Modulating charge density and inelastic optical response in graphene by atmospheric pressure localized intercalation through wrinkles

Abstract

Changes of paradigms, in terms of new functionalities, architectures, and performances, are foreseen with graphene, an atomically thin sheet of carbon atoms in a honeycomb lattice. These prospects are urging the development of efficient production methods.

Unravelling external perturbation effects on the optical phonon response of graphene

“…[] The characteristic G and 2D modes are restored in case of an oxygen layer intercalated between graphene and the metal substrate. []…”

Understanding the intrinsic water wettability of graphite

“…77 Finally, it was recently reported that oxygen can intercalate between graphene and copper upon ambient air exposure. 189,190 Depending on the charge state of the oxygen, the intercalation could potentially increase the polarity of the G/Cu surface and contribute to the observed time evolution of WCA. Additional studies are needed to separate the effect of hydrocarbon contamination and oxygen intercalation on the wettability of supported graphene.…”

Equal variations of the Fermi level and work function in graphene at the nanoscale

“…35 Iridium thin films terminated by a (111) surface, of 10 nm thickness, were prepared on a sapphire substrate 36 and used a support for the growth of graphene. Intercalation occurs gradually upon exposure to ambient conditions 25 and leads to electronic decoupling of the graphene from its metallic substrate along with the appearance of sizable charge disorder. 19 KPFM data on Gr/Ir were obtained at room temperature in the regime of large oscillation amplitudes by using a VT-beam AFM system from Omicron (base pressure below 10 −10 mbar) and silicon cantilevers (Nanoworld, typical spring constant k of 42 N.m −1 , resonance frequency around 300 kHz).…”