Influence of Dispersion Interactions on the Thermal Desorption of Nonplanar Polycyclic Aromatic Hydrocarbons on HOPG. Issue 11 (22nd August 2019)

• Record Type: Journal Article
• Authors: Weippert, Jürgen; Huber, Philipp; Schulz, Ayla; Amsharov, Konstantin Y.; Böttcher, Artur; Kappes, Manfred M.
• Is Part Of: Physica status solidi. Volume 13:Issue 11(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-22
• Subjects: atomic force microscopy -- desorption -- dispersion -- polycyclic aromatic hydrocarbons -- Runge–Kutta integration -- temperature-programmed desorption; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201900348
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : A combination of low energy ion beam deposition and mass resolved thermal desorption spectroscopy is applied to analyze the binding behavior of two nonplanar polycyclic aromatic hydrocarbons (PAHs) to highly oriented pyrolytic graphite (HOPG) surfaces—also concerning their lateral dispersion interactions. In particular, the fullerene precursor C60 H30 (FPC) and rubrene C42 H28 are studied. Due to their smaller contact areas, both molecules exhibit significantly weaker binding energies to the HOPG surface compared to planar PAHs of similar size: C60 H30 is bound to the surface by 3.04 eV, which is 0.6 eV lower than for a fully planar homologue. For rubrene, an isolated molecule–substrate binding energy of 1.59 eV is found, which is about 1 eV less than that of the corresponding planar homologue hexabenzocoronene C42 H18 . In contrast to FPC, rubrene shows a significant (intermolecular) lateral dispersion contribution to the binding energy as the submonolayer coverage increases. Abstract : Rubrene is a nonplanar polycyclic aromatic hydrocarbon (PAH) that exhibits significant lateral interactions when deposited on highly oriented pyrolytic graphite (HOPG).