Controlled electrostatic gating of carbon nanotube FET devices

Alexander B. Artyukhin, Michael Stadermann, Raymond W. Friddle, Pieter Stroeve, Olgica Bakajin, Aleksandr Noy

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


Carbon nanotube transistors are a promising platform for the next generation of nonoptical biosensors. However, the exact nature of the biomolecule interactions with nanotubes in these devices remains unknown, creating one of the major obstacles to their practical use. We assembled alternating layers of oppositely charged polyelectrolytes on the carbon nanotube transistors to mimic gating of these devices by charged molecules. The devices showed reproducible oscillations of the transistor threshold voltage depending on the polarity of the outer polymer layer in the multilayer film. This behavior shows excellent agreement with the predictions of a simple electrostatic model. Finally, we demonstrate that complex interactions of adsorbed species with the device substrate and the surrounding electrolyte can produce significant and sometimes unexpected effects on the device characteristics.

Original languageEnglish (US)
Pages (from-to)2080-2085
Number of pages6
JournalNano Letters
Issue number9
StatePublished - Sep 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)


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