Defect ferromagnetism in SnO2: Zn2+ hierarchical nanostructures: correlation between structural, electronic and magnetic properties
| Autor: | S. Akbar, Naveed Zafar Ali, S. K. Hasanain, Oleksii Ivashenko, Petra Rudolf, M. V. Dutka, Naureen Akhtar, J.Th.M. De Hosson |
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| Přispěvatelé: | Surfaces and Thin Films |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Free electron model
Materials science Nanostructure SURFACE FACILE SYNTHESIS General Chemical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry OXIDATION 01 natural sciences Oxygen Paramagnetism Vacancy defect NANOPARTICLES Condensed matter physics 1ST-PRINCIPLES ORIGIN ZN-DOPED SNO2 General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences SPHERES ROOM-TEMPERATURE FERROMAGNETISM chemistry Ferromagnetism GROWTH 0210 nano-technology |
| Zdroj: | RSC Advances, 9(7), 4082-4091. ROYAL SOC CHEMISTRY |
| ISSN: | 2046-2069 |
| Popis: | We report on the ferromagnetism of Sn1-xZnxO2 (x < 0.1) hierarchical nanostructures with various morphologies synthesized by a solvothermal route. A room temperature ferromagnetic and paramagnetic response was observed for all compositions, with a maximum in ferromagnetism for x = 0.04. The ferromagnetic behaviour was found to correlate with the presence of zinc on substitutional Sn sites and with a low oxygen vacancy concentration in the samples. The morphology of the nanostructures varied with zinc concentration. The strongest ferromagnetic response was observed in nanostructures with well-formed shapes, having nanoneedles on their surfaces. These nanoneedles consist of (110) and (101) planes, which are understood to be important in stabilizing the ferromagnetic defects. At higher zinc concentration the nanostructures become eroded and agglomerated, a phenomenon accompanied with a strong decrease in their ferromagnetic response. The observed trends are explained in the light of recent computational studies that discuss the relative stability of ferromagnetic defects on various surfaces and the role of oxygen vacancies in degradingferromagnetism via an increase in free electron concentration. |
| Databáze: | OpenAIRE |
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