  A fluid-based method is demonstrated for preparing graphene nanomeshes (GNMs)
directly from pristine graphite flakes by a one-step process. The high
efficiency is attributed to the combination of fluid-assisted exfoliation and
perforation of the graphene sheets. Atomic force microscopy shows that the
as-produced GNMs are less than 1.5 nm thick. The total area of the pores within
1 um2 of the GNM sheet is estimated as ~0.15 um2 and the pore density as ~22
um-2, The yield of GNMs from pristine graphite powder and the power consumption
for per gram GNM synthesis are evaluated as 5 wt% and 120 kWh, respectively.
X-ray photoelectron spectroscopy, infrared spectroscopy, elemental analysis and
Raman spectroscopy results indicate the purity of the GNMs and thus it is a
green efficient method. The present work is expected to facilitate the
production of GNMs in large scale.
