Naslov
Diluted magnetic semiconductors : Mn/Co-doped ZnO nanorods as case study

Autori
Djerdj, Igor ; Garnweitner, Georg ; Arčon, Denis ; Pregelj, Matej ; Jagličić, Zvonko ; Niederberger, Markus

Izvornik
Journal of Materials Chemistry (0959-9428) 18 (2008), 43; 5208-5217

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
doped ZnO; diluted magnetic semiconductors

Sažetak
The structure and the magnetic properties of 3 and 5 mol.% (based on the starting concentrations) Co and Mn-doped ZnO nanorods, synthesized by a straightforward and experimentally simple nonaqueous sol-gel route based on benzyl alcohol as solvent, have been investigated by various characterization techniques, including X-ray diffraction with Rietveld refinement, high-resolution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy, magnetization measurement and electron paramagnetic resonance. The doped as-synthesized ZnO nanocrystals retain the wurtzite structure with a morphology in the form of nanorods grown along the [001] direction, whose dimensional parameters as well as degree of agglomeration depend on the type and level of doping. The Co-doped ZnO powders are ferromagnetic with a Curie temperature exceeding room temperature. Conversely, the Mn-doped samples show antiferromagnetic correlations with a possible transition to an antiferromagnetic ground state below TN=10 K. The results thus suggest that the magnetic ground state is extremely sensitive to the type of dopant, which is in agreement with previous studies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA