Graphene is a new carbonaceous material in which carbon atoms are closely packed into a single-layer two-dimensional honeycomb. The thickness is only 0.335 nm, which is only one in 200,000 parts of hair. As a new type of nanomaterial that is currently found to be the thinnest, strongest, and most conductive and thermally conductive, scientists even predict that graphene will "completely change the 21st century." It is very possible to set off a revolutionary new technology and new industrial revolution that has swept the world.