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Lee, H. Cheun, et al. Procedia Chemistry 19 (2016): 916-921.
Graphene's extraordinary properties show some promising applications, such as optoelectronics, photovoltaic systems, composite materials, etc. Here introduces several methods for synthesizing single-layer graphene to improve its quality, size, and quantity.
Synthesis Methods of Single-layer Graphene
· Carbon precursor
In the synthesis of single-layer graphene, various types of precursors can be used, including solid, liquid, and gaseous precursors. Hydrocarbon gas precursors are the most popular carbon sources due to their higher purity than liquids and solids.
· Catalyst
Transition metals have been used to synthesize high-quality carbon nanotubes and graphene. There are many types of metal catalysts, including platinum (Pt), cobalt (Co), nickel (Ni), copper (Cu), et al. When graphene is grown by CVD, although wrinkled graphene films are obtained, graphene is still grown with platinum as a catalyst. It is reported that the low carbon solubility of platinum leads to the formation of single-layer graphene on platinum. Cobalt (Co) is a commonly used transition metal for growing uniform single-layer graphene.
· Pressure
Using low-pressure chemical vapor deposition, single-layer uniform graphene films with low defect density have been successfully prepared. However, when graphene films are grown by atmospheric pressure chemical vapor deposition, the single-layer and multi-layer graphene films obtained are not uniform and mixed together. However, by reducing the methane concentration in the mixed gas, a single-layer graphene film can be obtained.
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