Nanodevices
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Thermo-mechanical vibration analysis of annular and circular graphene sheet embedded in an elastic medium
In this study, the vibration behavior of annular and circular graphene sheet coupled with temperature change and under in-plane pre-stressed is studied. Influence of the surrounding elastic medium 011 the fundamental frequencies of the single-layered graphene sheets (SLGSs) is investigated. Both Winkler-type and Pasternak- type models are employed to simulat
Lat. Am. j. solids struct.. Publicado em: 2014-08
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2. Exact solution for thermo-mechanical vibration of orthotropic mono-layer graphene sheet embedded in an elastic medium
In this paper, the effect of the temperature change on the vibration frequency of mono-layer graphene sheet embedded in an elastic medium are studied. Using the nonlocal elasticity theory, the governing equations are derived for single-layered graphene sheets. Using Levy and Navier solutions, analytical frequency equations for single-layered graphene sheets
Lat. Am. j. solids struct.. Publicado em: 2014-05
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3. Femtosecond lasers for processing glassy and polymeric materials
Novel materials have been developed to meet the increasing mechanical, electrical and optical properties required for technological applications in different fields of sciences. Among the methods available for modifying and improving materials properties, femtosecond laser processing is a potential approach. Owing to its precise ablation and modification cap
Mat. Res.. Publicado em: 27/09/2013
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4. Nonlocal continuum mechanics formulation for axial, flexural, shear and contraction coupled wave propagation in single walled carbon nanotubes
This paper presents the effect of nonlocal scaling parameter on the coupled i.e., axial, flexural, shear and contraction, wave propagation in single-walled carbon nanotubes (SWCNTs). The axial and transverse motion of SWCNT is modeled based on first order shear deformation theory (FSDT) and thickness contraction. The governing equations are derived based on
Lat. Am. j. solids struct.. Publicado em: 2012-08
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5. Torsional vibration of carbon nanotubes under initial compression stress
This study examines torsional vibration of Single-walled carbon nanotubes (SWCNTs) subjected to initial compression stresses. The nanotube structures are treated within the multilayer thin shell approximation with the elastic properties taken to be those of the graphene sheet. Simplified Flügge shell equations of motion are proposed as the governing equatio
Brazilian Journal of Physics. Publicado em: 2010-09
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6. Implantação iônica de baixa energia em polímero para desenvolvimento de camadas compósitas nanoestruturadas condutoras litografáveis. / Low energy ion implantation into polymers to develop conductive composite layers for lithography.
Electronics using polymers instead of silicon is a recent research area with promising economic perspectives. Polymer with metallic particles composites presents interesting electrical, magnetic and optical properties and they have been produced by a broad variety of techniques. Metal ion implantation using plasma is one of the used methods to obtain conduct
Publicado em: 2010
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7. Estruturas de teste para avaliação de variabilidade estatística em MOSFETs sub-100nm / Test structures for statistical variability evaluation on ultra-deep submicron MOSFETs
As variações nas características elétricas de dispositivos MOS são uma preocupação muito importante no projeto, manufatura e operação de circuitos integrados (CIs). Com a redução contínua (escalamento) das dimensões na tecnologia CMOS, variabilidade de processo se tornou um grande problema, afetando o desempenho e o rendimento positivo na produ�
Publicado em: 2010
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8. Nanolitografia do silício utilizando o microscópio de força atômica / Silicon nanolithography using a atomic force microscope
The semiconductor industry is increasingly interested in the miniaturization of devices in the nanometer range. As the traditional techniques of lithography are reaching their limits growth the demand for new, including those that use equipment operating by probe, such as the atomic force microscope (AFM). One of the techniques that uses AFM on to produce na
Publicado em: 2009
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9. Materiais hÃbridos formados por nanofilmes moleculares depositados sobre nanofilmes metÃlicos produzidos por processo bottom-up em substratos vÃtreos para uso como parte ativa de nanodispositivos
In the present work we are investigating a hybrid systems formed by a thermally evaporated molecular nanofilm of rare earth complex over a metallic thin film obtained by a bottom-up process. To produce the new hybrid, we have deposited the photonic Eu(btfa)3bipy complex on a glassy substrate containing a silver nanostructured film formed by thermal reduction
Publicado em: 2008
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10. Nanoosciladores atomísticos de nanotubos de Carbono e de Nitreto de Boro / Atomistic nanooscillators of Carbon nanotubes and Boron Nitride
The Nanotechnology quickly advances to the development of new nanodevices. One of most important in the electronics is clocks that they synchronize the functioning of diverse devices in a determined circuit. In this work we study the development of nanooscillators based upon Carbon nanotubes and Boron-Nitride nanotubes. The atom that oscillates in the interi
Publicado em: 2007
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11. Local anodic oxidation (LAO) lithography of nanodevices by means of atomic force microscopy / Litografia por oxidação anodica seletiva de nanodispositivos atraves de microscopia de força atomica
A Oxidação anódica local em substratos tanto semicondutores quanto metálicos através do Microscópio de Força Atômica tem surgido ao longo dos últimos anos como uma das técnicas de litografia mais confiáveis e versáteis para a fabricação de dispositivos e estruturas em escala nanométrica. Embora aspectos fundamentais, como a dinâmica envolvida
Publicado em: 2006
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12. Estudo da evolução dinamica de nanofios de cobre e ouro / Study of dynamical evolution of cooper and gold
Metallic nanowires have been a subject of study for at least ½fteen years. The interest in these new materials is increasing continuously due to the possibility of using them as metallic contacts in electronic nanodevices. For example, between two tips of very thin nanowires, it is possible to insert small structures, such as carbon buckyballs or small orga
Publicado em: 2006