Selective dispersion of SWNTs using conjugated polymers is a powerful and scalable strategy for enriching semiconducting SWNTs (s-SWNTs). Up to now, only �large bandgap� polymers, such as poly(phenylene vinylene), polythiophene and polyfluorene based polymers, have been used to selectively disperse s-SWNTs, but these polymers have relatively weak p-p interactions and limited applications in transistors and solar cells. Here we report the first example of using low bandgap donor-acceptor (D-A) polymers for selective dispersion of s-SWNTs. Through rational molecular design and modulating the polymer-SWNT interactions, we achieved highly selective dispersion of s-SWNTs with diameters over 1.5 nm.Using the sorted s-SWNTs, high-performance SWNT network transistors are fabricated. The transistors simultaneously demonstrate a high mobility over 40 cm2 V�1 s�1 and on/off ratio of >105. Our results demonstrate that low bandgap D-A polymers are a promising class of polymers for the selective dispersion of s-SWNTs, especially for large diameter ones.

Diketopyrrolopyrrole (DPP)-based donor-acceptor polymers for scalable and selective dispersion of large-diameter carbon nanotubes

248th National Meeting (2014)

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