| Abstract Scope |
This talk provides a brief review of our work on the formation of novel 2D materials of graphene (G), graphene oxide (GO), reduced graphene oxide (RGO), and h-BN. Using high-power nanosecond laser pulses, amorphous carbon layers can be converted into G, GO, and RGO in a controlled way, where thickness is determined by the depth of laser-solid interaction. Similarly, amorphous BN is converted into h-BN by pulsed laser annealing. In another approach, carbon implanted copper substrates are annealed to create G, GO, and RGO. Here the thickness of graphene is controlled precisely by the dose of implanted carbon, as all the carbon zonerefines to the surface. Since amorphous carbon is p-type and RGO is n-type, p-n junctions can be written in controlled way. Upon laser annealing, RGO layers exhibit robust room-temperature ferromagnetism with Curie temperature over 500C. Since the nonequilibrium laser melting involves first-order phase transformation, we obtain phase-pure phases. |