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The field emission properties of ion irradiated multiwalled carbon nanotubes(MWCNTs) and doublewalled carbon nanotubes (DWCNTs) have been studied. Thecarbon nanotubes synthesized by a chemical vapor deposition method wereirradiated by high energy (90 MeV) Au ions with different ion fluence from4x1011 to 1x1013 ions/cm2 . After ion irradiation, the field emissionproperties of MWCNTs and DWCNTs were greatly influenced. The change in theemission characteristics is due to structural defects caused by the high energyion irradiation. The emission characteristic of MWCNTs was improved and turn-onfield decreased from 5.43 to 3.10 V/m by ion irradiation. Noticeableimprovement in emission characteristics of MWCNTs was observed at a fluence of1x 10 13 ions/cm2. The emission characteristics of DWCNTs deteriorated and theturn-on field was increased from 2.44 to 7.76 V/m. This results show thedistinctly different behavior of ion irradiated MWCNTs and DWCNTs.

Field emission characteristics of carbon nanotubes according to the high energy ion irradiation