Abstract
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 ε-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.
Keywords
Materials scienceCobaltInert gasNanoparticleSelf-assemblyChemical engineeringMagnetic nanoparticlesNanocrystalColloidSuperlatticeNanotechnologyOptoelectronicsComposite material
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Publication Info
- Year
- 2001
- Type
- article
- Volume
- 78
- Issue
- 15
- Pages
- 2187-2189
- Citations
- 303
- Access
- Closed
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Cite This
Víctor Puntes,
Kannan M. Krishnan,
Paul Alivisatos
(2001).
Synthesis, self-assembly, and magnetic behavior of a two-dimensional superlattice of single-crystal ε-Co nanoparticles.
Applied Physics Letters
, 78
(15)
, 2187-2189.
https://doi.org/10.1063/1.1362333
Identifiers
- DOI
- 10.1063/1.1362333