Two- or three-tier graphene films can be produced at commercial scale and create band gap for electronic devices
When compounds of bromine or chlorine (represented in blue) are introduced into a block of graphite (shown in green), the atoms find their way into the structure in between every third sheet, thus increasing the spacing between those sheets and making it easier to split them apart. Image: Chih-Jen Shih/Christine Daniloff A team of MIT …