title: Self-Assembly and Thermal Stability of Binary Superlattices of Gold and Silicon Nanocrystals.
abstract: Simple hexagonal (sh) AB2binary superlattices (BSLs) of organic ligand-capped silicon (A; 5.40(±9.8%) nm diameter) and gold (B; 1.88(±10.1%) nm diameter) nanocrystals were assembled by evaporation of colloidal dispersions and characterized using transmission electron microscopy (TEM) and grazing incidence small-angle X-ray scattering (GISAXS). When deposited on tilted substrates by slow evaporation, the sh-AB2superlattice contracts slightly towards the substrate with centered orthorhombic structure. Heating the BSL to 200°C in air led to gold coalescence and segregation to the surface of the assembly without disrupting the Si nanocrystal sublattice, thus creating a simple hexagonal superlattice of Si nanocrystals.
authors: Department of Chemical Engineering, Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The Univiersity of Texas at Austin, Austin, Texas, 78712-1062, United States.
authors: Yixuan
authors: Y
authors: Yu
authors: Christian A
authors: CA
authors: Bosoy
authors: Detlef-M
authors: DM
authors: Smilgies
authors: Brian A
authors: BA
authors: Korgel
keywords: Binary superlattice; Monodisperse; Si nanocrystal; colloids; self-assembly