Abstract
A discussion is presented of some of the work reported during the early 21st century describing modifications to field emitter arrays (FEAs). Discussion is focused on FEAs of metals ( Mo and Si ), of ZnO , and of carbon nanotubes (CNTs). Particular attention is given to modifications that lower the FEA turn-on field, and to the "screening effect" of closely packed emitters in an FEA. Hydrothermal synthesis briefly is described as a preparation technique.
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