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Influence of Dispersion Interactions on the Thermal Desorption of Nonplanar Polycyclic Aromatic Hydrocarbons on HOPG
Author(s) -
Weippert Jürgen,
Huber Philipp,
Schulz Ayla,
Amsharov Konstantin Y.,
Böttcher Artur,
Kappes Manfred M.
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900348
Subject(s) - rubrene , highly oriented pyrolytic graphite , binding energy , thermal desorption , molecule , dispersion (optics) , intermolecular force , desorption , materials science , graphite , analytical chemistry (journal) , chemistry , chemical physics , adsorption , atomic physics , organic chemistry , physics , optics
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 C 60 H 30 (FPC) and rubrene C 42 H 28 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: C 60 H 30 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 C 42 H 18 . In contrast to FPC, rubrene shows a significant (intermolecular) lateral dispersion contribution to the binding energy as the submonolayer coverage increases.