期刊
Nanoscale Research Letters
卷 11, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/s11671-016-1645-9
关键词
Carbon-encapsulated metal nanoparticles; Sodium chloride; Chemical vapor deposition; Magnetic property
资金
- National Natural Science Foundation of China [51201056, 21406052]
- Scientific Research Foundation for Selected Overseas Chinese Scholars
- Ministry of Human Resources and Social Security of China [CG2015003002]
- Program for the Outstanding Young Talents of Hebei Province [BJ2014010]
- Natural Science Foundation of Hebei Province of China [E2015202037, E2013202021]
- Ministry of Education and Science of Kazakhstan [4649/GF4, 5156/GF4]
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 degrees 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据