Graphene Properties Differ to Different Humid Environment
Graphene is discovered made from carbon in 2004, and it's credited for properties of lightweight, transparent, flexible, etc. It's more conductive than copper, and also stronger than steel.
It's reported bi-layer graphene-two sheets of one atom thick carbon, plus water enters between the layers in the humid condition.
The graphene's properties greatly reply on an interaction between layers of carbon, and water enters can alter such interaction.