Germanene is a one atom thick sheet of germanium, in a honeycomb structure. It has clear similarities with graphene, the material that induced massive research activity worldwide, especially after 2010's Nobel Prize. A major difference between graphene and germanene is the 'band gap', a property well-known in semiconductor electronics: thanks to this 'jump' of energy levels that electrons are allowed to have, it is possible to control, switch and amplify currents. Graphene had a very small band gap that can only be measured at very low temperatures, germanene shows a band gap that is significantly larger. Previous attempts to grow germanene, however, show that these attractive properties seem to vanish when it is grown on a metal surface: a good conductor of current. To prevent this, the scientists chose the semiconductor MoS2 as the substrate material.
via Science Daily
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