Raman spectroscopy and imaging of Bernal-stacked bilayer graphene synthesized on copper foil by chemical vapour deposition: growth dependence on temperature

What is it about?

Bernal-stacked bilayer graphene synthesized on Cu foil shows growth dependence on temperature. At lower temperatures, the films are continuous but slightly disordered while at high temperatures they from domains with no disorders. Competition between carbon atoms supply, mobility and desorption rate of the carbon atom species for nucleation of the bilayer graphene as a function of temperature are responsible for the different growths and they are explained.

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Why is it important?

The Bernal-stacked bilayer graphene is known to poses a tunable bandgap of up to 250 mV when an external electric field is applied perpendicular to the two superimposed layers for practical applications such as graphene-based field-effect transistors, which is important in electronic applications. Understanding the growths mechanisms is important for high quality and large scale production.

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