Self-assembly of semi-conducting polymers has been widely investigated due to intriguing optoelectronic properties for the application. Among various methods to assemble nanostructure using the semi-conducting polymers, direct self-assembly methods into two-dimensional (2D) nanostructures have proven difficult because of strong supramolecular interactions between conjugated polymers. Therefore, the amphiphilic block copolymer with post-treatment such as changing chemical environments was required for formation of 2D-nanostructures. Here, we report the synthesis of conjugated homopolymer by living cyclopolymerization of 1,6-heptadiyne having fluorene moiety and its <i>in situ</i> assembly behavior of large-area 2D-fluorescent semi-conducting nanostructures. Using high-resolution visualization methods, such as AFM and TEM, we observed rectangle-, raft-, and leaf-shaped 2D-sheets. Interestingly, we proposed a unique slip-stack packing model and orthorhombic unit cell with interdigitating between fluorene side-chains based on the crystallinity information obtained from XRD and HR-TEM. The fluorescence of 2D-nanosheets enabled the super-resolution fluorescent imaging, thereby allowing for the real-time monitoring of the individual nanostructures in solution.

Direct formation of large area two-dimensional nanosheets from fluorescent semi-conducting homopolymer with new orthorhombic crystalline orientation

253rd National Meeting (2017)

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