Abstract
Zinc Oxide (ZnO) has proven to be a very promising material for use in various electronic devices, for example in catalysis, chemical sensors, solar cells, the synthesis of methanol, photocatalysis, UV light emitting diodes, laser diodes and microsensors. In addition to ZnO bulk, the surfaces, applied to thin films and ZnO nanostructures are also being widely studied and used in electronic devices in general.In spite of the experimental studies carried out, the need for further theoretical study still remain, in particular the ZnO nanostructures, of both structural and electronic propertiesIn this project, a detailed study was developed of structural and electronic properties of the ZnO bulk, as well as of surfaces and nanotubes with ZnO/GaN interface, dopings (Manganese and Aluminum), variation of elastic and piezoelectric constants due to the pressure, and NH3 and CO adsorption on single-walled ZnO nanotubes. But despite the tests already carried out during the project, one analysis in particular would be a major contribution to this project: the topological analysisThe quantum theory in molecules - QTAIM, was developed by Professor Richard Bader, which provides an analysis of the electronic density along the bonding, core, ring and cages, where the critical points are (CP).Although studies have reported the topological analysis, most of them address the study of molecules, and few studies were carried out for crystalline systems, in particular for ZnO. For this reason, this project aims a detailed study of the topological analysis for single-walled nanotubes of ZnO with NH3 and CO adsorption, and also for structures with interfaces, in order to carry out further development about the behavior of connections and the electronic distribution of the material. At the end of this study, papers shall be written in order to scientifically contribute to the QTAIM analysis for crystalline structures in the solid state. (AU)
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