Journal
SMALL
Volume 11, Issue 1, Pages 126-133Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201401890
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Funding
- National Science Foundation [1059020, DMR-1335645]
- Global Climate and Energy Project (GCEP) at Stanford University
- Link foundation Energy fellowship
- DOE Office of Biological and Environmental Research
- National Institutes of Health
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1059020] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1335645] Funding Source: National Science Foundation
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Regioregular poly(3-alkylthiophene) (P3AT) polymers have been previously reported for the selective, high-yield dispersion of semiconducting single-walled carbon nanotubes (SWCNTs) in toluene. Here, five alternative solvents are investigated, namely, tetrahydrofuran, decalin, tetralin, m-xylene, and o-xylene, for the dispersion of SWCNTs by poly(3-dodecylthiophene) P3DDT. The dispersion yield could be increased to over 40% using decalin or o-xylene as the solvents while maintaining high selectivity towards semiconducting SWCNTs. Molecular dynamics (MD) simulations in explicit solvents are used to explain the improved sorting yield. In addition, a general mechanism is proposed to explain the selective dispersion of semiconducting SWCNTs by conjugated polymers. The possibility to perform selective sorting of semiconducting SWCNTs using various solvents provides a greater diversity of semiconducting SWCNT ink properties, such as boiling point, viscosity, and surface tension as well as toxicity. The efficacy of these new semiconducting SWCNT inks is demonstrated by using the high boiling point and high viscosity solvent tetralin for inkjet-printed transistors, where solvent properties are more compatible with the inkjet printing head and improved droplet formation.
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