While graphene lacks a bandgap, 2D molybdenum disulfide has one naturally. One-Molecule-Thick Material Has Big Advantages The molybdenum atoms are teal and the sulfur yellow in the diagram. ...graphene and MoS2 are just the beginning of a new realm of research on two-dimensional materials. "It's the most exciting time for electronics in the last 20 or 30 years," he says. "It's opening up the door…