One‐Step Self‐Assembly, Alignment, and Patterning of Organic Semiconductor Nanowires by Controlled Evaporation of Confined Microfluids

Concentric rings of organic nanowires (see schematic and micrographs) were prepared simply by controlling the evaporation of a droplet of dye solution in a confined space. By adjusting the initial concentration, the density and spacing of the concentric arrays of organic nanowires can be tuned. This facile approach can also be used to produce large-scale organic semiconductor devices with nanowire configuration.