Fabrication and Properties of Carbon-Encapsulated Cobalt Nanoparticles over NaCl by CVD.
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.
School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.|Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China.
Haipeng
H
Li
School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.|Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China.
Yue
Y
Li
Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China. yongguangzhang@hebut.edu.cn.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China. yongguangzhang@hebut.edu.cn.
Yongguang
Y
Zhang
School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.|Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China.
Chunyong
C
Liang
School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.|Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China.
Hongshui
H
Wang
School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.|Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China.|Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300130, China.
Baoe
B
Li
Institute of Batteries LLC, PI National Laboratory Astana System, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan.
Desmond
D
Adair
Institute of Batteries LLC, PI National Laboratory Astana System, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan.
Zhumabay
Z
Bakenov
Carbon-encapsulated metal nanoparticles; Chemical vapor deposition; Magnetic property; Sodium chloride
Basic Res Cardiol. 2008 Mar;103(2):122-30
18324368
J Nanosci Nanotechnol. 2008 Jun;8(6):2781-92
18681015
Science. 1996 Dec 13;274(5294):1897-9
8943200
Small. 2005 Aug;1(8-9):798-801
17193525
J Nanosci Nanotechnol. 2002 Feb;2(1):25-8
12908314