Structural and optical properties of ZnO and manganese-doped ZnO
| Autor: | María Victoria Gallegos, Miguel Andrés Peluso, Horacio J. Thomas, Laura Cristina Damonte, Jorge Enrique Sambeth |
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| Rok vydání: | 2016 |
| Předmět: |
optical properties
Recubrimientos y Películas Materials science Analytical chemistry chemistry.chemical_element INGENIERÍAS Y TECNOLOGÍAS 02 engineering and technology Manganese Mn - ZnO 010402 general chemistry 01 natural sciences Ingeniería de los Materiales XPS Materials Chemistry structural properties Structural properties Optical properties Mechanical Engineering Doping Metals and Alloys Química 021001 nanoscience & nanotechnology Mn- ZnO 0104 chemical sciences Band Gap Energy purl.org/becyt/ford/2 [https] chemistry Mechanics of Materials Band gap energy purl.org/becyt/ford/2.5 [https] 0210 nano-technology Nuclear chemistry |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.07.283 |
| Popis: | The structural, morphological and optical properties of manganese oxides supported on commercial ZnO,prepared by impregnation with manganese nitrate, were investigated. The nominal compositions of Mnin the samples were 5, 10, 15 and 20%w/w.The X-ray diffraction (XRD) experiments revealed the presenceof the ZnO wurtzite phase in all the samples, and ZnMnO3 was also found in the samples with 15 wt% and20 wt% of Mn. X-ray photoelectron spectroscopy (XPS) showed the presence of Mn2þ and Mn4þ in thexMnZnO samples. The results showed that the Mn2þ ions had substituted the Zn2þ ions without changing the wurtzite structure of ZnO, while Mn4þ might be assigned to the ZnMnO3 impurity phase.The optical band gap was found to be 3.3 eV for undoped ZnO samples and 3.10 eV for Mn-doped samples. The lattice defect distribution was investigated using the positron annihilation method. The results revealed that the average lifetime is a function of the Mn concentration and the formation of theZnMnO3 phase. Centro de Investigación y Desarrollo en Ciencias Aplicadas Instituto de Física La Plata Laboratorio de Servicios a la Industria y al Sistema Científico |
| Databáze: | OpenAIRE |
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