Hierarchical self-assembly of amphiphilic semiconducting polymers into isolated, bundled, and branched nanofibers

Amanda C. Kamps, Michael Fryd, So Jung Park

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

Abstract

Herein, we report a high-yield click synthesis and self-assembly of conjugated amphiphilic block copolymers of polythiophene (PHT) and polyethylene glycol (PEG) and their superstructures. A series of different length PHT m-b-PEG n with well-defined relative block lengths was synthesized by a click-coupling reaction and self-assembled into uniform and stably suspended nanofibers in selective solvents. The length of nanofibers was controllable by varying the relative block lengths while keeping other dimensions and optical properties unaffected for a broad range of f PHT (0.41 to 0.82), which indicates that the packing of PHT dominates the self-assembly of PHT m-b-PEG n. Furthermore, superstructures of bundled and branched nanofibers were fabricated through the self-assembly of PHT m-b-PEG n and preformed PHT nanofibers. The shape, length, and density of the hierarchical assembly structures can be controlled by varying the solvent quality, polymer lengths, and block copolymer/homopolymer ratio. This work demonstrates that complex superstructures of organic semiconductors can be fabricated through the bottom-up approach using preformed nanofibers as building blocks.

Original languageEnglish
Pages (from-to)2844-2852
Number of pages9
JournalACS Nano
Volume6
Issue number3
DOIs
StatePublished - 27 Mar 2012

Keywords

  • conjugated block copolymer
  • rod-coil
  • self-assembly
  • supramolecular nanostructures

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