  Nano-rippled graphene, a structurally modified graphene, presents a novel
material with a large range of possible applications including sensors,
electrodes, coatings, optoelectronics, spintronics and straintronics. In this
work we have synthesized macroscopic single layer graphene with well-defined
uniaxial periodic modulation on a stepped Ir(332) substrate and transferred it
to a dielectric support. The applied fast transfer process does not damage the
Ir crystal which can be repeatedly used for graphene synthesis. Upon transfer,
a millimeter sized graphene flake with a uniform periodic nano-ripple structure
is obtained, which exhibits a macroscopically measurable uniaxial strain. The
periodic one dimensional arrangement of graphene ripples was confirmed by
atomic force microscopy and polarized Raman measurements. An important feature
of this system is that the graphene lattice is rotated in several different,
well-defined orientations with respect to the direction of the ripple induced
uniaxial strain. Moreover, geometry of the ripples can be modified by changing
the graphene synthesis parameters.
