Journal
NANO RESEARCH
Volume 4, Issue 11, Pages 1129-1135Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-011-0161-6
Keywords
Carbon nanotubes; conjugated polymers; nanocomposites; organic thin film transistors
Categories
Funding
- Korea Science and Engineering Foundation
- Ministry of Science Technology [2010-0019132]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science, and Technology [2010-1079000, R32-10051]
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Poly(3-hexylthiophene) (P3HT) has received much attention as a good candidate to replace inorganic semiconductors for flexible electronics due to its solution-processability. However, the low charge mobility of P3HT is an obstacle to its commercialization. To overcome this problem, we propose a new non-covalent functionalization method for carbon nanotubes (CNTs) for use in CNT/P3HT nanocomposites. By using modified pyrene molecules with hydrophobic long alkyl chains, the non-covalently functionalized CNTs can become well dispersed in hydrophobic solutions and organic semiconductor matrices. Fabrication of organic thin-film transistors (OTFTs) from the non-covalently functionalized CNT/organic semiconductor nanocomposites shows that our non-covalent functionalization method significantly reduces damage to CNTs during functionalization when compared with covalent functionalization by treatment with acids. The OTFTs show 15 times enhancement of field effect mobility (1.5 x 10(-2) cm(2)/(V center dot s)) compared to the mobility of OTFTs made from pure P3HT. This enhancement is achieved by addition of only 0.25 wt% of CNTs to P3HT.
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