Journal
ACS NANO
Volume 5, Issue 3, Pages 1739-1746Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn102305z
Keywords
carbon nanotube; directed assembly; solution processed; array
Categories
Funding
- U.S. National Science Foundation [ECCS-0748091]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0748091] Funding Source: National Science Foundation
Ask authors/readers for more resources
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/mu m to more than 30 SWNT/mu m by tuning the concentration of the nanotubes in the solution. Our Maximum density of 30 SWNT/mu m 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available