Structural study of monolayer cobalt phthalocyanine adsorbed on graphite

Abstract

We present microscopic investigations on the two-dimensional arrangement of cobalt phthalocyanine molecules on a graphite (HOPG) substrate in the low coverage regime. The initial growth and ordering of molecular layers is revealed in high resolution scanning tunneling microscopy (STM). On low coverages single molecules orient mostly along one of the substrate lattice directions, while they form chains at slightly higher coverage. Structures with two different unit cells can be found from the first monolayer on. A theoretical model based on potential energy calculations is presented, which relates the two phases to the driving ordering forces.

Insights into radiation damage from atomic resolution scanning transmission electron microscopy imaging of mono-layer CuPcCl16 films on graphene

“…In contrast the shape of the individual molecules and even the 16 chlorine atoms around their edges are clearly visible in panel b. The crystal structure corresponds well with what has been reported earlier, both for monolayer crystals with STM and bulk crystals with (S)TEM 11,13,14,20,21,28 . The critical electron dose, however, is much lower for our monolayer compared to what has been reported for bulk crystals 6,7,9,10,12 two main reasons for this: First, the critical electron dose was defined as the dose where the diffraction spot intensity has decayed to 1 e .…”

Surface chemistry of porphyrins and phthalocyanines

“…Single MnPc molecules on HOPG were preferentially oriented along the substrate lattice, while at higher coverages, short-range ordering to chains with high mobility was observed. Monolayers consisted of two structurally different domains [312]. Similar findings were reported for FePc submonolayers after annealing to 670 K, whereas apparently kinetically controlled 3D growth occurred during room temperature deposition [313].…”

Surface functionalization of WSe2 by F16CoPc

“…This value is about one order of magnitude smaller than what one would expect under the assumption that the surface is covered by an ideal monolayer of flat lying F 16 CoPc molecules and that each molecule accepts a full charge (electron). We note, that flat lying phthalocyanine molecules have been reported on graphite or graphene .…”