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Solution-State Long-Range Molecular Ordering in Poly(3-hexylthiophene).

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This study reveals that blending poly(3-hexylthiophene) (P3HT) with poly(n-hexyl isocyanate-block-2-vinylpyridine) (PHIC-b-P2VP) forms P3HT nanowires. These nanowires significantly enhance electrical conductivity by 100-fold.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Poly(3-hexylthiophene) (P3HT) is a conductive polymer with potential applications in organic electronics.
  • Controlling the morphology of P3HT is crucial for optimizing its electronic properties.
  • Block copolymers can self-assemble to influence the morphology of other polymers.

Purpose of the Study:

  • To investigate the self-assembly behavior of P3HT when blended with PHIC-b-P2VP.
  • To understand how this self-assembly affects the electronic properties of P3HT.
  • To explore the potential for creating enhanced conductive materials.

Main Methods:

  • Blending P3HT and PHIC-b-P2VP in a common solvent.
  • Characterization of the self-assembled nanostructures using techniques sensitive to morphology and electronic properties.
  • Measurement of electrical current in pristine P3HT and the blended film.

Main Results:

  • Formation of micrometer-scale P3HT nanowires driven by hydrophobic interactions between P3HT and PHIC.
  • Increased planarity of P3HT within the nanowires, leading to a reduced free exciton bandwidth from 67 meV in solution to 9 meV after annealing.
  • A 100-fold increase in electrical current for P3HT nanowires compared to pristine P3HT.

Conclusions:

  • The blend of P3HT and PHIC-b-P2VP effectively induces the formation of highly ordered P3HT nanowires.
  • The enhanced planarity and reduced exciton bandwidth in the nanowires contribute to improved charge transport.
  • This self-assembly strategy offers a promising route to significantly enhance the conductivity of P3HT for electronic applications.