Ultrahigh Density Alignment of Carbon Nanotube Arrays by Dielectrophoresis

Shekhar, Shashank and Stokes, Paul and Khondaker, Saiful I.. (2011) Ultrahigh Density Alignment of Carbon Nanotube Arrays by Dielectrophoresis. ACS Nano, 5 (3). p. 1739. ISSN 1936-0851

Full text not available from this repository.


We report ultrahigh density assembly of aligned single-walled carbon nanotube (SWNT) two-dimensional arrays via AC dielectrophoresis using high-quality surfactant-free and stable SWNT solutions. After optimization of frequency and trapping time, we can reproducibly control the linear density of the SWNT between prefabricated electrodes from 0.5 SWNT/μm to more than 30 SWNT/μm by tuning the concentration of the nanotubes in the solution. Our maximum density of 30 SWNT/μm is the highest for aligned arrays via any solution processing technique reported so far. Further increase of SWNT concentration results in a dense array with multiple layers. We discuss how the orientation and density of the nanotubes vary with concentrations and channel lengths. Electrical measurement data show that the densely packed aligned arrays have low sheet resistances. Selective removal of metallic SWNTs via controlled electrical breakdown produced field-effect transistors with high current on−off ratio. Ultrahigh density alignment reported here will have important implications in fabricating high-quality devices for digital and analog electronics.

Item Type: Article
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanodevice Structures
Nanoscale Objects and Nanostructured Materials > Nanotubes
Collections: Nanomanufacturing Research Collection
Depositing User: Amulya Gullapalli
Date Deposited: 13 Jul 2011 03:23
Last Modified: 13 Jul 2011 03:23
URI: http://eprints.internano.org/id/eprint/632

Actions (login required)

View Item View Item