Figure 7From: Improved field emission performance of carbon nanotube by introducing copper metallic particles Current-time curve of field emission stability and (inset) field emission luminescence images of green phosphor: (a) Cu-CNT assembly cathode at beginning; (b) Cu-CNT assembly cathode after 24 h; (c) bare-CNTs cathode at beginning; and (d) bare-CNTs cathode after 24 h.Back to article page