▎ 摘　　要

We fabricate monolayer graphene coated ultrathin Bi2Sr2CaCu2O8+delta heterostructures and perform the transport measurements to investigate the electrical stabilities of the heterostructures with integrated and hole existed graphene coatings respectively in the presence of water. Both of the samples demonstrate robust superconductivities although small degradation is observed in the latter. Graphene not only serves as an impermeable barrier but also inhibits the transverse penetration of water and loss of oxygen through the interface of the van der Waals heterostructure. Our results contribute to the promising applications of graphene as the conductive, conformal, and impermeable surface coating material on the chemically active two-dimensional crystals.