They were just around 10-20 atoms that were inside graphene holes. They were technically the first, but I have big doubts about their scalability. The new work

They were just around 10-20 atoms that were inside graphene holes. They were technically the first, but I have big doubts about their scalability. The new work I was mentioning comes from Josh Robinson's lab at Penn State - the same guys that synthesized monolayer gallium nitride 3 years back.