Test of a dispersion sweep correction system using a centroid in the DIRAC beam line

A new proton beam position detector named "centroid" is placed in the DIRAC target situation and is aligned with respect to the beam. Behind it there is a set of various targets used for the DIRAC experiment. The "centroid" itself collects the secondary electrons, which are emitted by the target when hit by the proton beam. This provides an on-line verification of the beam position without obstructing the beam path by a screen, and without perturbing the experiment. A computer application then calculates the corrections needed to centre the beam in both planes as a function of time. This report will explain how this is done

Optimum functionalization of Si nanowire FET for electrical detection of DNA hybridization

International audienceIn this work, we demonstrate a wafer-scale fabrication of biologically sensitive Si nanowire FET for pH sensing and electrical detection of deoxyribonucleic acid (DNA) hybridization. Based on conventional "top-down" CMOS compatible technology, our bioFETs explore a wide range of design (nanowires (NW), nanoribbons (NR), and honeycomb (HC) structures) with opening access scaled down to only 120 nm. After device fabrication, I DS-V BG transfer and I DS-V DS output characteristics show a conventional n-type FET behavior with an I ON /I OFF value higher than 10 5 , as well as an increase of threshold voltage as the NW width is reduced. Then, using a capacitive coupling in our dually-gated Si bioFETs, the pH sensitivity is enhanced with a pH response up to 600 mV/pH. Finally, we successfully detected an increase of threshold voltage of n-type silicon nanowires (SiNWs) due to hybridized target DNA molecules

Wafer-scale fabrication of biologically sensitive Si nanowire FET: from pH sensing to electrical detection of DNA hybridization

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Capacitive micromachined ultrasonic transducers leak detection by dye penetrant test

International audienceDye penetrant test has been used to detect non hermetic capacitive micromachined ultrasonic transducers (CMUTs). The method has proven its ability to highlight faulty CMUTs membranes among more than hundreds of CMUTs membranes. The fluorescence microscopy image highlights the defective CMUTs with a strong contrast and respecting the shape of the CMUTs, which makes it possible to design robust faulty CMUT automatic identification algorithms. Scanning electron microscopy has been performed in order to check the reliability the detection of the non-hermetic CMUTs. Observations confirmed the reliability of the method

Synthèse et coordination d'un nouveau ligand hybride P,N

Communication orale intitulée : Synthèse et coordination d'un nouveau ligand hybride P,

Real-time detection of formaldehyde by a sensor

International audienceA hand-held formaldehyde (HCHO) gas detector has been developed. This fluorescence-based system uses a standard microscope glass slide both as a transducer and a sensor. The detection of gaseous formaldehyde is performed using the well-known Sawicki reaction with Fluoral-P, a reagent present in the nanoporous thin film which allows a selective reaction with formaldehyde. The nanoporous film of hybrid organic-inorganic polymer, prepared via the sol-gel method, is coated on the microscope slide by spin-coating, enabling reproducible coatings of various shapes and thicknesses. Experiments were carried out in the laboratory to calibrate the instrument, with the objective to perform measurements indoor and outdoor. The real-time monitoring allows to detect formaldehyde pollution peaks

Redox behavior of a ferrocene monolayer on SiO2 obtained after click-coupling

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