  We investigate the organized formation of strain, ripples and suspended
features in macroscopic CVD-prepared graphene sheets transferred onto a
corrugated substrate made of an ordered arrays of silica pillars of variable
geometries. Depending on the aspect ratio and sharpness of the corrugated
array, graphene can conformally coat the surface, partially collapse, or lay,
fakir-like, fully suspended between pillars over tens of micrometers. Upon
increase of pillar density, ripples in collapsed films display a transition
from random oriented pleats emerging from pillars to ripples linking nearest
neighboring pillars organized in domains of given orientation.
Spatially-resolved Raman spectroscopy, atomic force microscopy and electronic
microscopy reveal uniaxial strain domains in the transferred graphene, which
are induced and controlled by the geometry. We propose a simple theoretical
model to explain the transition between suspended and collapsed graphene. For
the arrays with high aspect ratio pillars, graphene membranes stays suspended
over macroscopic distances with minimal interaction with pillars tip apex. It
offers a platform to tailor stress in graphene layers and open perspectives for
electron transport and nanomechanical applications.
