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Emission enhancement by a postprocess treatment: (a,c) the pair of emission patterns from CNT FE cathode arrays before (upper view), and after laser irradiation (lower view); (b,d) the FE characteristic of the cathodes before and after laser irradiation. The inset in (d) shows the cathode operation at a periodic O2 supply, i.e., oxygen trimming is on or off. Figure 13a,b reprinted with permission from [133], and Figure 13c,d reprinted with permission from [134].
