Abstract Submitted to the    NANOTUBE'04 Conference:

We have observed unusually strong and systematic changes in the electron transport in metallic single-walled carbon nanotubes that are undergoing collisions with inert gas atoms or small molecules. At fixed gas temperature and pressure, changes in the resistance and thermopower of thin films are observed that scale as ~M1/3, where M is the mass of the colliding gas species (He, Ar, Ne, Kr, Xe, CH4, and N2). Results of molecular dynamics simulations are also presented that show that the maximum deformation of the tube wall upon collision and total energy transfer between the colliding atom and the nanotube also exhibit an ~M1/3 dependence. It appears that the transient deformation (or “dent”) in the tube wall may provide a new scattering mechanism needed to explain the atom collision-induced changes in the electrical transport.