Self-organized graphene crystal patterns

摘要: The phenomenon of ordered pattern formation is universal in nature but involves complex non-equilibrium processes that are highly important for both fundamental research and applied materials systems. Among countless systems, a snowflake possibly the most fascinating example offered by nature. Here, we report single-layered single-crystalline graphene flakes (GFs) with regular hexagonal symmetric patterns can be grown on liquid copper surface using CH4 chemical vapor deposition (CVD) method. different morphologies these GFs precisely tailored varying composition inert gas/H2 carrier gas mixture used to produce GFs, GF edges continuously tuned over full spectrum from negative zero positive curvature controllable way. family crystal remarkably analogous snowflakes, representing an ideal two-dimensional (2D) growth system. Pattern formations compact dendritic explained continuous modulation competition between adatom diffusion along island or corners processes.