Síntesis de ZnO Nanoestructurado con Propiedades Luminiscentes

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Sonia Guaño

Patricia Fernández-Morales



Resumen

Resumen: En el presente trabajo se ha sintetizado óxido de zinc por evaporación, condensación y oxidación de Znmetálico a presión atmosférica en un reactor tubular de cuarzo a temperaturas entre 900 °C y 1100 °C, con unextremo que permita la inyección de argón y oxígeno para lograr cristales puros no dopados de ZnO, y paradeterminar su influencia en las características morfológicas y luminiscentes de las partículas sintetizadas. Se haencontrado predominancia de morfologías tipo tetrápodos con brazos piramidales y de dimensiones de pocascentenas de nanómetros hasta varias micras. Las partículas sintetizadas se caracterizaron mediante difracción derayos X (DRX), Microscopía Electrónica de Barrido (MEB), Microscopía Electrónica de Transmisión (MET), y suspropiedades ópticas se analizaron por catodoluminiscencia (CL) y fotoluminiscencia (PL). Las imágenesmonocromáticas adquiridas por catodoluminisciencia logran mostrar cuál región de las partículas es responsable delos picos de emisión, lo que permite focalizar el estudio en la emisión de interés.

Abstract: Zinc oxide is synthesized by evaporation, condensation and oxidation of Zn metal at atmosphericpressure in a quartz tubular reactor at temperatures between 900 °C and 1100 °C with one end that allows theinjection of argon and oxygen to achieve pure crystals undoped ZnO and determine the influence on themorphological and luminescent characteristics of the synthesized particles. It has been found predominance oftetrapod type with pyramidal morphologies and dimensions arms few hundred nanometers to several microns. Thesynthesized particles have been characterized by X ray diffraction (XRD), scanning electronic microscopy (SEM),transmission electronic microscopy (TEM) and its optical properties have been analyzed by cathodoluminescence(CL) and photoluminescence (PL). Monochrome images acquired by catodoluminiscence region may show whatparticles region are responsible for the emission peaks, allowing the study to focus on the issue of interest.

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