Full text loading...
(Color online) SEM images of (a) pristine and (c) RuO2 deposited t-MWCNTs. TEM images of (b) pristine CNTs, (d) RuO2-coated CNTs, and RuO2-coated CNTs after annealing at (e) 300 °C, (f) 600 °C, and (g)1000 °C. (h)-(k) Ru 3d and C 1s core-level spectra obtained from (a)-(f). (l) O 1s core-level spectra of RuO2-coated CNTs before and after annealing at 300 °C and 600 °C.
(Color online) Emission current density as a function of the applied field and FN plot (inset) obtained from pristine, RuO2-deposited, and the Ru-NPs decorated CNTs after annealing at 300 °C, 600 °C, and 1000 °C.
(Color online) UPS spectra in the region of the (a) secondary-cutoff and (b) valence band maximum for the pristine, RuO2-deposited, and Ru-NPs decorated CNTs. (c) Changes in the WF (square) and the integrated area of DOS (circle) as a function of the annealing temperature.
Experimental results of UPS and the J-E characteristics. (The field enhancement factor (β) was calculated from the slope (κ) of the FN plot.)
Article metrics loading...