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Creating nanopores in graphene is a powerful tool for engineering itsproperties. Nanopores in graphene tune their electrical, optical, magnetic, andmechanical properties. However, controlling nanopores formation at thenanoscale level remains a significant challenge. We report an easy method tocontrol nanopore sizes using argon-plasma magnetron sputtering. By calculatingand measuring Raman spectra, we show that the nano-pores in graphene arecontrollable and size-tunable. Furthermore, we report that the graphene Ramanmode around 1450 cm-1, which was attributed to the substrate effect, is due tonanopores.  We also propose here a novel graphene device-based water filtration. Ourproposed concept of two graphene electrodes with nanopores on the substrate(SiC and SiO2) makes it possible to have the highest permeability value,keeping almost 100 % salt rejection and improving its mechanical properties.These reported results are essential for developing water desalinationmembranes based on graphene devices.

Nanopore creation in graphene at the nanoscale for water desalination