Vapor Phase Deposition
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD
The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO2) films grown by metalorganic chemical vapor deposition (MOCVD) at 400 and 500 °C, in different growth times. The photocatalytic behavior was analyzed by measuring the methyl orange dye degradation at different pH values. Structural and morpholog
J. Braz. Chem. Soc.. Publicado em: 2020-06
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2. On the Effect of Aluminum on the Microstructure and Mechanical Properties of CrN Coatings deposited by HiPIMS
Hard coatings are a suitable solution for increasing the lifetime of tools and components employed in different industrial applications. Coatings of transition metal nitrides have great use for tribological applications due to due to their unique mechanical properties. Although widely employed, current deposition methods such as cathodic arc evaporation prod
Mat. Res.. Publicado em: 12/04/2018
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3. Synthesis and Microstructural Characterization of SnO2:F Thin Films Deposited by AACVD
In this work, we report the synthesis and microstructural characterization of Tin oxide thin films doped with fluorine for applications such as transparent conductive oxides. Tin oxide doped with fluorine thin films were deposited by aerosol assisted chemical vapor deposition technique onto a borosilicate glass substrate, using a precursor solution of stanni
Mat. Res.. Publicado em: 31/10/2016
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4. Optical Band Gap Estimation of ZnO Nanorods
Abstract The optical band gap energy of ZnO nanorods was estimated by different methods found in literature. These nanorods were deposited onto TiO2 covered borosilicate glass substrates by aerosol assisted chemical vapor deposition. Characterization techniques were employed to reveal the crystalline structure, surface morphology and optical properties of th
Mat. Res.. Publicado em: 28/07/2016
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5. Um novo método para síntese de vidros fotônicos baseado na sinergia entre as técnicas VAD e ALD / A new method for synthesis of photonic glasses based on the synergy between VAD and ALD techniques
This study aimed to establish a new method for synthesis of photonic glasses through the synergy of Vapor-phase Axial Deposition (VAD) and Atomic Layer Deposition (ALD) techniques. Having the intention to obtain a completely transparent material containing a uniform distribution of dopant element both radial and axial position. In the first stage of this stu
Publicado em: 2011
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6. Sintese de nanotubos de carbono por CVD utilizando catalisadores à base de ferro e molibdênio suportados em matrizes cerâmicas
Molybdenum is known for its synergistic effect in the synthesis of carbon nanotubes (CNs) by chemical vapor deposition (CVD method). When added to typical catalysts like iron, nickel, and cobalt, even in small quantities, it is increases the yield of these nanostructures. The presence of Mo also has an influence on the type and number of CN walls formed. Alt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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7. Thermal barrier coating by electron beam-physical vapor deposition of zirconia co-doped with yttria and niobia
Abstract: The most usual ceramic material for coating turbine blades is yttria doped zirconia. Addition of niobia, as a co-dopant in the Y2O3-ZrO2 system, can reduce the thermal conductivity and improve mechanical properties of the coating. The purpose of this work was to evaluate the influence of the addition of niobia on the microstructure and thermal prop
J. Aerosp. Technol. Manag.. Publicado em: 2010-08
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8. Estudo das propriedades estruturais e ópticas em materiais nanoestruturados a base de silício. / Study of structural and optical properties in nanostructured silicon based films.
The aim of this doctorate thesis is to enhance the knowledge in the research conducted along the Master degree based on the characterization and study of the structural and luminescent properties of silicon rich silicon oxynitride films (SiOxNy:H) deposited at low temperature by Plasma Enhanced Chemical Vapor Deposition (PECVD). The results of this study ind
Publicado em: 2009
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9. Filmes de diamante-CVD sobre substrato de titânio puro poroso: uma proposta para aplicação como eletrodo / CVD-diamond films on tridimentional porous pure titanium substrate: an electrode application proposal
A novel composite material formed from nanocrystalline and/or microcrystalline diamond films grown on pure porous titanium substrate was extensively studied taking into account their morphological, structural and electrochemical properties. The films were deposited by chemical vapor deposition technique, using a hot filament reactor, while the powder metallu
Publicado em: 2008
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10. Study of the fabrication steps of an electro-thermo-optical device using Mach-Zehnder interferometer. / Estudo das etapas de fabricação de dispositivos eletro-termo-ópticos utilizando o interferômetro Mach-Zehnder.
In this work, a study of the steps to fabricate an electro-thermo-optical device is realized. This device is based in a Mach-Zehnder interferometer (IMZ) where a micro-resistor is placed in one of the IMZ arms. The Mach-Zehnder interferometer was fabricated using Anti-Resonant Reflecting Optical Waveguide (ARROW) where oxinytride and amorphous hydrogenated s
Publicado em: 2008
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11. Nanofibras de carbono verticalmente alinhadas:: estudo do crescimento por microscopia eletrônica de transmissão
This work is about the growth of vertically aligned Carbon Nanofibers - CNFs - grown by Plasma Enhanced Chemical Vapour Deposition - PECVD. Being so, a detailed study of catalyst particle is necessary and Transmission Electron Microscopy - TEM - is fundamental for this knowledge. Some analytical techniques associated to TEM were used: Bright and Dark Field I
Publicado em: 2008
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12. Implementação de sensores ópticos integrados para aplicações em análises químicas e ambientais. / Implementation of integrated optical sensors for chemical analysis and environment aplications.
The aim of this work is the development of optical chemical sensors based on Mach-Zehnder Interferometer (MZI) for chemical and environmental analysis applications. Such devices were implemented with waveguides fabricated on a silicon substrate. The waveguides were obtained using silicon nitride (Si3N4) and silicon oxide (SiO2) films obtained by CVD (Chemica
Publicado em: 2007