Bottom‐Up Growth of Graphene Nanospears and Nanoribbons

One dimensional graphene nanostructures are one of the most promising materials for next generation electronics. Here, chemical vapor depostion growth nanoribbons (GNRs) and nanospears (GNSs) on a copper surface is reported. The GNRs GNSs enabled by vapor–liquid–solid (VLS) mechanism guided on-surface propagation liquid Cu-Si catalyst particle. slow lateral fast VLS vertical give rise to spear head-shaped GNSs. In situ observations further confirm that can be completely suppressed thus grown. synthesized field effect transistor (FET) devices show have high carrier mobilities ≈2000 cm2 V−1 s−1. Both FET Kelvin probe force microscopy measurements Fermi levels synthesize shift downward from wide part tip strongly p-doped. These findings yield key insights into open door achieving facile scalable method synthesizing free standing their applications, such as Fermi-level tunable devices.