A Review Paper on “Graphene Field Emission for Electron Microscopy”

Although good field emission from graphene has been demonstrated from a wide variety of different micro-fabricated structures, very few of them can be used to improve the design of cold field emitters for electron microscopy applications. Most of them consist of densely packed nano-emitters, which produce a large array of defocused overlapping electron beams, and therefore cannot be subsequently defocused down to a single nano-meter electron probe. This paper reviews the kind of single-tip cathode structures suitable in cold field emission guns for instruments such as the Scanning Electron Microscopy, Transmission Electron Microscope or the Scanning Transmission Electron Microscopy, and reviews progress in fabricating them from graphene based materials.