New research shows that hyrogen plays a crucial role in growing graphene grains

Researchers from the US Department of Energy's Oak Ridge National Laboratory that graphene grains shape and size are controlled by hydrogen and not only by carbon. The team developed a method to grow graphene grains that has perfect hexagonal shapes.

Up until now hyrogen was thought to play a passive role in the process of making graphene - but the new research shows that it has a crucial role.