Two-dimensional phase of gases physisorbed on a graphene

The phases of gases physically adsorbed on a suspended, free-standing graphene are explored. In particular, three kinds of phase transitions are examined: (1) The quasi-two-dimensional condensation of a van der Waals fluid, (2) Contribution of the substrate-mediated interaction energy to the ground state energy of monolayer solid and liquid phases of He on graphene, and (3) Wetting transition of water and other fluids on graphene. In each case, the difference from those for adsorption on graphite will be presented.