Synthesis, self-assembly, and magnetic behavior of a two-dimensional superlattice of single-crystal {epsilon}-Co nanoparticles
A method of producing high-quality magnetic colloidal dispersions by the rapid pyrolysis of cobalt carbonyl in an inert atmosphere was employed to produce monodispersed, stabilized, defect-free {epsilon}-cobalt nanocrystals, with spherical shapes and sizes ranging from 3 to 17 nm. The size distribution and the shape of the nanocrystals were controlled by varying the surfactant (oleic acid, phosphonic oxides and acids, etc.), its concentration, and the reaction temperature. These particles have been observed to produce two-dimensional self-assemblies when evaporated at low rates in a controlled atmosphere. A collective behavior due to dipolar interactions has been observed in the low susceptibility measurements corresponding to a highly ordered fine particles system.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205269
- Journal Information:
- Applied Physics Letters, Vol. 78, Issue 15; Other Information: DOI: 10.1063/1.1362333; Othernumber: APPLAB000078000015002187000001; 022115APL; PBD: 9 Apr 2001; ISSN 0003-6951
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis of hcp-Co nanodisks
Study of the structural features of ε-Co nanoparticles synthesized by cobalt carbonyl decomposition in the presence of surfactant