Here, we present that the air-liquid interfacial self-assembly of nanoparticles and conjugated block copolymers composed of polythiophene and polyethylene glycol (P3HT-<i>b</i>-PEG) can generate highly ordered binary assembly structures of P3HT nanowires and one-dimensional nanoparticle arrays. Structure analyses revealed unique self-assembly behavior and size dependency, which are distinct from the conventional self-assembly of coil-type polymers on solid substrates. Interestingly, hydrophobic quantum dots reside at the interface between P3HT and PEG domains without disrupting P3HT packing structure, which is advantageous for the optoelectronic properties. Furthermore, large particles bridge P3HT nanowires at both ends while small particles decorate each P3HT/PEG interfaces, thus forming tight p-n junctions for a broad size range of nanoparticles. The nanoparticle-incorporated hybrid films showed more than an order of magnitude higher photocurrent and light sensitivity compared to polymer only films, consistent with the assembly structure with close contact between the organic and inorganic semiconductors.

Air-liquid interfacial self-assembly of conjugated block-copolymers and nanoparticles

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.