Frequency modulation atomic force microscopy (FM-AFM) was employed to study molecular structures of rubrene single crystals in ultrahigh vacuum. Molecularly flat and extraordinarily wide terraces were extended over the width of more than a few micrometers with monomolecular steps. Molecular packing arrangements and internal structures were revealed by FM-AFM. The unit cell determined by FM-AFM was consistent with the lattice parameters of bulk crystal within the experimental error, suggesting that the surface structure of rubrene is not reconstructed.
High-resolution molecular images of rubrene single crystals obtained by frequency modulation atomic force microscopy
Taketoshi Minato, Hiroto Aoki, Hirokazu Fukidome, Thorsten Wagner, Kingo Itaya; High-resolution molecular images of rubrene single crystals obtained by frequency modulation atomic force microscopy. Appl. Phys. Lett. 31 August 2009; 95 (9): 093302. https://doi.org/10.1063/1.3184770
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