Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene

Abstract

We study the interplay of chemisorbed hydrogen and physisorbed PbPc molecules on epitaxial graphene by means of surface transport and density functional theory. While the adsorption of atomic hydrogen induces strong localization by local sp3 rehybridization of the graphene lattice, PbPc is not affecting the transport properties of clean graphene. Moreover, on hydrogenated graphene, PbPc is selectively lifting the lattice distortion, while binding the atomic hydrogen and recovering the conductivity of the pristine graphene. Our results show that graphene is a multipurpose template for sensing both chemisorbed and physisorbed species and the implementation of a chemical selectivity.

π-Orbital mediated charge transfer channels in a monolayer Gr–NiPc heterointerface unveiled by soft X-ray electron spectroscopies and DFT calculations

“…Furthermore, due to its insulating nature, SiC is particularly suitable for all those applications that require to restrict the current flow to the graphene or the molecular layers. Moreover, the Gr-SiC system has been recently studied as a substrate for the growth and adsorption of metal phthalocyanine complexes, focusing on the STM analysis of the adsorption geometry and temporary charging, 19,[33][34][35][36][37] with interesting perspectives as hybrid architectures for molecular spin qubits. 38,39 In this work, we managed to build and characterize a novel heterointerface between a monolayer of Gr transferred onto SiC and a physisorbed single layer of NiPc that was obtained by thermal evaporation in ultra-high vacuum conditions.…”

“…Furthermore, due to its insulating nature, SiC is particularly suitable for all those applications that require to restrict the current flow to the graphene or the molecular layers. Moreover, the Gr–SiC system has been recently studied as a substrate for the growth and adsorption of metal phthalocyanine complexes, focusing on the STM analysis of the adsorption geometry and temporary charging, 19,33–37 with interesting perspectives as hybrid architectures for molecular spin qubits. 38,39…”