文档介绍：NANO
LETTERS
2003
Alcohol Vapor Sensors Based on Vol. 3, No. 7
Single-Walled Carbon Nanotube Field 877-881
Effect Transistors
Takao Someya,*,† Joshua Small,‡ Philip Kim,‡ Colin Nuckolls,† and
James T. Yardley§
Department of Chemistry, Columbia UniVersity, 3000 Broadway,
New York, New York 10027, Department of Physics, Columbia UniVersity,
538 W. 120th St., New York, New York 10027, and Department of Chemical
Engineering, Columbia UniVersity, 530 W. 120th St., New York, New York 10027
Received February 3, 2003; Revised Manuscript Received May 4, 2003
ABSTRACT
We have measured conductance of single-walled semiconducting carbon nanotubes in field-effect transistor (FET) geometry and investigated
the device response to alcoholic vapors. We observe significant changes in FET drain current when the device is exposed to various kinds
of alcoholic vapors. These responses are reversible and reproducible over many cycles of vapor exposure. Our experiments demonstrate that
carbon nanotube FETs are sensitive to a wide range of alcoholic vapors.
Chemical sensors1,2 based on carbon nanotubes have recently given applied gate voltage, we have measured the change in
attracted a great deal of attention. Nanotubes can be expected drain current which can be observed when the whole device
to exhibit excellent properties as transducers since they have is exposed to alcoholic v