title: Stacking of hexagonal nanocrystal layers during Langmuir-Blodgett deposition.
abstract: Hexagonally ordered close-packed monolayers of sterically stabilized FePt nanocrystals were deposited on substrates using the Langmuir-Blodgett technique. Monolayers of nanocrystals were also stacked by sequential Langmuir-Blodgett transfer. The structures of the nanocrystal monolayers and multilayer stacks were examined with scanning electron microscopy (SEM) and grazing-incidence small-angle scattering (GISAXS). An analytical model derived from the quasikinematic approximation provides a convenient description of the GISAXS data of the stacked layers. The transferred monolayers showed good in-plane hexagonal order, even for trilayers. Bilayers exhibited spatial registry with the top layer positioned above the 3-fold coordinated sites of the bottom layer. Trilayers, on the other hand, exhibited significant disorder.
authors.affiliation: Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, USA. dms79@cornell.edu
authors.forename: Detlef-M
authors.initials: DM
authors.lastname: Smilgies
authors.forename: Andrew T
authors.initials: AT
authors.lastname: Heitsch
authors.forename: Brian A
authors.initials: BA
authors.lastname: Korgel
mesh_terms: D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D053838:Scattering, Small Angle; D014961:X-Ray Diffraction