João Ider

• PhD Student at Federal University of Itajubá

O primeiro material bidimensional descoberto foi o grafeno em 2004. A partir de então, estudos foram desenvolvidos com outros materiais e, um dos primeiros semicondutores a ser isolado foi o dissulfeto de molibdênio, o MoS2. Ao contrário do grafeno, o MoS2 tem gap de energia, e na forma de monocamada o gap passa de indireto para direto. Essa mudanç...

In this research, a Concentrated Solar Power (CSP) as a Parabolic Trough Collector (PTC), using Peltier cooling modules for power generation was analyzed by the Cross-Entropy method. When comparing conventional solar electric generators with this system, we have the advantage that it is compact and lightweight and can be easily assembled and used a...

The syntheses of TiO2 and Pd/TiO2 nanoparticles were carried by hydrolysis of alkoxide precursors using the reverse micelles method using titanium tetrabutoxide and palladium acetylacetonate as precursor metals. The method was modified by precipitation with the addition of n-butanol and then washed with an ethanol/water solution at a ratio of 1:1....

Due to the large reduction in fossil fuel reservoirs, the consequent cost increase of deepwater extraction, and the emission of pollutants, there is a constant search for alternative ways to obtain clean energy at a lower cost. Among those sources, we focus on the energy produced by thermoelectric materials. In this work, we present a new system fo...

In this work we developed a didactic linear parabolic solar concentrator for use with Peltier cooling modules for power generation. The main idea is to maximize the temperature gradient between the hot and cold sides to provide maximum power for this system and use that in class for experimental explanations. The cold temperature is provided by a f...

This manuscript presents the study of electronic transport on a set of five multilayer molecular beam epitaxy-grown InAs/GaAs semiconductor samples. We developed an automated switch system to carry out electronic transport measurements of mobility and carrier concentration using the van der Pauw technique. Measurements were carried out as a functio...

In this work the evolution of two fields of matter in planar symmetric black holes D-dimensional with symmetry of Lifshitz whose dynamic exponent is $z$ were analyzed. The fields investigated were a scalar field non-minimal coupled to the Einstein tensor and the Ricci scalar and the electromagnetic field. Two black holes were chosen, one with 5-dim...