(543a) Capillary-Driven Clustering of Semiconductor Nanorods into End-to-End Network and Vortex Structures
Semiconductor nanorods in the strong quantum confinement regime exhibit both size-dependent energy gap and anisotropy-derived optical properties, such as linearly polarized emission. Self-assembly of these elongated nanomaterials into long range order has been pursued for long in the past, only to garner relatively marginal progress. In this presentation, the capillary force between nanorods at the assembly interface will be discussed in the context of long-range clustering of of CdSe nanorods into two-dimensioanl end-to-end network. In addition, nanorods that cluster into upright assembly often exhibit vortex structures, which will ultimately hamper perfect arrangement of nanorods into long range. The vortex formation has been discussed in previous literature; however, in most cases, the mechanism with which the vortices form has been left to speculation. In this regard, we investigated the effect of solvent polarity on the formation or prevention of vortex structures. In this presentation, we will discuss the implication of the vortexes from the viewpoint that the nanorod-to-nanorod distance will affect carrier dynamics via inter-nanorod energy transfer.
 Kim D, Kim W D, Kang M S, Kim S-H, Lee D C 2015 Nano Lett. 15 714
 Kim W D, Chae W.-S., Bae W K, Lee D C 2015 Chem. Mater. 27 2797