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The Electrochemical Carbon Nanotube Field-Effect Transistor

M. Krueger, M. R. Buitelaar, T. Nussbaumer, C. Schoenenberger, L. Forro

cond-mat.mes-hallarXiv:cond-mat/0009171

Abstract

We explore the electric-field effect of carbon nanotubes (NTs) in electrolytes. Due to the large gate capacitance, Fermi energy shifts of order +/- 1 V can be induced, enabling to tune NTs from p to n-type. Consequently, large resistance changes are measured. At zero gate voltage the NTs are hole doped in air with EF ? 0.3-0.5 eV, corresponding to a doping level of ? 1013 cm-2. Hole-doping increases in the electrolyte. This hole doping (oxidation) is most likely caused by the adsorption of oxygen in air and cations in the electrolyte.

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