Wafer‐Scale Synthesis of Graphene on Sapphire: Toward Fab‐Compatible Graphene

Laser direct synthesis of graphene on quartz

We demonstrate a laser-based technique to directly synthesize few layer graphene on quartz substrates without using any metal catalyst. In our approach, a photoresist S-1805 (from Shipley Comp.) film coated on quartz wafers was heated, and then decomposed, by irradiation of a continuous-wave laser. The carbon atoms from the photoresist were dissolved in the molten quartz, and then extracted to ...

Controlled synthesis of bilayer graphene on nickel

We report a uniform and low-defect synthesis of bilayer graphene on evaporated polycrystalline nickel films. We used atmospheric pressure chemical vapor deposition with ultra-fast substrate cooling after exposure to methane at 1,000°C. The optimized process parameters, i.e., growth time, annealing profile and flow rates of various gases, are reported. By using Raman spectroscopy mapping, the ra...

Synthesis of Graphene and Graphene-Based Composite Membrane

Towards the Synthesis of Graphene Azide from Graphene Oxide.

In the last decades, organic azides haven proven to be very useful precursors in organic chemistry, for example in 1,3-dipolar cycloaddition reactions (click-chemistry). Likewise, azides can be introduced into graphene oxide with an almost intact carbon framework, namely oxo-functionalized graphene (oxo-G₁), which is a highly oxidized graphene derivative and a powerful precursor for graphene th...

Graphene synthesis and characterization

All graphene was grown using standard literature methods on 25 μm thick Cu foils, as indicated in the main text. Prior to G, Cu substrates were annealed at T = 1000 oC in an H2 environment for ~1 hour. CH4 was then introduced for 10 minutes in order to synthesize graphene, after which the reactor was cooled to room temperature. This anneal was not performed for G growths (except for the sample ...