Graphene on Cu foil.
The standard samples of CVD grown graphene on either 0.025 mm or 0.125 mm Cu folis and are almost exclusively monolayer with less than 1% of regions with double layers, which is achieved by special control of temperature, hydrocarbon gas and hydrogen. The typical sizes are 1"x 1" and 5"x 5" but larger dimentions can be also produced on 0.125 mm Cu foil.
Monolayer graphene on Cu foil:
Multilayer graphene on Cu foil:
With increased amount of hydrocarbon gas, CVD of graphene on Cu folis initiates in multilayer islands, which eventually reduce to single layers. The extent of double layers (and higher numbers) can be somewhat controlled but only single layer is continuous. Typical double layer coverage is greater than 50% for 0.025 mm Cu foils and > 70% for 0.125 mm Cu folis. The extent of multilayer coverage can be increased upon request.
Multilayer graphene on Ni film.
The standard samples of CVD grown graphene on Ni covered wafers (>300 nm Ni on 4" SiO2/Si) are combinations of randomly shaped graphene layers of different thickness, from 1 to 5, with average optical thickness corresponding to ~3 layers. Greater thickness and texture can be produced upon request.
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