Tuesday, July 16, 2013

1307.3565 (Justin Wu et al.)

Self-Assembly of Semiconducting Single-Walled Carbon Nanotubes into
Dense, Aligned Rafts

Justin Wu, Liying Jiao, Alexander Antaris, Charina L. Choi, Liming Xie, Yingpeng Wu, Shuo Diao, Changxin Chen, Yongsheng Chen, Hongjie Dai
Single-walled carbon nanotubes are promising nanoelectronic materials but face long-standing challenges including production of pure semiconducting SWNTs and integration into ordered structures. Here, highly pure semiconducting single-walled carbon nanotubes are separated from bulk materials and self-assembled into densely aligned rafts driven by depletion attraction forces. Microscopy and spectroscopy revealed a high degree of alignment and a high packing density of ~100 tubes/micron within SWNT rafts. Field-effect transistors made from aligned SWNT rafts afforded short channel (~150 nm long) devices comprised of tens of purely semiconducting SWNTs derived from chemical separation within a < 1 micron channel width, achieving unprecedented high on-currents (up to ~120 microamperes per device) with high on/off ratios. The average on-current was ~ 3-4 microamperes per tube. The results demonstrated densely aligned high quality semiconducting SWNTs for integration into high performance nanoelectronics.
View original: http://arxiv.org/abs/1307.3565

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