Electronic Transport
Mostrando 13-24 de 125 artigos, teses e dissertações.
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13. Simulações de sensores de gás nanoscópicos baseados em nanotubos de carbono: estrutura eletrônica e transporte de elétrons / Computational simulations of nanoscopic gas sensors based on carbon nanotubes: electronic structure and electronic transport
Since their discovery by S. Iijima in 1991, carbon nanotubes have been considered as one of the most promising nanostructured materials for the development of new nanoscopic electronic devices. Due to its high surface area to volume ratio, this material stands out as a candidate for possible gas sensoring applications. In this thesis, we have studied, by mea
Publicado em: 2011
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14. Generación de estados superficiales durante la formación electroforética catódica de películas de TiO2 sobre ito
In the present work TiO2 films were formed over Indium Tin Oxide (ITO) employing cathodic electrophoretic deposition (Cathodic-EPD) and Dr. Blade Technique. The films were characterized by electrochemical techniques in order to compare their electronic properties; as well as, their photoelectrochemical behavior. The electrochemical performance showed by the
Química Nova. Publicado em: 2011
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15. Transporte e estados confinados de portadores de carga em nanoestruturas de grafeno / Transport and Confined States of charge carriers in Graphene Nanostructures
In this work we investigate the behavior of charge carriers in a graphene sheet subjected to a one-dimensional electrostatic potential U(x). At first we consider two coupled quantum wells potential. For this structure we calculate the energy spectrum for the bound states, as well as the probability density behavior for some particular states. Some results fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2010
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16. Hot electron transport properties in characteristics of wurtzite GaN MESFETs using a five-valley model
Ensemble Monte Carlo simulations have been carried out to investigate the effects of upper valleys on the characteristics of wurtzite GaN MESFETs. Electronic states within the conduction band valleys at the Γ1, U, M, Γ3 and K are represented by non-parabolic ellipsoidal valleys centred on important symmetry points of the Brillouin zone. The following scatt
Brazilian Journal of Physics. Publicado em: 2010-09
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17. Aspectos eletrônicos e estruturais do grafeno e derivados:: um estudo teórico-experimental
In this work we study the electronic and structural properties of graphene and graphene based materials by means of experimental and theoretical techniques. By means of ab-initio calculations using the Density Funcional Theory (DFT), we study the effect of pressure on graphene multi-layers. We look for an explanation for experimental results on the charge in
Publicado em: 2010
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18. Estudo das propriedades termoelétricas de fios quânticos de telureto de chumbo / Study of thermoelectrical properties in lead telluride quantum wires
This work presents a theoretical study of the electronic and thermoelectric properties of PbTe quantum wires. Thermoelectric effects in nanostructured materials of IV-VI family, in particular superlattices, quantum well and quantum wire, have been studied a lot, because they present an enhancement in figure of merit relatively to bulk. Researching theoretica
Publicado em: 2010
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19. Development of an Acquisition System and Data Analysis for Measurements of Electron Transport Parameters in Gases / Desenvolvimento de sistema de aquisição e tratamento de dados para medidas de parâmetros de transporte de elétrons em gases
This thesis describes a pulsed Townsend experiment whose purpose was to obtain experimentally the transport parameters of electron in gases, particularly nitrogen and isobutane, within a range of reduced electric field between 130 Td and 210 Td. The transport parameters obtained were the average speed of center of mass of the electron cloud, the ionization r
Publicado em: 2010
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20. Propriedades eletrônicas e processos de transporte em materiais semicondutores nano-estruturados / Electronic properties and transport processes in nano-structured semiconductor materials
Os mecanismos de confinamento e transporte em escala nanométrica continuam a ser um desafio em Física do Estado Sólido, uma vez que tanto a dimensionalidade quanto o tamanho dos dispositivos continuam a ser reduzidos. Desta forma, o estudo e entendimento do transporte em materiais amorfos e nano-cristalinos, que apresentam acoplamento de processos de tran
Publicado em: 2010
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21. Andreev transport in double quantum dots coupled to superconductor and ferromagnetic leads / Transporte por reflexão de Andreev em pontos quanticos duplos acoplados a eletrodos supercondutores e ferromagneticos
In this work we studied the quantum transport in two hybrid nanostructures composed of double quantum dots (DQD)s coupled to superconductor (S) and ferromagnetic (F) leads. The first nanostructure, denoted by F - QDa - QDb - S, is composed of a ferromagnet, two quantum dots, and a superconductor connected in series. In the second nanostructure, denoted by (
Publicado em: 2010
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22. Desenvolvimento de uma metodologia de fabricação de transistores de filmes finos orgânicos. / Development of a manufacturing methodology for organic thin film transistors.
In this work, it is presented a methodology for organic thin-film transistor (OTFT) fabrication. Poly(3-hexylthyophene) (P3HT):[6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) bulk heterojunction solar cells were studied for their maximum power conversion efficiency (PCE) around 5 %. Efficiencies evolution in time from 10-6 to 1.7 % show the difficulties inv
Publicado em: 2010
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23. AnÃlise das CondiÃÃes de SeguranÃa ViÃria para os Pedestres em SemÃforos Providos de Equipamentos de FiscalizaÃÃo EletrÃnica - o Caso da Cidade de Fortaleza-Ce / ANALYSIS OF TERMS OF SAFETY FOR PEDESTRIANS IN TRAFFIC LIGHT PROVIDED FOR ELECTRONIC MONITORING EQUIPMENT - THE CASE OF THE CITY OF FORTALEZA - CE
O crescente envolvimento dos pedestres nos acidentes de trÃnsito aliado ao desrespeito dos motoristas frente a algumas medidas de engenharia para reduzir os acidentes envolvendo, principalmente, os pedestres, tem sido cada vez maior. Diante de tal contexto, uma das medidas empregadas pelo ÃrgÃos de trÃnsito para coibir os desrespeitos praticados, vÃm se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2009
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24. Substituição do sincronismo mecânico por sincronismo eletrônico das correias e esteiras de envernizadeiras e impressoras litográficas de folhas metálicas
In the print industry for several segments and a segment of this is on printed sheet metal. This segment is the preparation of steel plates for the manufacture of cans of industry both for domestic use, as industrial. The treatment of steel is based on the application of varnishes and paints that protect the metal against rust and assists in the decoration a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2009