Field Emission Properties of ZnO, ZnS, and GaN Nanostructures

We review the growth and field emission (FE) properties of ZnO, ZnS, and GaN nanostructures. For ZnO nanostructures, we discuss in detail solution-based growth techniques and the effects of residual gas exposure on the FE properties. We present new results showing that O2 and CO2 exposures do not have a significant effect on the FE properties of ZnO nanorods, but N2 exposure significantly degrades them. We also present new results showing that Cs deposition significantly improves the FE properties of GaN nanorods.