Morphology-controllable fabrication and enhanced field emission of multilayer graphene-silicon nanowire composites

摘要

Multilayer graphene-silicon nanowire (MLG-SiNW) composites were prepared by using microwave plasma enhanced chemical vapor deposition and their field emission (FE) characteristics were studied. The morphology of MLG-SiNW composites can be readily controlled by tuning the concentration of carbon source and the microwave power. The FE study indicates that MLG-SiNW composites have superior FE performance to that of SiNWs. MLG-SiNW composites with optimal morphology exhibit excellent FE properties. They have a low turn-on electric field of 2.42 V/μm and also have good FE stability. We consider that both the large aspect ratio of SiNWs and the unique structure of MLGs are responsible for the enhanced FE properties.