Figure 2.

First approaches toward CNT field-emission (FE) cathodes: (a) a single CNT attached to a stalk—a high-resolution SEM image and transmission electron microscope (TEM) image (inset) (reprinted with permission from [80]); (b,c) synthesized and aligned arrays of CNT forest (reprinted with permission from [52])—SEM images of CNT towers (b) and its side-view variation (c), and the schematic cross-section illustration of the array (c—lower image); (d) CNT film deposited by electrophoresis—a schematic illustration presenting the process (reprinted with permission from [82]) with an SEM image of the deposited CNT by electrophoresis (insert view) (reprinted with permission from [81]); (e) the working FED from CNTs deposited by electrophoresis (reprinted with permission from [82]).