  Highly oriented pyrolytic graphite (HOPG) was scribed by pulsed laser beam to
produce square patterns. Patterning of HOPG surface facilitates the detachment
of graphene layers during contact printing. Direct HOPG-to-substrate and
glue-assisted stamp printing of a few-layers graphene was compared. Printed
graphene sheets were visualized by optical and scanning electron microscopy.
The number of graphene layers was measured by atomic force microscopy.
Glue-assisted stamp printing allows printing relatively large graphene sheets
(40x40 microns) onto a silicon wafer, which can be important for
microelectronics fabrication. The presented method is easier to implement and
is more flexible than the majority of existing ways of placing graphene sheets
onto a substrate.
