Hooge's Constant of Carbon Nanotube Field Effect Transistors
  The 1/f noise in individual semiconducting carbon nanotubes (s-CNT) in a field effect transistor configuration has been measured in ultra-high vacuum and following exposure to air. The amplitude of the normalized current spectral noise density is independent of source-drain current, indicating the noise is due to mobility rather than number fluctuations. Hooge's constant for s-CNT is found to be 9.3 plus minus 0.4x10^-3. The magnitude of the 1/f noise is substantially degreased by exposing the devices to air. 
Masa Ishigami, J.H. Chen, E.D. Williams, D. Tobias, Y.F. Chen, M.S.   Fuhrer