Effect of dilute doping and non-equilibrium synthesis on the structural, luminescent and magnetic properties of nanocrystalline Zn1-xNixO (x = 0.0025 – 0.03)
| Autor: | E. Vasile, C. Negrila, G.E. Stan, Mihail Secu, V. Mihalache, V. Bercu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photoluminescence Mechanical Engineering Doping Analytical chemistry 02 engineering and technology Magnetic semiconductor 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material 0104 chemical sciences law.invention Ferromagnetism X-ray photoelectron spectroscopy Mechanics of Materials law General Materials Science Crystallite 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | Materials Research Bulletin. 115:37-48 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2019.03.001 |
| Popis: | We report on the influence of dilute doping combined with the processing conditions on the morphological, structural, chemical states, photoluminescence and magnetic properties of Zn1-xNixO nanopowders. Ni doping changes the ZnO powder morphology from randomly-aggregated nanocrystals to densely-packed nanocrystals arranged in columnar particles, modifies the high-energy-component of O1 s spectrum and increases the modified Auger parameter in XPS, enhances the blue photoluminescence (PL) emission, suppresses the green PL emission and the intensity of the g = 1.997 EPR signal. Ni-ZnO nanostructures show room-temperature ferromagnetism (implying they can serve as dilute magnetic semiconductors). The saturation magnetization, crystallite size and microstrain increase with the doping level; the c-axis constant and unit cell volume decrease, however, being unexpectedly higher with respect to a (reference) ZnO powder with a relaxed lattice. We demonstrate that the investigated properties were controlled by both (dilute) doping level and donor native defects produced by non-equilibrium (oxygen-deficiency and high rate of) ZnO formation. |
| Databáze: | OpenAIRE |
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