Efecto del contenido de cobalto en la absorbancia óptica, fotoluminiscencia y estructura cristalina del ZnO Nanoestructurado

• Autor: Dobbertin Sánchez, Segundo Enrique
• Formato: tesis de grado
• Fecha de Publicación: 2015
• Institución: Universidad Nacional de Trujillo
• Repositorio: UNITRU-Tesis
• Lenguaje: español
• OAI Identifier: oai:dspace.unitru.edu.pe:20.500.14414/8158
• Enlace del recurso: https://hdl.handle.net/20.500.14414/8158
• Nivel de acceso: acceso abierto
• Materia: Absorbancia óptica, Fotoluminiscencia, Nanoestructurado, Estructura Cristalina del ZnO

By a modified sol-gel method, from ethanolic solutions, Zn1-xCoxO nanoparticles have_x000D_ been synthesized. The effect of cobalt content in the crystal structure, wide band gap,_x000D_ and luminescence of ZnO nanoparticles have been observed. The immediate qualitative_x000D_ effect was the greenish hue of the final product obtained, which was more intense as_x000D_ cobalt percentage increased. The optical absorbance analysis by UV-vis spectroscopy_x000D_ showed three characteristic bands assigned to cobalt ion, which indicates the effective_x000D_ incorporation of ion dopants in the crystal structure of the ZnO host. The excitonic_x000D_ nature of the nanoparticles was clearly detected. However, in general, a redshift of the_x000D_ energy band gap as the cobalt content increasing was observed. By Photoluminescence_x000D_ spectroscopy, at room temperature, two emission bands were evidenced for the pure_x000D_ ZnO nanoparticles. The first one was observed at UV range, and the other is a broad_x000D_ band around to 533nm related to defects, which is quenched in the Co-doped ZnO_x000D_ nanoparticles. The X-ray diffractograms showed the formation of the peaks_x000D_ corresponding to the hexagonal structure of ZnO