Charge transfer from ammonia physisorbed on nanotubes.

  title={Charge transfer from ammonia physisorbed on nanotubes.},
  author={Keith Bradley and Jean-Christophe P Gabriel and Mikhail Briman and Alexander Star and George Gr{\"u}ner},
  journal={Physical review letters},
  volume={91 21},
We report the use of nanotube field-effect transistor devices for chemical sensing in a conducting liquid environment. Detection of ammonia occurs through the shift of the gate voltage dependence of the source-drain current. We attribute this shift to charge transfer from adsorbed ammonia molecules, with the amount of charge estimated to be as small as 40 electrons for the smallest shift detected. Using the concentration dependence of the response as an adsorption isotherm, we are able to… CONTINUE READING
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