Degradable conjugated polymers: Synthesis and applications in enrichment of semiconducting single-walled carbon nanotubes

Wei Zhi Wang, Wei Feng Li, Xiao Yong Pan, Chang Ming Li, Lain Jong Li, Yu Guang Mu, John A. Rogers, Mary B. Chan-Park

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Polymers which enrich semiconducting single-walled carbon nanotubes (SWNTs) and are also removable after enrichment are highly desirable for achieving high-performance field-effect transistors (FETs). We have designed and synthesized a new class of alternating copolymers containing mainchain fl uorene and hydrofl uoric acid (HF) degradable disilane for sorting and preferentially suspending semiconducting nanotube species. The results of optical absorbance, photoluminescence emission, and resonant Raman scattering show that poly[(9,9-dioctylfl uorenyl-2,7-diyl)-alt-co-1,1,2,2-tetramethyldisilane] preferentially suspends semiconducting nanotubes with larger chiral angle (25 °-28 °) and larger diameter (1.03 nm-1.17 nm) (specifically (8,7), (9,7) and (9,8) species) present in HiPCO nanotube samples. Computer simulation shows that P1 preferentially interacts with (8,7) (semiconducting) over (7,7) (metallic) species, confirming that P1 selects larger diameter, larger chiral angle semiconducting tubes. P1 wrapped on the surface of SWNTs is easily washed off through degradation of the disilane bond of the alternating polymer main chain in HF, yielding "clean" purified SWNTs. We have applied the semiconducting species enriched SWNTs to prepare solution-processed FET devices with random nanotube network active channels. The devices exhibit stable p-type semiconductor behavior in air with very promising characteristics. The on/off current ratio reaches up to 15 000, with on-current level of around 10 μ A and estimated hole mobility of 5.2 cm 2 V - 1 s - 1.

Original languageEnglish (US)
Pages (from-to)1643-1651
Number of pages9
JournalAdvanced Functional Materials
Volume21
Issue number9
DOIs
StatePublished - May 10 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

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