Browsing Departamento de Física | CN by Title
Now showing items 2-21 of 22
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Band Gap Engineering of ZnO by Alloying of MgO, BeO and TiO2 for UV Sensor Applications
ZnO-based alloys from II-VI semiconductors are considered to be a promising alternative to III-V nitrides for optoelectronic devices in the ultraviolet range as an alternative to the GaN material system. ZnO is a hard ... -
BLAST: A study of the Earliest Stages of High-Mass Star Formation in Cygnus X.
Stars form from the gravitational collapse of massive clouds of gas and dust in the interstellar medium. Although massive stars play an important role in determining the evolution of galaxies, our understanding of their ... -
Computational Design of Novel Nanocatalysts and Nanomaterials Towards Carbon Neutral Energy
In this dissertation, the computational design of novel nanocatalysts and nanomaterials towards neutral energy, including Mn-modified Rh(100) for syngas-ethanol conversion, Feanchored graphene oxide and single metal atom ... -
Development of Sensors Based on Advanced Micro- and Nano-Structured Carbon Materials
The thesis is focused on the development of sensors based on advanced micro- and nano-structured carbon materials. In particular, we developed prototype diamond-based ultraviolet photodetectors and carbon nanotubes-based ... -
Electrical Characterization of Al Doped ZnO Sol-gel Films
Thin films of transparent conductive oxides (TCO) are of interest as components in different applications such as transparent electrodes, solar panels as well as gas sensors. Interest in Aluminum doped zinc oxide thin films ... -
Electromechanical Photoemission and Field Emission Properties of Ultrananocystalline Diamond Films
Diamond materials have been the subject of intensive research for decades. Since the fabrication of diamond structures by chemical vapor deposition was demonstrated in the 1960’s, research and developments effor boomed. ... -
Influence of Confinement on Relaxation of Director Orientational Fluctuations in Nematic Liquid Crystal.
Dynamic light scattering (DLS) was applied to study the influence of confinement on dynamic properties of 4-methoxybenzylidene- 4- butylaniline (MBBA) nematic liquid crystal dispersed in random porous matrices with mean ... -
Investigations on Structural and Electrochemical Properties of Layered Composite Cathode Materials for Li Ion Batteries
Development of eco-friendly, low cost and high energy density cathode materials for Li ion battery is a challenge for the research community due to the urgent requirements for highly efficient energy storage devices in ... -
Mn-Based Nanostructured Building Blocks: Synthesis, Characterization and Applications
The quest for smaller functional elements of devices has stimulated increased interest in charge-transfer phenomena at the nanoscale. Mn-based nanostructured building blocks are particularly appealing given that the ... -
Nucleation, Growth, and Electrical Characterization of Al2O3 Thin Films Grown by Atomic Layer Deposition
Materials with higher dielectric constant than SiO2 (~ .4.0), called as high-k materials, are of great demand for CMOS transistors and DRAM capacitors. Aluminum oxide (Al2O3) has many interesting properties, such as high ... -
On the Properties of a Dimer Electrolyte in a Planar Electric Double Layer A Monte Carlo Simulation Study
The precise description of the double layer phenomenon at the interface region between a charged electrode and an ionic solution is nowadays, more than ever, of great importance in areas like capacitors design, metal ... -
Platinum Based Catalysts for the Electrochemical Oxidation of Ammonia, Ammonia Oxidation on the Ground Vs. Microgravity & the Electrochemical Ammonia Removal System
This project is about optimizing the electrochemical oxidation of ammonia. The goal is to enhance the electrochemical oxidation of ammonia by synthesizing platinum based catalysts and develop a Direct Ammonia Alkaline Fuel ... -
Preparation of Carbon-Platinum-Ceria and Carbon-Platinum-Cerium catalysts and its application in Polymer Electrolyte Fuel Cell: Hydrogen, Methanol, and Ethanol
This thesis is focused on fuel cells using hydrogen, methanol and ethanol as fuel. Also, in the method of preparation of catalytic material for the anode: Supercritical Fluid Deposition (SFD) and impregnation method using ... -
Studies of Surface-Modified Molybdenum Dioxide as Anode Material for Lithium-Ion Batteries
Lithium ion batteries have attracted much interest in the field of fundamental study and applied research, where the greatest challenge lies in the design and development of electrode materials with high power density and ... -
Studies on Pb Free Ferroelectric Materials for Photovoltaic Applications
Ferroelectrics have shown a promising alternative material system for photovoltaic applications. High open circuit voltages in ferroelectric thin films have generated considerable interest in the field of ferroelectric ... -
Study of Nanofibers Formed by Magnetic Field Assisted Electrospinning Using Solutions Containing PVDF, DMF, Acetone and Fe3O4 Nanoparticles
We present a comprehensive study on Polyvinylidene Fluoride (PVDF) nanofibers with solutions containing Fe3O4 nanoparticles (NPs). These fibers were formed by using an in house designed Magnetic Field Assisted Electrospinning ... -
Study of the Earliest Stages of Galactic Star Formation: BLAST Survey of the Vela Molecular Ridge.
Stars form from the gravitational collapse of dense clouds of gas and dust in the interstellar molecular medium. However, little is known about the origin and evolution of these early stages of star formation. In this ... -
Study of the Earliest Stages of High- Mass Star Formation through high-angular resolution spectral line observations.
Star formation is one of the most important research areas in modern astrophysics, and high-mass star formation, in particular, still presents unresolved questions. Stars form out of huge volumes of gas and dust, which ... -
Synthesis and Functionalization of Atomic Layer Boron Nitride Nanosheets for Advanced Material Applications
Besides graphene, hexagonal boron nitride nanosheets (BNNSs) are playing an excellent role for the next generation of 2-dimentional (2D) functional nanomaterials. Due to the similar lattice parameter and identical crystalline ... -
Synthesis of PZTFT and PZTFN, Two New Single Phase Magnetoelectric Multiferroic Materials at Room Tempeture for Multifunctional Applications
(2015-12-09)The anticipated end of Moore's law scaling in microelectronics has stimulated researchers to explore alternatives, i.e. to render the individual components multifunctional. One promising field on which the researchers have ...