HYDRGEN-FUNCTIONALIZED CARBON-NANOTUBE RECTFIER AT ROOM TEMPERATUER

摘要

Realization of carbon nanotube (CNT)-based transistors requires preexisting semiconducting CNTs, which are not selectively controllable by the conventional synthesis approaches. While CNT heterojunction and cross junction formed with different chiralities have demonstrated the required performance for CNT transistors, these relied on an accidental junction formation during sample preparation. We propose that hydrogen functionalization of CNTs can transform the electronic structure systematically from metallic (narrow-gap semiconducting) to semiconducting (large-gap semiconducting). We visualize this phenomenon by fabricating a heterojunction between the pristine and the functionalized CNTs that clearly shows both rectifying and gating effects at room temperature.