Restoring a free-standing character of graphene on Ru(0001)
Elena Voloshina, Nikolai Berdunov, and Yuriy Dedkov
TL;DR
This study demonstrates the creation of a uniform free-standing graphene layer on Ru(0001) through oxygen intercalation, revealing its electronic properties and doping level, supported by experimental and theoretical analysis.
Contribution
It introduces a method to produce free-standing graphene on Ru(0001) and characterizes its electronic structure using combined experimental and DFT approaches.
Findings
Graphene is heavily p-doped with Dirac point 552 meV above Fermi level
Oxygen intercalation decouples graphene from Ru(0001) substrate
Experimental results agree with DFT calculations
Abstract
Realization of a free-standing graphene is always a demanding task. Here we use scanning probe microscopy and spectroscopy to study the crystallographic structure and electronic properties of the uniform free-standing graphene layers obtained by intercalation of oxygen monolayer in the "strongly" bonded graphene/Ru(0001) interface. Spectroscopic data show that such graphene layer is heavily p-doped with the Dirac point located at 552 meV above the Fermi level. Experimental data are understood within DFT and the observed effects are in good agreement with the theoretical data.
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