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\subsubsection{\texorpdfstring{Glycines on CNTs for alcohol sensing}{Glycines on CNTs for alcohol sensing}}
\label{sec:glycines_on_cnts_for_alcohol_sensing}


Glycines are spontaneously adsorbed to form into self-assembled
nanoclutsers on single-walled carbon nanotubes (SWNTs). After
formation of glycine nanoclusters on SWNTs, the field effect
transistor (FET) devices show selective sensing ability to alcohols,
such as isopropyl alcohol (IPA), methanol, and ethanol. Upon the
adsorption of alcohol, the glycine-coated SWNT-FET devices exhibit
pseudo-metallic transport behaviors, whereas the original and
glycine-coated devices display conventional p-type transport
characteristics. Computational studies support that the gate field
screening effect induced by instantly formed glycine-alcohol pair
layers seems to be responsible for the pseudo-metallic transport
behavior.

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