| Revista: | Superficies y vacío |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000405032 |
| ISSN: | 1665-3521 |
| Autores: | Huang, W1 Shi, J1 Arizpe Chavez, H2 Zayas, María Elena2 Ma, G3 Espinoza Beltrán, F.J4 |
| Instituciones: | 1Chinese Academy of Sciences, Shanghai Institute of Ceramics, Shanghai. China 2Universidad de Sonora, Departamento de Investigación en Física, Hermosillo, Sonora. México 3Fudan University, Department of Physics, Shanghai. China 4Instituto Politécnico Nacional, Centro de Investigación y de Estudios Avanzados, Querétaro. México |
| Año: | 2004 |
| Periodo: | Mar |
| Volumen: | 17 |
| Número: | 1 |
| Paginación: | 13-16 |
| País: | México |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico |
| Resumen en inglés | Au-ZrO2 thin film samples of around 150 nm thick were prepared by means of sol-gel and dip-dry techniques on glass substrates, from a transparent sol containing ZrOCl2 and HAuCl4. After drying, solid films were obtained. TEM studies showed Au nanoparticles embedded in our films, with sizes in the range from 5 to 20 nm. Also, X-ray diffraction patterns showed Au diffraction peaks corresponding to metallic nanoparticles with sizes in the same range, as calculated from the Debye-Scherrer broadening formula. We also studied the optical absorption of our samples. Optical absorption spectra, shown as a surface plasmon resonance band (SPR), displays a shifting of the SPR peaks for our samples, in two opposite directions, depending on the initial treatment. It is showed as a red shifting for thermally treated samples and a blue shifting for samples with larger Au content. This opposite behavior, and some other possible effects as they could be larger nonlinear optical responses, can be attributed to several possible mechanisms, which include changes in the dielectric constant of the media network. Our results have to be explained not only in terms of the particle size, but also in terms of changes in the dielectric constant of the surrounding media. By means of the Mie model for small colloidal spherical particles, we estimated the corrected refraction index for our films, which in turn, can shed light on our results |
| Disciplinas: | Física y astronomía, Ingeniería |
| Palabras clave: | Física de materia condensada, Ingeniería de materiales, Películas delgadas, Nanopartículas, Oro, Zirconia, Método sol-gel, Propiedades ópticas |
| Keyword: | Physics and astronomy, Engineering, Condensed matter physics, Materials engineering, Thin films, Nanoparticles, Gold, Zirconia, Sol-gel method, Optical properties |
| Texto completo: | Texto completo (Ver PDF) |
