Summary: Graphene Shape Control by Multistage Cutting and
By Lijie Ci,* Li Song, Deep Jariwala, Ana Laura EliŽas, Wei Gao,
Mauricio Terrones, and Pulickel M. Ajayan*
The fascinating properties of graphene render it very promising
for electronics applications, such as field-effect transistors and
interconnects. For these applications, appropriate processes are
required to tailor graphene sheets into desired geometries with
specific dimensions, smooth edges, and specific edge types.
By combining electron-beam lithography and plasma etching,[6,7]
graphene nanoribbon devices have been fabricated and tested.
However, the production of graphene devices with smooth edges,
well-defined shapes, and controlled edge configuration (zigzag or
armchair edged) is still a challenge. Nanocutting of graphene
sheets has been realized using nanometer-sized nickel
in hydrogen atmosphere at high temperatures, a
process referred to as catalytic hydrogenation.