sentences:  Randomly oriented nanobuds have already been demonstrated to have an extremely low work function for field electron emission.Reported test measurements show (macroscopic) field thresholds of about 0.65 V/μm, (non-functionalized single-walled carbon nanotubes have a macroscopic field threshold for field electron emission ~2 V/μm) and a much higher current density as compared with that of the corresponding pure single-walled carbon nanotubes.The electron transport properties of certain nanobud classes have been treated theoretically.