Effect of organic capping on defect induced ferromagnetism in ZnO nanoparticles

We report the possibility of room temperature d0Dilute Magnetic Semiconductor (d0DMS) behavior in organic capped Zinc Oxide (ZnO) nanoparticles. The uncapped and organic capped ZnO nanoparticles were prepared through a simple chemical synthesis technique. Tri-n-Octyl Phosphine Oxide (TOPO) and Dodec...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2022-01, Vol.624, p.413379, Article 413379
Main Authors: K K, Nishad, Manthrammel, M. Aslam, Shkir, Mohd, AlFaify, S., Pandey, R.K.
Format: Article
Language:English
Subjects:
Capping
Chemical synthesis
Diffraction
Ferromagnetism
Magnetic fields
Magnetic measurement
Magnetic properties
Magnetic semiconductors
Nanocrystals
Nanoparticles
Optical properties
Photoelectrons
Photoluminescence
Room temperature
Semiconductors
Trioctylphosphine oxide
X-ray photoelectron spectroscopy
Zinc oxide
Zinc oxides
ZnO nanoparticles
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Summary:We report the possibility of room temperature d0Dilute Magnetic Semiconductor (d0DMS) behavior in organic capped Zinc Oxide (ZnO) nanoparticles. The uncapped and organic capped ZnO nanoparticles were prepared through a simple chemical synthesis technique. Tri-n-Octyl Phosphine Oxide (TOPO) and Dodecyle amine (DDA) were used as the capping agents. X-ray diffraction studies reveal that the organically capped nanoparticles were compressively strained. X-ray Photoelectron spectroscopy demonstrated that strain in the nanoparticles arise as the capping promotes vacancy sites for oxygen in ZnO nanocrystals. The magnetic measurements showed a room temperature ferromagnetic ordering in the as prepared ZnO nanoparticles samples. The observed ferromagnetism can be mainly attributed to positional defects in ZnO nanocrystals. In addition, the surface electronic configuration, which is modified by the capping molecules wrapped on the surface of ZnO nanoparticles, also has a key role in the origin of ferromagnetism.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2021.413379