Graphene makes transistors tunable

Graphene, a one-atom-thick layer of carbon atoms, is the strongest material ever tested and more conductive than the purest silver. Since its isolation in 2004, scientists have been dreaming of impossibly tiny graphene transistors. But there´s a major challenge: The material has no electronic band gap, the semiconductor property that controls the operations of transistors, lasers, and other solid-state devices.