Fabrication and Properties of Carbon- Encapsulated Cobalt Nanoparticles over NaCl by CVD
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Date
2016-09-27
Authors
Li, Haipeng
Li, Yue
Zhang, Yongguang
Liang, Chunyong
Wang, Hongshui
Li, Baoe
Adair, Desmond
Bakenov, Zhumabay
Journal Title
Journal ISSN
Volume Title
Publisher
Nanoscale Research Letters
Abstract
Carbon-encapsulated cobalt (Co@C) nanoparticles, with a tunable structure, were synthesized by chemical vapor deposition using Co nanoparticles as the catalyst and supported on a water-soluble substrate (sodium chloride), which was easily removed by washing and centrifugation. The influences of growth temperature and time on the
structure and magnetic properties of the Co@C nanoparticles were systematically investigated. For different growth temperatures, the magnetic Co nanoparticles were encapsulated by different types of carbon layers, including amorphous carbon layers, graphitic layers, and carbon nanofibers. This inferred a close relationship between the
structure of the carbon-encapsulated metal nanoparticles and the growth temperature. At a fixed growth temperature of 400 °C, prolonged growth time caused an increase in thickness of the carbon layers. The magnetic characterization indicated that the magnetic properties of the obtained Co@C nanoparticles depend not only on the graphitization but
also on the thickness of the encapsulated carbon layer, which were easily controlled by the growth temperatures and times. Optimization of the synthesis process allowed achieving relatively high coercivity of the synthesized Co@C
nanoparticles and enhancement of its ferromagnetic properties, which make this system promising as a magnetic material, particularly for high-density magnetic recording applications.
Description
Keywords
Carbon-encapsulated metal nanoparticles, Sodium chloride, Chemical vapor deposition, Magnetic property
Citation
Li, H., Li, Y., Zhang, Y., Liang, C., Wang, H., Li, B., … Bakenov, Z. (2016). Fabrication and Properties of Carbon-Encapsulated Cobalt Nanoparticles over NaCl by CVD. Nanoscale Research Letters, 11, 432. http://doi.org/10.1186/s11671-016-1645-9