Enginyeria Electrònica i Biomèdica: Enviaments recents
Ara mostrant els elements 221-240 de 781
Localized self-heating in large arrays of 1D nanostructures
One dimensional (1D) nanostructures offer a promising path towards highly efficient heating and temperature control in integrated microsystems. The so called self-heating effect can be used to modulate the response of solid ...
Nanocharacterization of Soft Biological Samples in Shear Mode with Quartz Tuning Fork Probes
Quartz tuning forks are extremely good resonators and their use is growing in scanning probe microscopy. Nevertheless, only a few studies on soft biological samples have been reported using these probes. In this work, we ...
The polarimetric and helioseismic imager on solar orbiter
This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseismology instrument to observe the Sun from outside the Sun-Earth line. It is the key ...
Ba3Yb(BO3)3 single crystals. Growth and spectroscopic characterization
We obtained Ba3Yb(BO3)3 single crystals by the flux method with solutions of the BaB2O4Na2OYb2O3 system. The evolution of the cell parameters with temperature shows a slope change at temperatures near 873 K, which may ...
Enhanced photoelectrochemical glycerol oxidation with bismuth gradient BiVO4 photoanodes
In this work, we propose a novel strategy for synthesizing BiVO4 photoelectrodes for photocatalytic oxidation of glycerol. The two-step electrodeposition process of BiOI, followed by a thermal diffusion of vanadium, results ...
Low noise pixel detectors based on gated geiger mode avalanche photodiodes
The gated operation is proposed as an effective method to reduce the noise in pixel detectors based on Geiger mode avalanche photodiodes. A prototype with the sensor and the front-end electronics monolithically integrated ...
Dynamic range extension of SiPM detectors with the time-gated operation
The silicon photomultiplier (SiPM) is a novel detector technology that has undergone a fast development in the last few years, owing to its single-photon resolution and ultra-fast response time. However, the typical high ...
Measurement and simulation of anisotropy in the Infrared and Raman spectra of beta-FeSi2 single crystals
In this paper we show that the orthorhombic phase of FeSi2 (stable at room temperature) displays a sizable anisotropy in the infrared spectra, with minor effects in the Raman data too. This fact is not trivial at all, since ...
High quality InAlN single layers lattice-matched to GaN grown by molecular beam epitaxy
We report on properties of high quality 60 nm thick InAlN layers nearly in-plane lattice-matched to GaN, grown on c-plane GaN-on-sapphire templates by plasma-assisted molecular beam epitaxy. Excellent crystalline quality ...
Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes
The control of the morphology, as well as the physical and chemical properties, of nanopores is a key issue for many applications. Reducing pore size is important in nanopore-based sensing applications as it helps to ...
Precessed electron diffraction study of defects and strain in GaN nanowires fabricated by top-down etching
Gallium nitride (GaN) nanowires (NWs) have been fabricated by top-down etching from GaN heteroepitaxial films, which provides an accurate control of their position and dimensions. However, these NWs contain, similar to the ...
Highly sensitive SnO2 nanowire network gas sensors
In this work we present a methodology for the localized growth of nanowires on prespecified areas of microhotplates that allows to independently adjust the device's resistance and its response to the gas. This is achieved ...
Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
The development of efficient photoanodes that reduce external energy requirements for the electrochemical conversion of CO2 to formate is essential for the future implementation of this technology. In this work, we explore ...
Efficient energy transfer from Si clusters to Er3+ in complex silicate glasses
We present an extensive study of the structural and optical emission properties in aluminum silicates and soda-lime silicates codoped with Si nanoclusters (Si-nc) and Er. Si excess of 5 and 15¿at.¿% and Er concentrations ...
Evidence of a minoritary monoclinic LaNiO<sub>2.5</sub> phase in lanthanum nickelate thin films
LaNiO3 (LNO) thin films of 14 nm and 35 nm thicknesses grown epitaxially on LaAlO3 (LAO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) substrates are studied using High Resolution Transmission Electron Microscopy (HRTEM) and High ...
Direct Operando Visualization of Metal Support Interactions Induced by Hydrogen Spillover During CO2 Hydrogenation
The understanding of catalyst active sites is a fundamental challenge for the future rational design of optimized and bespoke catalysts. For instance, the partial reduction of Ce4+ surface sites to Ce3+ and the formation ...
Thin-Film Stabilization of a Ferroelectric Orthorhombic α Pr2WO6 Polymorph
A new orthorhombic α-Pr2WO6 (PrWO) polymorph with a = 16.57(5) Å, b = 5.52(5) Å and c= 8.73(1) Å, isostructural to α-La2WO6 and α-Nd2WO6, has been stabilized in the form of thin film by pulsed laser deposition on (001)-oriented ...
Chemical vapour deposited ZnO nanowires for detecting Ethanol and NO2
Randomly oriented ZnO nanowires were grown directly onto alumina substrates having platinum interdigitated screen-printed electrodes via the chemical vapor deposition method using Au as catalyst. Three different Au film ...
Direct Measurement of Oxygen Mass Transport at the Nanoscale
Tuning oxygen mass transport properties at the nanoscale offers a promising approach for developing high performing energy materials. A number of strategies for engineering interfaces with enhanced oxygen diffusivity and ...
Diffraction grating couplers milled in Si3N4 rib waveguides with a focused ion beam
Focused ion beam milling is a processing technology which allows flexible direct writing of nanometer scale features efficiently substituting electron beam lithography. No mask need results in ability for patterns writing ...
