Artículos científicos destacados

A suspended p-type Si nanowire incorporating Si nanocrystal quantum dots has been used to form a single-hole transistor. Fabrication is based on focused Ga ion beam exposure and anisotropic wet etching. Electrical characteristics at 10K show Coulomb diamonds with charging energy ~27 meV, associated with a single dominant nanocrystal.
Appl. Phys. Lett. 107, 223501 (2015)

A novel suspended planar-array chips technology is described, which effectively allows molecular multiplexing using a single suspended chip to analyze extraordinarily small volumes. The suspended chips are fabricated by combining silicon-based technology and polymer-pen lithography, obtaining increased molecular pattern flexibility, and improving miniaturization and parallel production. The chip miniaturization is so dramatic that it permits the intracellular analysis of living cells.
Adv. Mater. 2016, 28, 1449-1454

For development of an impedimetric biosensor to quantify viable bacterial cells, this work defines the relationships between microbial growth and impedance changes associated with acidification of the culture medium. Performed experiments demonstrated the capacity of the method to detect E.coli concentrations in a range between 10x2 and 10x6 cfu/mL in milk in only 6 hours with 5–12% error margin.
Electrochimica Acta, 198 (2016), pp. 249–258 . 

 Resistive switching conduction in Ni/HfO2/Si capacitors is studied at temperatures ranging from 77 to 473 K. A model for the low-resistance state (LRS) consistent with the experimental data is proposed. The LRS current–voltage curves show a maximum resistance, R0, at zero bias and a minimum value, R∞, at voltages close to reset, which indicates a departure from linearity. A three-parameter model for the I–V curves is reported and its temperature dependence analyzed.
IEEE Trans. Electron Devices 63 (5), pp. 1877-1883 (2016).

In this work, the feasibility of using multi-material pSi-Cr-Au intracellular chips for multifunctional applications by characterizing their interactions with two different cell lines, one tumorigenic and one non-tumorigenic has been explored.
Nanoscale, 2016,8, 8773-8783

A new type of electrically controlled and fully integrated wax microvalve is described in this work. The valve is designed for multiple actuation and has a small footprint (< 0.5 mm2), fast response (< 0.3 s) and low energy consumption (< 35 mJ).
 Lab Chip, 2016,16, 3969-3976

The aim of the present study was to combine the use of miniaturized and integrated impedimetric transducers and antimicrobial peptide AMPs to obtain biosensors with high sensitivity to monitor bacterial colonization to prevent implant-related infections.. Streptococcus sanguinis, which is one of the most prevalent strains in the onset of periodontal diseases, was used as a model of oral bacteria. To this end, a potent AMP derived from human lactoferrin was synthesized and covalently immobilized on interdigitated electrode arrays (IDEA). X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) were employed to optimize and characterize the method of immobilization.
Biosensors and Bioelectronics, vol. 86, 2016, pp.377-385.

A new solid contact ion selective electrode with intermediate conducting polymer (CP) layer formed by electropolymerization on a gold electrode of a bifunctional monomer, n-phenyl-ethylenediaminemethacrylamide (NPEDMA), which contains a methacrylamide group attached to aniline, is presented. Ion-selective membrane based on acrylated urethane polymer was shown to co-polymerize with the CP forming highly adhesive boundary. The designed ion-selective electrode was successfully used for determination of total calcium ion concentration in blood serum samples.
Analytica Chimica Acta, vol. 943, 2016, pp. 50-57.

The development of an amperometric biosensor for L-malate determination showing long-term stability is reported in this work. The biosensor is based on a thin-film gold electrochemical transducer and a three-dimensional membrane of polypyrrole entrapping malate dehydrogenase and diaphorase enzymes. It was applied to monitor the malolactic fermentation of three red wines, showing a good agreement with the standard colorimetric method.
Anal. Chim. Acta 954 (2017) 105-113. 

This paper studies by experimentation and physics-based simulation the Short-Circuit (SC) capability of several normally-off 600-650 V Gallium Nitride High-Electron-Mobility Transistors (GaN HEMTs): cascodes, p-GaN, and GaN Metal-Insulator-Semiconductor HEMTs (MISHEMTs). As a result, cascodes present the worst SC ruggedness. By contrast, p-GaN gate HEMTs and MISHEMTs provide a higher SC capability thanks to their strong drain current reduction. In addition, a valuable state-of-the-art about all commercially available technologies is also provided, which demonstrates that current GaN devices do not allow SC capability.
IEEE Transactions on Industrial Electronics, 64 (11), pp. 9012-9022 (2017).