Photoconductivity studies of gold nanoparticles supported on amorphous and crystalline TiO2 matrix prepared by sol-gel method
Gold metallic nanoparticles embedded in amorphous and crystalline TiO 2 matrix as powders and films were synthesized by the sol–gel process at room temperature. The TiO 2 matrix was synthesized by using tetrabutyl orthotitanate as the inorganic precursor. The films were spin-coated on glass wafers....
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57030389004 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57030389004 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas sol gel Titania Keywords Gans theory |
| Sumario: | Gold metallic nanoparticles embedded in amorphous and crystalline TiO 2 matrix as powders and films were synthesized by the sol–gel process at room temperature. The TiO 2 matrix was synthesized by using tetrabutyl orthotitanate as the inorganic precursor. The films were spin-coated on glass wafers. The samples were annealed at at 100 ± C for 30 minutes and sintered at 520 ± C for 1 hour to generated anatase and rutile phases. The film shows a light blue colour. The amorphous film exhibits an absorption band at 568 nm. The crystalline film exhibit two absorption peaks located at around 402 (from TiO 2 matrix) and 651 nm is due to the surface plasmon resonance of the gold nanoparticles. The films were studied using X-ray diffraction, infrared spectroscopy, scanning electron microscopy, high resolution transmission electronic microscopy and UV-Vis absorption spectroscopy. Photoconductivity studies were performed on amorphous and crystalline TiO 2 /Au films. The experimental data were fitted with straight lines at darkness and under illumination at 515 nm and 645 nm. This indicates an ohmic behavior. Transport parameters were calculated. |
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