Semiconductor Nanoparticles
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Precipitação seletiva de tamanhos em nanopartículas semicondutoras coloidais de CdTe e CdSe: um estudo por espectroscopia UV-VIS
The post-preparative size-selective precipitation technique was applied in CdTe and CdSe semiconductor nanocrystals prepared via colloidal route in water. The synthesis of CdTe and CdSe nanoparticles and the effect of the post-preparative size-selective precipitation have been characterized mainly by mean of ultraviolet and visible absorption spectroscopy (U
Química Nova. Publicado em: 2011
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14. Vidros de germanato com nanopartículas metálicas e semicondutoras dopados com terras-raras para aplicações em fotônica. / Germanate glasses containing metalic an semiconductor nanoparticles dopes with rare-earth ions for photonic aplicattions.
This work presents a spectroscopic study about Eu3+, Nd3+ and Er3+ rare-earth doped germanate glasses containing metallic and semiconductor nanoparticles (NPs) aiming the development of new materials for photonic applications. These glasses have a large transmission window (400-4500 nm), high refractive index (~ 1.9), low phonon energy (700 cm-1), high mecha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/09/2010
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15. O estado da arte da síntese de semicondutores nanocristalinos coloidais
Colloidal semiconductor nanocrystals, also known as quantum dots, have attracted great attention since they have interesting size-dependent properties due to the quantum confinement effect. These nanoparticles are highly luminescent and have potential applications in different technological areas, including biological labeling, light-emitting diodes and phot
Química Nova. Publicado em: 2010
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16. Estudo estrutural de nanossistemas semicondudores e semicondutores implantados por difração de raios-X de n-feixes / Structural study of semiconductors nanosystems and implanted semiconductors by means of n-beams X-ray diffraction
In this paper, X-ray multiple diffraction (MD) associated with the advantages of synchrotron radiation appears as a high-resolution microprobe and it is used to obtain relevant contributions to the study of structural properties of semiconductor materials, as they present themselves nanosystems epitaxial or implanted with ions. The study and detection of neg
Publicado em: 2010
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17. Influence of drying on the characteristics of zinc oxide nanoparticles
The recent growth in the field of porous and nanometric materials prepared by non-conventional processes has stimulated the search of new applications of ZnO nanoparticulate. Zinc oxide is an interesting semiconductor material due to its application on solar cells, gas sensors, ceramics, catalysts, cosmetics and varistors. In this work, the precipitation met
Brazilian Journal of Physics. Publicado em: 2009-04
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18. CaracterizaÃÃo Ãptica de materiais nanoestruturados por tÃcnicas de geraÃÃo de segundo e terceiro harmÃnico
This work is dedicated to the optical characterization of nanostructured materials that are of interest for non-linear optics, optoelectronics and nanophotonics. The hyper- Rayleigh scattering (HRS) technique and the third harmonic generation (THG) technique were used. The materials investigated were a glass-ceramics containing sodium niobate (NaNbO3) nanocr
Publicado em: 2007
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19. SÃntese e caracterizaÃÃo de nanocristais luminescentes baseados em semicondutores II-VI para fins de aplicaÃÃo como biomarcadores
In this work we present synthetic procedures in aqueous medium for the obtention of luminescent II-VI (CdS/Cd(OH)2 and CdTe/CdS) semiconductor nanocrystals. These methodologies, based on colloidal chemistry, resulted in particles with a size average of 8,5 nm for the CdS/Cd(OH)2 system and 3,8 nm for the CdTe/CdS system. The optical properties of these mater
Publicado em: 2006
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20. SÃntese e caracterizaÃÃo de nanopartÃculas de sulfeto de cÃdmio: aplicaÃÃes biomÃdicas
Nos Ãltimos anos, os efeitos de confinamento quÃntico em nanocristais semicondutores (pontos quÃnticos) tÃm atraÃdo bastante interesse devido Ãs suas novas propriedades Ãpticas e tambÃm ao grande potencial para aplicaÃÃes em sistemas biolÃgicos. Neste trabalho utilizamos pontos quÃnticos como marcadores fluorescentes em amostras biolÃgicas. Adap
Publicado em: 2006
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21. Obtenção e caracterização de materiais dopados SiO2-CdSe a partir de sonogeis de silica
The sol-gel process has proved to be extremely interesting in the production of new materiaIs. This is clearly indicated by the great number of publications in this area in the last decade. The possibility of obtaining monolithic solid materials and also powders, films and fibers from a liquid mixture of components at room temperature via aggregation and pol
Publicado em: 1994
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22. Nanocrystal targeting in vivo
Inorganic nanostructures that interface with biological systems have recently attracted widespread interest in biology and medicine. Nanoparticles are thought to have potential as novel intravascular probes for both diagnostic (e.g., imaging) and therapeutic purposes (e.g., drug delivery). Critical issues for successful nanoparticle delivery include the abil
The National Academy of Sciences.