Carbon Nanotubes as Electrodes for Dielectrophoresis of DNA

Details Carbon Nanotubes as Electrodes for Dielectrophoresis of DNA Carbon Nanotubes as Electrodes for Dielectrophoresis of DNA

2006-07-18

arxiv.org/abs/cond-mat/0607446v1

Nano Lett. 6 (2006) 1339-1343

Physics

Condensed Matter

Soft Condensed Matter

5 pages with 6 figures

Scientific paper

10.1021/nl060771m

Dielectrophoresis can potentially be used as an efficient trapping tool in the fabrication of molecular devices. For nanoscale objects, however, the Brownian motion poses a challenge. We show that the use of carbon nanotube electrodes makes it possible to apply relatively low trapping voltages and still achieve high enough field gradients for trapping nanoscale objects, e.g., single molecules. We compare the efficiency and other characteristics of dielectrophoresis between carbon nanotube electrodes and lithographically fabricated metallic electrodes, in the case of trapping nanoscale DNA molecules. The results are analyzed using finite element method simulations and reveal information about the frequency dependent polarizability of DNA.

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