Abstract
Graphene, a one-atom-thick two-dimensional carbon sheet, has been extensively studied owing to its broad applications in nanoelectronics, [ 1 , 2 ] nanocomposites, [ 3 , 4 ] chemical sensors and biosensors, [ 5–10 ] solar cells, [ 11–13 ] and electrical and optical devices. [ 14–16 ] However, the application of graphene in fi eldeffect transistors (FETs) is limited because of its semi-metallic behavior with zero bandgap. [ 17 , 18 ] Cutting graphene sheets into nanoribbons led to bandgap opening, with current ON/OFF ratio large enough for transistor operation. [ 19–23 ] Unfortunately, FET devices based on the individual nanoribbons exhibited low driving current and conductance. [ 22 ]
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