Enhanced ferromagnetism in graphite-like carbon layer-coated ZnO crystals

We report on the preparation of graphite-like carbon-coated ZnO nanoparticles by ball milling a powder mixture of ZnO and C. Magnetic measurements indicated that carbon coating can strongly enhance the room-temperature ferromagnetism of ZnO nanoparticles, depending on preparation conditions. This en...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 695; pp. 233 - 237
Main Authors Tu, N., Dung, N.H., Lan, N.T., Nguyen, K.T., Dung, N.D., Viet, D.X., Tuan, N.T., Bui, H.V., Nam, D.V., Huy, P.T., Saito, N.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.02.2017
Subjects
Carbon
Ferromagnetism
Semiconductor
Zinc oxide
Zinc oxide
Semiconductor
Ferromagnetism
Carbon
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Summary:We report on the preparation of graphite-like carbon-coated ZnO nanoparticles by ball milling a powder mixture of ZnO and C. Magnetic measurements indicated that carbon coating can strongly enhance the room-temperature ferromagnetism of ZnO nanoparticles, depending on preparation conditions. This enhancement may stem from robust ferromagnetism at the ZnO/C interface. The origin of interfacial ferromagnetism is attributed to crystallographic defects at the surface of ZnO crystals which are stabilized by the carbon shell layer. •Carbon coating enhances the room temperature ferromagnetism of ZnO nanoparticles.•The enhancement may stem from robust ferromagnetism at the ZnO/C interface.•The origin of interfacial ferromagnetism is due to surface defects of ZnO crystals.•The surface defects of ZnO crystals are stabilized by the carbon shell layer.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.10.200