Some researchers claim graphene is the most important substance since the first synthetic plastic was created.
As far as we know, graphene is pure carbon thin film that has only few atoms thick. Carbon atoms have flat structure with honeycomb pattern. As the entire film is connected by C-C covalent bond, graphene is considered to be an extremely tough material. Anyone with some science background would know that this material is stronger than metal, as the strength of C-C bond is much stronger than that of a metal bond. Carbon fiber is a great example, although carbon atoms in carbon fiber cannot be connected by 100% C-C bond at all.
Since graphene is so strong, It is said that, a graphene sheet as thin as clingfilm could support and elephant. Although it could be true, it is unrealistic so far. In micro scale, graphene is strong because of the strength of C-C bond. However, it is still very fragile if the material is incredibly thin. The graphene film synthesized by the best scientists today may have one or few layers of atoms, which means, the thickness of a single layer graphene film is about only 1 nm! As 1nm is less than 0.0000001 inch, even a clingfilm is very thick, compared with the thickness of graphene.
The graphene film recently synthesized is using a method called chemical vapor deposition (CVD). The carbon atoms are actually deposited on a substrate one by one to produce a film, and this process is very expensive. You may try to buy single atom layer graphene films and lay them together to make a thin “clingfilm” that could hold an elephant, but it will spend all you have and it is totally a waste of money. As a strong material, graphene could be used to make strong products like helmets in the future, but not now.