Nanotech 2011

Graphene as a Impermeable Gas Membrane

G. Brunetto, S.B. Legoas, V.R. Coluci, L.S. Lucena, D.S. Galvao
Unicamp, BR

Keywords: graphene, membranes, nanodevices, nan- otechnology, molecular dynamics


Recently, it was proposed that graphene sheets de- posited on silicon oxide can act as impermeable atomic membranes to standard gases, such as helium, argon, and nitrogen. It is assumed that graphene membrane is clamped over the surface due only to van der Waals forces. The leakage mechanism can be experimentally addressed only indirectly. In this work we have carried out molecular dynamics simulations to study this prob- lem. We have considered nano-containers composed of a chamber of silicon oxide filled with gas and sealed by single and multi-layer graphene membranes. The ob- tained results are in good qualitative agreement with the experimental data. We observed that the graphene membranes remain attached to the substrate for pres- sure values up to two times the largest value experi- mentally investigated. We did not observe any gas leak- age through the membrane/substrate interface until the critical limit is reached and then a sudden membrane detachment occurs.

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