Nano Research

Article Title

Length-sorted semiconducting carbon nanotubes for high-mobility thin film transistors


Single-walled carbon nanotubes, separation, thin-film transistors, gel filtration, dispersion, optical absorption, carrier mobility


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.

Graphical Abstract


Tsinghua University Press