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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2009.tde-03052010-100505
Document
Author
Full name
Leonardo Sabino dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Assali, Lucy Vitoria Credidio (President)
Miotto, Ronei
Petrilli, Helena Maria
Title in Portuguese
Um estudo ab-initio de propriedades estruturais e mecânicas de nanofios de óxido de magnésio
Keywords in Portuguese
Constante elástica
DFT
Física computacional
Física do estado sólido
Nanofios
Teoria do funcional da densidade
Abstract in Portuguese
Nanofios são estruturas em forma de fio com diâmetros da ordem de nanômetros. Estas estruturas têm sido bastante estudadas ultimamente, pois prometem aplicações tecnológicas na área de eletrônica e sensores. Neste trabalho, foram estudados nanofios finos de oxido de magnésio (MgO) com diâmetros de até 2 nm, utilizando cálculos ab-initio baseados na Teoria do Funcional da Densidade com uma base de ondas planas. No total foram estudados 12 fios, com diferentes tamanhos e formas. Entre os resultados obtidos, leis de escala são propostas para relacionar as propriedades dos nanofios com o inverso de seus perímetros. Além disso, verificamos que o módulo de elasticidade (ou módulo de Young) dos nanofios é muito maior que o do material sólido. Também construímos um modelo que relaciona a estabilidade dos nanofios com o número de vizinhos de cada átomo.
Title in English
An ab-initio study of the structural and mechanical properties of magnesium oxide nanowires
Keywords in English
Computational physics
Density functional theory
DFT
Elastic constant
Nanowires
Solid-state physics
Abstract in English
Nanowires are structures in the shape of wires with diameters on the order of nanometers. These structures have been widely studied recently, as they are promising candidates for technological applications in electronic components and sensors. In this work, we have studied very thin magnesium oxide (MgO) nanowires with diameters below 2 nm through Density Functional Theory-based ab-initio calculations with a plane wave basis set. A total of 12 nanowires of different sizes and shapes was studied. Among the obtained results, we have described scaling laws that relate the nanowire properties to the inverse of the wire perimeter. Moreover, we have found that the nanowires elasticity modulus (or Young modulus) is much larger than that of the solid material. We have also built a model that relates the stability of these nanowires to the number of neighbors of each atom.
 
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Publishing Date
2010-05-12
 
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