Alternating current dielectrophoresis of carbon nanotubes

Zhi Bin Zhang; Xian Jie Liu; Eleanor E.B. Campbell; Shi Li Zhang

doi:10.1063/1.2037866

Alternating current dielectrophoresis of carbon nanotubes

Zhi Bin Zhang, Xian Jie Liu, Eleanor E.B. Campbell, Shi Li Zhang

Department of Physics

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We report on the deposition of individual semiconducting single-walled carbon nanotubes (s-SWNTs), suspended in an aqueous solution of sodium dodecylsulfate (SDS), onto predefined electrodes using alternating current dielectrophoresis up to 100 MHz. The successful deposition is attributed to the formation of an ionic double layer encapsulating the nanotubes by surface adsorption of the SDS molecules. The nanotube-micella complex formed has a greater polarization than that of the s-SWNTs, which is theoretically shown to be frequency dependent up to 10 GHz. Carbon nanotube field-effect transistors showing large onoff-state current ratios of 108 were demonstrated.

Original language	English
Article number	056103
Journal	Journal of Applied Physics
Volume	98
Issue number	5
DOIs	https://doi.org/10.1063/1.2037866
State	Published - 1 Sep 2005

Bibliographical note

Funding Information:
The authors are grateful to Professor G. Y. Guo for discussing his computational results on the frequency dependence of dielectric constant of SWNTs and to D. Z. Lee and S.-Y. Wu for help with sample preparation. This work was supported by the Swedish Research Council (VR) (No. 621-2002-4099).

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Alternating current dielectrophoresis of carbon nanotubes

Abstract

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