Figure 5
E on and E th of field electron emission in CNTs versus the doped doses of energetic Ag ions. The E on and E th of the AD-CNT arrays, first, gradually decrease with the increase in ion dose from 0 to 3 × 1016 cm−2 and then increase with further increases in ion dose. The minimum E on and E th are about 0.68 and 1.09 V/μm, respectively, which are lower than those of the as-grown CNT arrays