Self-Assembly
and Thermal Stability of Binary Superlattices
of Gold and Silicon Nanocrystals
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Abstract
Simple
hexagonal (sh) AB<sub>2</sub> binary 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-AB<sub>2</sub> superlattice contracted slightly toward 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 sh superlattice of Si nanocrystals
