| Autor: |
Kostopoulou, Athanasia, Thétiot, Franck, Tsiaoussis, Ioannis, Androulidaki, Maria, Cozzoli, P. Davide, Lappas, Alexandros |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Chem. Mater. 24, 2722 (2012) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/cm3008182 |
| Popis: |
Hybrid nanocrystals (HNCs), based on ZnO nanorods (NRs) decorated with magnetic Fe-based domains, were synthesized via a colloidal seeded-growth method. The approach involved heterogeneous nucleation of Fe nanocrystals on size-tailored ZnO nanorod seeds in a noncoordinating solvent, followed by partial surface oxidation of the former to the corresponding Fe@FexOy core@shell domains. HNCs with variable population and size of the Fe-based nanodomains could be synthesized depending on the surface reactivity of the ZnO seeds. The structure-property relationships in these HNCs were carefully studied. In HNCs characterized by a large number of small Fe@FexOy core@shell nanodomains on the ZnO seed surface, the interfacial communication across the Fe-core and FexOy-shell generated a sizeable exchange-bias effect mediated by frozen interfacial spins. On the other hand, in HNCs carrying a lower density of comparatively larger Fe@FexOy domains, partial removal of the Fe core created an inner void in-between that led to suppressed exchange coupling anisotropy. As a further proof of functionality, the HNCs exhibited pronounced band-edge ultraviolet fluorescence. The latter was blue-shifted compared to the parent ZnO NRs, inferring coupling of the semiconductor and magnet sections. |
| Databáze: |
arXiv |
| Externí odkaz: |
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