Enginyeria Electrònica i Biomèdica: Enviaments recents
Ara mostrant els elements 321-340 de 781
Sensitization of Er3+ emission at 1.5m (mu)m by Yb3+ in KYb(WO4)2 single crystals
We present our recent achievements in the growth and spectroscopic characterization of KYb(WO4)2 crystals doped with erbium ions ~hereafter KYbW:Er!. We grew single crystals of KYbW:Er at several erbium concentrations ...
Surface roughness in InGaAs Channels of HEMT devices depending on the growth temperature: strain induced or due to alloy decomposition
InAlAs/InGaAs/InP based high electron mobility transistor devices have been structurally and electrically characterized, using transmission electron microscopy and Raman spectroscopy and measuring Hall mobilities. The ...
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles.
Structural and magnetic properties of -Fe2O3 nanoparticles annealed at 200 and 250 °C have been studied by using high resolution transmission electron microscopy TEM, electron energy loss spectroscopy, x-ray diffraction, ...
Partial and perfect dislocation nucleation at the onset of stress relaxation in In0.60Ga0.40As active layers of high mobility transistors grown on InP
The morphology of compressive InxGa1−xAs/In0.52Al0.48As layers grown on (100)‐InP substrates by molecular beam epitaxy was observed by transmission electron microscopy. A preliminary analysis of the network of misfit ...
Structural and functional characterization of (110)-oriented epitaxial La2/3Ca1/3MnO3 electrodes and SrTiO3 tunnel barriers
La2/3Ca1/3MnO3 (LCMO) films have been deposited on (110)-oriented SrTiO3 (STO) substrates. X-ray diffraction and high-resolution electron microscopy reveal that the (110) LCMO films are epitaxial and anisotropically in-plane ...
Copper (II) oxide nanowires for p-type conductometric NH3 sensing
Copper (II) oxide (CuO) is a metal oxide suitable for developing solid state gas sensors. Nevertheless, a detailed insight into the chemical-to-electrical transduction mechanisms between gas molecules and this metal oxide ...
Grape polyphenols decrease circulating branched chain amino acids in overfed adults
Introduction and aims: Dietary polyphenols have long been associated with health benefits, including the prevention of obesity and related chronic diseases. Overfeeding was shown to rapidly induce weight gain and fat mass, ...
Configurational statistical model for the damaged structure of silicon oxide after ion implantation
A configurational model for silicon oxide damaged after a high-dose ion implantation of a nonreactive species is presented. Based on statistics of silicon-centered tetrahedra, the model takes into account not only the ...
The role of energy correlations on Coulomb suppression in ballistic conductors contacted to degenerate reservoirs
Coulomb suppression of shot noise in a ballistic diode connected to degenerate ideal contacts is analyzed in terms of the correlations taking place between current fluctuations due to carriers injected with different ...
Ab initio study of NOx compounds adsorption on SnO2 surface
An ab initio study of the adsorption processes on NOx compounds on (1 1 0) SnO2 surface is presented with the aim of providing theoretical hints for the development of improved NOx gas sensors. From first principles ...
Gamification for Teaching Integrated Circuit Processing in an Introductory VLSI Design Course
Gamification is being incorporated into university classrooms due to its educational benefits for students learning, including encouraging student behavior and engagement, and consequently improving learning outcomes. ...
Competitive USB-Powered Hand-Held Potentiostat for POC Applications: An HRP Detection Case
Considerable efforts are made to develop Point-of-Care (POC) diagnostic tests. POC devices have the potential to match or surpass conventional systems regarding time, accuracy, and cost, and they are significantly easier ...
Strain-induced stabilization of new magnetic spinel structures in epitaxial oxide heterostructures.
We report here on the growth of NiFe2O4 epitaxial thin films of different thickness (3 nm ¿ t ¿ 32 nm) on single crystalline substrates having spinel (MgAl2O4) or perovskite (SrTiO3) structure. Ultrathin films, grown on ...
Influence of mismatch on the defects in relaxed epitaxial InGaAs/GaAs(100) films grown by molecular beam epitaxy
Thick (∼3 μm) films of InxGa1−xAs grown on GaAs(100) substrates, across the whole composition range, have been examined by transmission electron microscopy and double‐crystal x‐ray diffraction. The results were compared ...
Optical emission from SiO2-embedded silicon nanocrystals: a high pressure Raman and photoluminescence study
We investigate the optical properties of high-quality Si nanocrystals (NCs)/SiO2 multilayers under high hydrostatic pressure with Raman scattering and photoluminescence (PL) measurements. The aim of our study is to shed ...
Annealing kinetics of vacancy-related defects in low-dose MeV self-ion-implanted n-type silicon
Silicon samples of n-type have been implanted at room temperature with 5.6-MeV 28Si ions to a dose of 23108 cm22 and then annealed at temperatures from 100 to 380 °C. Both isothermal and isochronal treatments were performed ...
Ferromagnetism in transparent thin films of MgO
We show both theoretical and experimental evidences of the appearance of ferromagnetism in MgO thin films. First-principles calculations allow predicting the possibility of the formation of a local moment in MgO, provided ...
Producing 3D biomimetic nanomaterials for musculoskeletal system regeneration
The human musculoskeletal system is comprised mainly of connective tissues such as cartilage, tendon, ligaments, skeletal muscle, and skeletal bone. These tissues support the structure of the body, hold and protect the ...
Gradual transformation of Ag2S to Au2S nanoparticles by sequential cation exchange reactions: binary, ternary, and hybrid compositions
Cation exchange reactions have been exploited in the last years as an efficient tool for the controlled chemical modi-fication of pre-made nanocrystals. In this work, the gradual transformation of Ag2S nanocrystals into ...
Blue-green to near-IR switching electroluminescence from Si-rich silicon oxide/nitride bilayer structures
Blue green to near-IR switching electroluminescence (EL) has been achieved in a metal-oxide-semiconductor light emitting device, where the dielectric has been replaced by a Si-rich silicon oxide/nitride bilayer structure. ...
