Self-Assembly of Si Nanoparticles: Emergence of Two-Dimensional Si Nanoparticle Lattices

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Abstract
Monolayers consisting of two-dimensional (2D) Si nanoparticle lattices were synthesized using a self-assembly process of Si nanoparticles at an octanol/aqueous solution interface. The component nanoparticles were prepared in an aqueous solution by dissolving Si sub-oxide powder that contained Si nanocrystals. The Si nanocrystals, which were dispersed in the aqueous solution, were transferred into an octanol phase and assembled at the octanol/aqueous solution interface. The average diameter of the component nanocrystals in the 2D lattices varied from 7 to 11 nm in different lattices, which suggests that the lattices incorporate nanoparticles of the same size and expel those of different sizes during lattice growth.