  The current characteristics of DNA decorated carbon nanotubes for different
gas odors are studied. A simple model of charge transfer between the
Gas-DNA-base complex and single wall carbon nanotube (SWCN) is proposed to
explain the current response for different odors. The autocorrelation and
two-point correlation functions are calculated for the current sensitivity
curves. These correlation functions together with the current characteristics
form finger-prints for detection of the odor and DNA sequence.
