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We have developed a process for chemical purification of carbon nanotubes for solution-processable thin-film transistors (TFTs) having high mobility. Films of the purified carbon nanotubes fabricated by simple drop coating showed carrier mobilities as high as 164 cm2V−1s−1, normalized transconductances of 0.78 Sm−1, and on/off current ratios of 106. Such high performance requires the preparation of a suspension of micrometer-long and highly purified semiconducting single-walled carbon nanotubes (SWCNTs). Our purification process includes length and electronic-type selective trapping of SWCNTs using recycling gel filtration with a mixture of surfactants. The results provide an important milestone toward printed high-speed and large-area electronics with roll-to-roll and ink-jet device fabrication.
We thank Y. Okigawa, K. Hata, and D. Sun for useful discussion and experimental help with device fabrication and transport measurements. This work has been supported by the Grant-in-Aid for Specific Area Research (No. 19084008) on Carbon Nanotube Nano-Electronics and for Scientific Research (S) (No. 22225001) of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. Y. M. acknowledges the financial support by a Grant-in-Aid for Young Scientists (Start-up) from the Japan Society for the Promotion of Science.