Interaction of solid organic acids with carbon nanotube field effect transistors

Physics – Condensed Matter – Materials Science

Scientific paper

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5 pages, 4 figures, 1 table

Scientific paper

10.1016/j.cplett.2006.08.090

A series of solid organic acids were used to p-dope carbon nanotubes. The extent of doping is shown to be dependent on the pKa value of the acids. Highly fluorinated carboxylic acids and sulfonic acids are very effective in shifting the threshold voltage and making carbon nanotube field effect transistors to be more p-type devices. Weaker acids like phosphonic or hydroxamic acids had less effect. The doping of the devices was accompanied by a reduction of the hysteresis in the transfer characteristics. In-solution doping survives standard fabrication processes and renders p-doped carbon nanotube field effect transistors with good transport characteristics.

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