A5051913976- Metal and Thin Film Mechanics
- ZnO doping and properties
- Diamond and Carbon-based Materials Research
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and devices
- Laser Material Processing Techniques
- Semiconductor materials and interfaces
- Boron and Carbon Nanomaterials Research
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Thin-Film Transistor Technologies
- Heusler alloys: electronic and magnetic properties
- Advanced Surface Polishing Techniques
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Laser-induced spectroscopy and plasma
- Gas Sensing Nanomaterials and Sensors
- Ion-surface interactions and analysis
- Nanowire Synthesis and Applications
- Surface Roughness and Optical Measurements
- Plasma Diagnostics and Applications
- Silicon and Solar Cell Technologies
- Magnetic Properties and Synthesis of Ferrites
University of Lisbon
2010-2022
Faculdade de Tecnologia e Ciências
2017
Instituto Politécnico de Lisboa
2017
Instituto Superior Técnico
1996
Chimie ParisTech
1980
Measurements of the sound velocity c in water, heavy and water–ethanol mixtures have been carried out a temperature range extending from room to supercooled region above -20 °C, by Brillouin light scattering technique. Pure H2O D2O show strong anomalous behavior which can be described critical laws. The addition ethanol water decreases importance anomalies, c(T) is no longer For some concentrations, minimum curve observed at low temperatures. adiabatic compressibility evaluated for all...
Abstract We measured the depolarized Rayleigh scattering of heavy water from 70°C down to -13°C. The spectra were analysed and show a low frequency component. Both intensity width this line are temperature dependent. characteristic time associated with has an Arrhenius behaviour activation energy 2·5 kcal mol-1. quadratic shape maximum around 50°C. interpret these results as manifestation hydrogen-bond dynamics propose mechanism for breaking H-bonds through librational movements. Comparisons...
Recent advances in vacuum sciences and applications are reviewed. Novel optical interferometer cavity devices enable pressure measurements with ppm accuracy. The innovative dynamic standard allows for temporal resolution of 2 ms. Vacuum issues the construction huge ultra-high worldwide surface science thin films include new phenomena observed electron transport near solid surfaces as well novel results on properties carbon nanomaterials. Precise techniques thin-film characterization have...
Here we study the resistive switching (RS) effect that emerges when ferroelectric BaTiO$_{3}$ (BTO) and few-layers MoSe$_{2}$ are combined in one single structure. The C-V loops reveal nature of both Al/Si/SiO$_{x}$/BTO/Au Al/Si/SiO$_{x}$/MoSe$_{2}$/BTO/Au structures high quality SiO$_{x}$/MoSe$_{2}$ interface Al/Si/SiOx/MoSe$_{2}$/Au hybrid show electroforming free is explained on basis modulation potential distribution at MoSe$_{2}$/BTO via polarization flipping. This structure shows...
Abstract This work reports the effect of different processing parameters on structural and morphological characteristics MoSe 2 layers grown by chemical vapour deposition (CVD), using MoO 3 Se powders as solid precursors. It shows strong dependence size, shape thickness parameters. The morphology samples was investigated field emission scanning electron microscopy (FESEM) deposited determined atomic force (AFM). Raman photoluminescence (PL) spectroscopies were used to confirm high quality...
A mathematical model for the concentration profile of TiCl4 at top surface an Incoloy 800H substrate placed inside a laser chemical vapor deposition (LCVD) reactor is developed by using three-dimensional transient mass diffusion equation. The used studying spatial variation thickness TiN dots deposited LCVD, CO2 and reactive atmosphere consisting TiCl4, N2, H2. By assuming that reaction first-order with respect to sticking coefficient temperature dependent, film found have volcanic under...
Here, we use Andreev reflection spectroscopy to study the spin polarization of high quality CrO2 films. We as a function growth temperature, resulting in grain size and electrical resistivity. In these films low temperature appears be necessary but not sufficient condition guarantee observation polarization, this is only observed conjunction with suppressed superconducting gap values anomalously interface properties. suggest that combination observations manifestation long range triplet...
The thermoelectric and transport properties of a Fe3O4/SiO2/p-Si(100) heterostructure have been investigated between 100 300 K. Both Hall Seebeck coefficients change sign from negative to positive with increasing temperature while the resistivity drops sharply due tunneling carriers into p-Si(100). low large coefficient Si give very high power factor 25.5 mW/K2m at 260 K which is an underestimated, lower limit value related density states difference in work functions Fe3O4 Si(100) that...