1 research outputs found
QuasiâFreestanding Graphene via Sulfur Intercalation: Evidence for a Transition State
Abstract Sulfur intercalation of a carbon rich (63Ă63)R30â reconstruction on silicon carbide, also known as buffer layer, is reported. In a twoâzone furnace a sulfur rich precursor is heated and the gaseous species is transported for intercalation by an argon flow to the sample. Successful intercalation can be confirmed by Xâray photoelectron spectroscopy and lowâenergy electron diffraction. Angleâresolved photoelectron spectroscopy reveals a pâtype doping of the intercalated samples. In some cases only partial intercalation appears with nonâintercalated sulfur on top of the remaining buffer layer areas. Further annealing of such samples leads to a migration of the nonâintercalated sulfur under the buffer layer areas, indicating that the sulfur bonded to the buffer layer constitutes a transition state