved management of writing and reading information of about 500 Gbit/in.2 (0.01 bit/nm2) can be reached as revealed by Piezoresponse Force Microscopy. Structural investigation by means of X-ray diffraction techniques indicates that the physical confinement generated by nanoimprint promotes the development of smaller and edge-on oriented crystals. Our results evidence that one-dimensional nanostructuring can be a straightforward approach to improve the control of the polarization in ferroelectric polymer thin films. © 2013 AIP Publishing LLC.

Campanella H.,Institute Microelectronica Of Barcelona Imb Cnm Csic
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010 | Year: 2010

Tolerances of the fabrication process, the layout design, the process design, and the physical environment of operation may affect the resonance frequency of thin-film bulk acoustic wave resonators (FBAR). Consequences are poor stability, increased phase noise, and performance degradation at the system level. This paper reviews a variety of frequency tuning mechanisms and techniques intended for frequency control in FBARs. Techniques are classified among fabrication, post-fabrication and during-operation frequency compensation. © 2010 EuMA.

Diaz-Gonzalez M.,Institute Microelectronica Of Barcelona Imb Cnm Csic | Baldi A.,Institute Microelectronica Of Barcelona Imb Cnm Csic
Analytical Chemistry | Year: 2012

In this work, a new fabrication technology for microfluidics based on the use of wax is described. Microfluidic structures are assembled using wax as both a thermoplastic adhesive layer between two glass substrates and a spacer layer defining the microchannels. Wax patterns with dimensions down to 25 μm are easily produced on glass substrates using specially developed decal-transfer microlithography. A complete microfluidic system is created by bonding the wax patterned layer with an additional glass substrate. On the basis of the special melting behavior of waxes, an effective glass-wax bonding is achieved at 40 °C by applying a soft pressure and without the requirement of any glass pretreatment. Wax bonding provides an effective sealing of the fluidic networks even on nonflat glass substrates (i.e., containing metal electrodes). The mild conditions required for the bonding process enables the fabrication of lab-on-a-chip devices incorporating biomolecules, as is demonstrated with the implementation of a simple heterogeneous immunoassay in a microfluidic device with amperometric detection. © 2012 American Chemical Society.

Robaina R.R.,Institute Microelectronica Of Barcelona Imb Cnm Csic | Plaza J.A.,Institute Microelectronica Of Barcelona Imb Cnm Csic
Sensors and Actuators, A: Physical | Year: 2010

This paper focuses on the design and experimental test of a null-offset differential electromagnetic sensor characterized by simplicity, flexibility and low cost. This sensor consists of two planar excitation coils, which generate magnetic field and a planar acquisition coil, which senses the sample material. The differential configuration of the sensor improves signal conditioning and reduces the common-mode noise. We present analytical and numerical (simulation) studies of the working principle. Experiments were performed to test the ability of the sensor to detect non-invasively: (i) the presence of metallic samples and (ii) the variations of glucose in human blood. © 2010 Elsevier B.V. All rights reserved.

Abramova N.,Institute Microelectronica Of Barcelona Imb Cnm Csic | Levichev S.,Saint Petersburg State University | Bratov A.,Institute Microelectronica Of Barcelona Imb Cnm Csic
Talanta | Year: 2010

The influence of CO2 and acetic acid on the response of ISFET sensors with PVC and photocured polyurethane polymer membranes with valinomycin as an ionophore was assessed. Experimental results show that the presence of these compounds has no effect on sensors parameters even after prolonged soaking in a water solution. Using a photocured polyurethane polymer as an ion-selective membrane matrix for an ISFET, a carbonate ion sensor was developed with hexyl-p-trifluoroacetylbenzoate (HE) as an ionophore. Effect of cationic and anionic lipophilic additives on the sensors response was studied. Sensors with the optimized membrane composition based on HE (7.9%, w/w) and tridodecylmethylammonium chloride (5.7%, w/w) show sensitivity of 27-30 mV per decade of carbonate ion concentration, sufficient selectivity in front of chloride ions, and a lifetime of 3-5 months. © 2010 Elsevier B.V. All rights reserved.

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