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(Color online) Emission current vs. applied field characteristics measured for the CNT emitters considered in this study. The inserted pictures are the FESEM images of the CNTs deposited on the conical-type W-tip substrate and the magnified image of the CNTs’ surface, respectively.
(Color online) XPS results for C 1s and Hf 4f, measured for all the CNT samples.
(Color online) Results of the nano-scratch test performed with all the CNT samples. The pictures on the first row represent the first peel-off states of each CNT, and the pictures on the second row show the final peel-off states of each sample at the force of 3mN.
(Color online) Long-term (up to 24 h) emission stability results measured for all the CNT emitters considered in this study.
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