Annealing-induced enhancement of ferromagnetism in SnO(2)-core/Cu-shell coaxial nanowires
- Title
- Annealing-induced enhancement of ferromagnetism in SnO(2)-core/Cu-shell coaxial nanowires
- Author
- 최창환
- Keywords
- fibers; annealing; ferromagnetic materials; sputtering; transmission electron microscopy; TEM
- Issue Date
- 2011-08
- Publisher
- KOREAN INST METALS MATERIALS, KIM BLDG 6TH FLOOR, SEOCHO-DAERO 56 GIL 38, SEOCHO-GU, SEOUL 137-881, SOUTH KOREA
- Citation
- METALS AND MATERIALS INTERNATIONAL; AUG 2011, 17, 4, p641-p647, 7p.
- Abstract
- In this study, we have coated tin oxide (SnO2) nanowires with a Cu shell layer via the sputtering method and subsequently investigated the effects of thermal annealing. The annealing-induced changes in morphologies, microstructures, and compositions of the resulting core-shell nanowires were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and energydispersive X-ray spectroscopy (EDX). The Cu shell layers were agglomerated to form clusters, which were mainly comprised of the Cu2O phase. For the first time, a hysteresis loop indicating weak ferromagnetism was observed from the pure SnO2 nanowires. Both the coercivity and the retentivity in the hysteresis loop were slightly increased by Cu-sputtering, indicating a very slight enhancement of ferromagnetism. Also, the ferromagnetic behavior was significantly enhanced by thermal annealing. We discuss the possible mechanisms of annealing-induced enhancement of ferromagnetism in the SiO2/Cu core-shell nanowires, which include the generation of Cu2O phase, Cu-doping into the SnO2 lattice, and the generation of oxygen vacancies in SnO2 core nanowires.
- URI
- https://link.springer.com/article/10.1007%2Fs12540-011-0819-3http://hdl.handle.net/20.500.11754/40459
- ISSN
- 1598-9623
- DOI
- 10.1007/s12540-011-0819-3
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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