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Ferromagnetism in ZnO Nanocrystals: Doping and Surface Chemistry
- Source :
- The Journal of Physical Chemistry C. 114:1451-1459
- Publication Year :
- 2010
- Publisher :
- American Chemical Society (ACS), 2010.
-
Abstract
- Room temperature ferromagnetic ordering is observed in chemically grown ZnO nanocrystals. Nanocrystals are simultaneously capped by two different organic molecules inducing p-type and n-type defects. A saturation magnetization of 0.008 emu/g is achieved at 300 K. Incorporation of Mn2+ ions at substitutional sites in nanocrystals gives rise higher saturation magnetic moment at lower doping level. ZnO nanocrystals codoped with Mn2+ and Co2+ and prepared under identical conditions revealed an increase in saturation magnetization. However, the saturation magnetic moment remains lower than that obtained for Co2+-doped ZnO nanocrystals prepared by the same method. An increase in saturation magnetization was invariably associated with quenching of photoluminescence emission. These findings reaffirm that magnetism in nanocrystals is a defect induced phenomenon that can be controlled by choice of capping agent as well as incorporation of the transition metal impurity. Magnetization as a function of temperature [M(...
- Subjects :
- Photoluminescence
Condensed Matter::Other
Magnetism
Chemistry
Doping
Nanotechnology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Magnetization
General Energy
Ferromagnetism
Nanocrystal
Transition metal
Impurity
Physics::Atomic and Molecular Clusters
Physical chemistry
Physical and Theoretical Chemistry
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 114
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........0db225a0d7ecc1d069e70e16f7c10611