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The contrast obtained in scanning tunneling microscopy (STM) and atomic forcemicroscopy (AFM) images is determined by the tip termination and symmetry.Functionalizing the tip with a single metal atom, CO molecule or organicspecies has been shown to provide high spatial resolution and insights intotip-surface interactions. A topic where this concept is utilized is theadsorption of organic molecules at surfaces. With this work we aim tocontribute to the growing database of organic molecules that allow assignmentby intra-molecular imaging. We investigated the organic moleculepara-sexiphenyl (C36H26, 6P) on Cu(100) using low-temperature STM andnon-contact AFM with intra-molecular resolution. In the sub-monolayer regime wefind a planar and flat adsorption with the 6P molecules rotated 10{\deg} offthe <010> directions. In this configuration, four of the six phenyl ringsoccupy almost equivalent sites on the surface. The 6P molecules are furtherinvestigated with CO- functionalized tips, in comparison to a single-atom metaland 6P-terminated tip. We also show that the procedure of using adsorbed CO tocharacterize tips introduced by Hofmann et al. Phys. Rev. B 112 (2014) 066101is useful when the tip is terminated with an organic molecule.

Sexiphenyl on Cu(100): nc-AFM tip functionalization and identification