Polymer Thin Films
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Análise fotocondutiva de estruturas fotovoltaicas baseadas em TiO2 e poli(3-hexiltiofeno) / Photoconductivity analysis of photovoltaic structures based on TiO2 and poly(3-hexylthiophene)
In this work we investigated electronic transport phenomena in an ITO/TiO2/RRP3HT/Al structure using photoconductivity spectral response when devices were illuminated either by the ITO electrode or by the aluminum. RRP3HT is the regioregular poly(3-hexylthiophene), a polymer that exhibits a relatively strong photovoltaic activity. RRP3HT were dissolved in a
Publicado em: 2009
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14. Silicon nanocrystals and zinc oxide nanowires with erbium / Nanocristais de silicio e nanofios de oxido de zinco com erbio
We present a study of erbium luminescence in silicon nanocrystals (nc-Si) and zinc oxide nanowires (nw-ZnO). Silicon nanocrystals are produced by annealing of amorphous sub-oxide thin films (SiOx) prepared by rf-sputtering varying the oxygen and erbium concentration during growth. Erbium is added by partially covering the silicon target surface with small pi
Publicado em: 2009
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15. LIMITES OPERACIONAIS DO PROCESSO DE REVESTIMENTO POR CORTINA / OPERABILITY LIMITS OF THE CURTAIN COATING PROCESS
Curtain coating is one the preferred methods for precision multi-layer coatings at high speeds. Curtain coating belongs to the class of premetered coating methods. Liquid falls as a sheet, or curtain, freely over a considerable height and under the action of gravity before it impinges onto the substrate being coated. Edge guide are needed to maintain at spec
Publicado em: 2009
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16. Fabricação e caracterização de dispositivos poliméricos emissores de luz com camada ativa de poli(2-metóxi, 5-(2-etil-hexilóxi)-1,4-fenileno vinileno) (MEH-PPV) / Fabrication and characterization of polymer light-emitting diodes with active layer composed by poly(2-methoxy, 5-(2-etil-hexilhoxy)-1,4-phenilene vinilene) (MEH-PPV).
Polymer light emitting diodes (PLEDs) have been widely investigated as candidate materials for display fabrication. The main advantages exhibited by PLEDs are the low-cost processing and possibility of large-area display fabrication, in comparison to the conventional liquid crystal displays (LCDs). Although the engineering aspects concerning device fabricati
Publicado em: 2008
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17. Modificações induzidas por ions de alta energia em filmes finos de organosilicones sintetizados por PECVD / Modifications induced by high energy ions in organosilicones thin films syntesized by PECVD
Thin films of polysiloxanes, polysilazanes and polycarbosilanes, synthesized by Plasma Enhanced Chemical Vapor Deposition (PECVD), were irradiated with 170 keV He + , Ne + , Ar + and Kr + ions, at 170 keV at fluences of 1x10 14 , 5 x10 14 , 1x10 15 , 5x10 15 and 1 x10 16 ions/cm -2 . The irradiation promoted significant modifications in the atomic compositio
Publicado em: 2007
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18. Modifications induced by high energy ions in organosilicones thin films syntesized by PECVD / Modificações induzidas por ions de alta energia em filmes finos de organosilicones sintetizados por PECVD
Thin films of polysiloxanes, polysilazanes and polycarbosilanes, synthesized by Plasma Enhanced Chemical Vapor Deposition (PECVD), were irradiated with 170 keV He + , Ne + , Ar + and Kr + ions, at 170 keV at fluences of 1x10 14 , 5 x10 14 , 1x10 15 , 5x10 15 and 1 x10 16 ions/cm -2 . The irradiation promoted significant modifications in the atomic compositio
Publicado em: 2007
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19. Nanoparticle self-assembly using patterns formed by dewetting / Auto-organização de nanoparticulas utilizando padrões formados por transição de molhabilidade
In this work, we study an original method to promote self-assembly of gold and silica nanoparticles using patterns formed by dewetting of aqueous solutions of poly (N-isopropylacrylamide) (PNIPAM) and sodium dodecylsulfate (SDS). Dewetting is a process where the free surface of an initially stable thin liquid film becomes unstable and deforms to engender rup
Publicado em: 2007
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20. Study of charge transport layers in polymer light emitting diodes. / Estudo de camadas transportadoras de cargas em diodos emissores de luz poliméricos.
In the present work, the study of the optical and electrical properties of polymeric electroluminescent devices known as Polymer Light-Emitting Diodes (PLEDs) and the development of Hole Transport Layers (HTLs) to promote an increase of the electrical efficiency of the devices was performed. PLEDs were constructed with structures like Anode/HTL/Electrolumine
Publicado em: 2007
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21. Desenvolvimento de processos de deposição de filmes filmes sobre substratos polimericos fotopolimerizdos / Development of process of deposition of thin films on photopolymerization polymeric substrats
A new era has begun all around the world. The quality of life and health depends more and more on the human capacity of resolving problems that are becoming longer and more complex day by day. As communication and globalization advance, time becomes scarcer and more precious. The semiconductor materials which are used to activate the logical functions, the h
Publicado em: 2007
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22. Estudo da interaÃÃo entre compostos orgÃnicos volÃteis e filme finos de polipirrol
Conducting polymers can be used as active materials of sensing devices that find application in different areas, such as quality control of products in industries such as food and beverage, cosmetics and solvents, in the monitoring of air quality for environmental and safety purposes, and as an auxiliary tool in the diagnosis of diseases. In spite of this, a
Publicado em: 2007
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23. Characterization of CdTe thin films grown on glass by hot wall epitaxy
In this work we have investigated the properties of CdTe thin films grown on glass substrates by Hot Wall Epitaxy. Its most important feature is the growth at very low temperatures, which would allow the growth even on polymer substrates. Our samples were grown at temperatures between 150 and 250 ºC at a growth rate between 0.2 and 2 µm/h. The CdTe films w
Brazilian Journal of Physics. Publicado em: 2006-06
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24. Estudo da orientação molecular em filmes automontados de azopolímeros por meio da técnica de geração de segundo harmônico (SHG) / Molecular orientation in self-assembled azo-polymer thin films studied by second harmonic generation (SHG).
Ultrathin films of polymers containing azochromophores are important for many applications such as optical data storage, formation of surface relief gratings, liquid crystal alignment layers and non-linear optical devices. Among several techniques for fabricating organic thin films, the Layer-By-Layer electrostatic self-assembly (LBL) is very attractive due
Publicado em: 2006