“…To overcome the issue, several posttreatment methods for the printed CNTs cathode have been developed, including surface rubbing technique, 1 adhesive tape technique, 8 ion irradiation, 10,11 plasma etching, 9 and laser irradiation. 12 These methods are effective in improving the field emission characteristics of CNTs cathodes. However, in surface rubbing and adhesive tape techniques, particles impurity or contamination can be brought into the CNTs cathode, which can give rise to emission degradation or arc events between the electrodes.…”