Large-scale preparation of carbon-encapsulated cobalt nanoparticles by the catalytic method

• Published in: Chemical physics letters Vol. 358; no. 1; pp. 96 - 102
• Main Authors: Liu, B.H., Ding, J., Zhong, Z.Y., Dong, Z.L., White, T., Lin, J.Y.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 24-05-2002; Elsevier Science
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Nanoscale materials and structures: fabrication and characterization; Physics; Encapsulation; Nanoparticles; Magnetic particles; Catalytic reaction; Transmission electron microscopy; Transition elements; Carbon nanotubes; Experimental study; Chemical synthesis; Cobalt; Nanostructured materials
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/S0009-2614(02)00592-4

With strategical selection of the water-soluble sodium chloride (NaCl) as the supporting material, we realized large-scale production of carbon-encapsulated cobalt nanoparticles with a productivity of almost 100%. The products can be fully separated from the supporting materials by simple washing process. When NaCl, NaF and Al
2O
3 were used as supporting materials, the morphologies of the carbon products changed from carbon-encapsulated magnetic nanoparticles (CEMNs) to an intermediate state (quasi-nanocages) between CEMNs and carbon nanotubes (CNTs), and then to CNTs, respectively. NaCl shows strong inhibiting effects on the growth of CNTs, favoring the formation of CEMNs.