Researchers from the University of Illinois at Urbana-Champaign, the University of Pennsylvania, and the University of California, Berkeley have demonstrated a new way to change the amount of electrons that reside in a given region within a piece of graphene, a proof-of-principle in making the fundamental building blocks of semiconductor devices using the 2D material. The study was a collaboration between the research groups of Andrew Rappe at the University of Pennsylvania, Lane Martin at the University of California, and Moonsub Shim, an associate professor of materials science and engineering and a Willett Faculty Scholar at Illinois. Its results were published in the journal Nature Communications.