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Science 4 July 2008:
Vol. 321. no. 5885, pp. 101 - 104
DOI: 10.1126/science.1156588
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Reports

Self-Sorted, Aligned Nanotube Networks for Thin-Film Transistors

Melburne C. LeMieux,1 Mark Roberts,1 Soumendra Barman,1 Yong Wan Jin,2 Jong Min Kim,2 Zhenan Bao1*

To find use in electronics, single-walled carbon nanotubes need to be efficiently separated by electronic type and aligned to ensure optimal and reproducible electronic properties. We report the fabrication of single-walled carbon nanotube (SWNT) network field-effect transistors, deposited from solution, possessing controllable topology and an on/off ratio as high as 900,000. The spin-assisted alignment and density of the SWNTs are tuned by different surfaces that effectively vary the degree of interaction with surface functionalities in the device channel. This leads to a self-sorted SWNT network in which nanotube chirality separation and simultaneous control of density and alignment occur in one step during device fabrication. Micro-Raman experiments corroborate device results as a function of surface chemistry, indicating enrichment of the specific SWNT electronic type absorbed onto the modified dielectric.

1 Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
2 Samsung Advanced Institute of Technology, Giheung-gu, Younggin-si Gyunggi-do 449-712, South Korea.

* To whom correspondence should be addressed. E-mail: zbao{at}stanford.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Omnidirectional Printing of Flexible, Stretchable, and Spanning Silver Microelectrodes.
B. Y. Ahn, E. B. Duoss, M. J. Motala, X. Guo, S.-I. Park, Y. Xiong, J. Yoon, R. G. Nuzzo, J. A. Rogers, and J. A. Lewis (2009)
Science 323, 1590-1593
   Abstract »    Full Text »    PDF »
Suppression of Metallic Conductivity of Single-Walled Carbon Nanotubes by Cycloaddition Reactions.
M. Kanungo, H. Lu, G. G. Malliaras, and G. B. Blanchet (2009)
Science 323, 234-237
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)