Large Area Mapping of Graphene Grain Structure and Orientation

摘要

Chemical vapor deposited (CVD) graphene grows as a polycrystalline sheet with grains that are oriented in many directions. There is a push to increase the size of these grains until a large single-crystal graphene sheet can be achieved. With the increase in grain size comes the need to be able to determine the lattice orientation of larger areas. Here we present a method using a simple well-known transmission electron microscopy (TEM) technique that allows us to map the orientation of a 50μm by 50μm area of graphene. This method created the largest graphene orientation map to date and has the ability to scale with the increasing grain sizes. From the map, statistics and interpretations were drawn, giving details about the graphene grown through the CVD recipe.