In this work we present studies for the behavior of impurity breakdown of two GaAs samples grown by Molecular Beam Epitaxy at 200oC and 300oC. We vary the temperature and the illumination intensity. For the sample grown at 200oC, the transport mechanism after the breakdown is of the same type of the main free carriers at low electric elds. Below 100K, a clear dependence of the threshold electri...

Background: The “pasta” phase of nuclear matter may play an important role in the structure and evolution of neutron stars. Recent works suggest nuclear pasta has a high resistivity which could be explained by the presence of long-lived topological defects. The defects act as impurities that decrease thermal and electrical conductivity of the pasta. Purpose: To quantify how topological defects ...

Metal clusters exhibit unique size-dependent physical[1] and chemical properties[2] that differ from those of bulk materials. While inert as a bulk material, gold nanoparticles and clusters have attracted considerable interest lately as active catalysts for a number of industrially relevant reactions.[3–6] Unlike supported particles of larger size or extended solid surfaces,[7–10] size-selected...

The surfaces of most metals immersed in aqueous electrolytes have a several-nanometer-thick oxide/hydroxide surface layer. This gives rise to the existence both metal∣oxide and oxide∣liquid electrotlyte interfaces, makes it challenging correlate atomic length-scale structures with electrochemical properties such potential-of-zero-charge (PZC). PZC has been shown be correlated onset potential fo...

Electronic devices made from organic materials have the potential to support a more ecologically friendly and affordable future. However, the ability to fabricate devices with well-defined and reproducible electrical and optical properties is hindered by the sensitivity to the presence of chemical impurities. Oxygen in particular is an impurity that can trap electrons and modify conductive prop...

The molecular properties known to play an essential role in drug-receptor interaction of substructures models of bioactive molecules have been studied using chemical quantum calculations. 1,4-diformyl-piperazine and 1,4-dithionyl-piperazine have been used as models to probe conformational behaviors and some electronic properties of substructure of some tri-substituted piperazine showing dual an...

Photosensitization properties of coronene-purine (Cor-P) hybrids for photodynamic therapy (PDT) have been investigated in this work. Eight hybrid Cor-P models have been designed by the additional of adenine (A) and guanine (G) nucleobase to Cor species. The evaluated absorption and emission energies indicated that the singular models are not good at all for PDT process whereas their hybrid mode...

Iron oxide (Fe2O3) nanoparticles were synthesized by a simple approach using sodium borohydride (NaBH4) and Iron chloride hexahydrate (FeCl3.6H2O). Their physicochemical properties were characterized by high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS). XRD pattern showed that the iron...