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Graphene Synthesis, Catalysis with Transition Metals and Their Interactions by Laser Photolysis 71 2.7 Unzipping of SWCNT into monolayer graphene A very ingenious idea on realising a monolayer graphene by unzipping single wall carbon nanotubes has been reported recently [31]. At this scale, the unzipping, has been accomplished by harsh acids and the right thermodynamic conditions. A computer generated illustration of the unzipping process is illustrated in Figure 12. Fig. 12. Modelling illustration of the SWCNT unzipped into monolayer graphene [31] 2.8 Carbon implantation into catalyst substrates Ion implantation method for large-scale synthesis of high quality graphene films with controllable thickness has been demonstrated [32,33]. Thermally annealing polycrystalline nickel substrates that have been ion implanted with carbon atoms results in the surface growth of graphene films whose average thickness is controlled by implantation dose. The implantation synthesis method can be generalized to a variety of metallic substrates and growth temperatures, since it does not require a decomposition of chemical precursors or a solvation of carbon into the substrate. 3. Graphene by laser solution photolysis Laser synthesis methods have been of particular interest [34, 35]. The coherent, intense and almost monochromatic laser light allows it to be tuned to selectively dissociate specific bonds in a precursor molecule either by resonance between the laser frequency and the bond’s natural frequency or via multi-photon absorption. This leads to products that can be unique and different from those obtained by traditional thermal deposition techniques. In this work, we followed a process called laser solution photolysis (LSP) that has been used previously to obtain FePt ultra-fine powders [36]. Organo-metallicPDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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