Stacking several separate layers of graphene is useful for several applications, such as supercapacitors. But stacked graphene forms a graphite-like mass, which makes it less useful. Researchers from Monash University in Australia discovered that keeping graphene wet can keep it from stacking.
The team got their idea from examining Graphene Paper - which is made by filter graphene suspended in water. The water acts as a spacer between the individual graphene layers.