title: Colloidal synthesis and self-assembly of CoPt(3) nanocrystals.
abstract: Reduction of platinum acetylacetonate and thermodecomposition of cobalt carbonyl in the presence of 1-adamantanecarboxylic acid were employed in different coordinating mixtures to produce monodisperse, highly crystalline CoPt(3) nanoparticles. The mean particle size can be varied from 1.5 to 7.2 nm by controlling the reaction conditions and the type of coordinating mixture. As-synthesized CoPt(3) particles represent single crystal domains and have chemically disordered face-centered cubic (fcc) structure. Nearly spherical CoPt(3) nanocrystals were found to assemble into two- (2D) and three-dimensional (3D) structures. An AB(5) type superlattice is observed by TEM after mixing two nanoparticle samples with different mean sizes. Slow precipitation led to the formation of facetted colloidal crystals with sizes up to 20 microm.
authors.affiliation: Institute of Physical Chemistry, University of Hamburg, D-20146 Hamburg, Germany.
authors.forename: Elena V
authors.initials: EV
authors.lastname: Shevchenko
authors.forename: Dmitri V
authors.initials: DV
authors.lastname: Talapin
authors.forename: Andrey L
authors.initials: AL
authors.lastname: Rogach
authors.forename: Andreas
authors.initials: A
authors.lastname: Kornowski
authors.forename: Markus
authors.initials: M
authors.lastname: Haase
authors.forename: Horst
authors.initials: H
authors.lastname: Weller