2013
DOI: 10.1021/jp402852u
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Commensurate Growth of Densely Packed PTCDI Islands on the Rutile TiO2(110) Surface

Abstract: We have studied the deposition of perylene-tetracarboxylic-diimide, PTCDI, on the rutile (1 × 1)-TiO2(110) surface. At variance with other polyaromatic hydrocarbons, like acenes, PTCDI displays a significant interaction with this dielectric substrate. At moderate substrate temperature (∼400 K), first layer molecules aggregate into two-dimensional islands corresponding to a (1 × 5) commensurate phase. According to our surface diffraction, STM, and NEXAFS studies, the substrate accommodates one PTCDI molecule pe… Show more

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Cited by 20 publications
(40 citation statements)
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“…We can conclude that perylene in the monolayer is tilted around the long molecular axis, which is also aligned along the substrate [001] direction. We notice that the tilt angle of B261 is rather small as compared with that of other poly-and heteroaromatics like PTCDI, 32 hexahydroxy-tri-phenylene 33 and pentacene 31 (g B 351, 321 and 251, respectively). While still compatible with a molecular width slightly larger than 7 Å, this tilt angle would suggest that the perylene assembling is not driven by intermolecular p-p interaction, at variance with the aforementioned systems, rather it simply reflects the substrate corrugation.…”
Section: Carbon K-edge Nexafsmentioning
confidence: 78%
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“…We can conclude that perylene in the monolayer is tilted around the long molecular axis, which is also aligned along the substrate [001] direction. We notice that the tilt angle of B261 is rather small as compared with that of other poly-and heteroaromatics like PTCDI, 32 hexahydroxy-tri-phenylene 33 and pentacene 31 (g B 351, 321 and 251, respectively). While still compatible with a molecular width slightly larger than 7 Å, this tilt angle would suggest that the perylene assembling is not driven by intermolecular p-p interaction, at variance with the aforementioned systems, rather it simply reflects the substrate corrugation.…”
Section: Carbon K-edge Nexafsmentioning
confidence: 78%
“…From the intensity ratio between the first p* resonances measured in TE (with the electric field oriented along the [1% 10] direction) and TM geometry, we can estimate an average tilting of PTCDI around the major axis by g B 401. This value is larger than for the PTCDI monolayer because of a lower degree of order, 32 as also suggested by the occurrence of a residual intensity of the p* resonances in the spectrum measured in TE geometry when the electric field is oriented along the [001] direction. Nonetheless, PTCDI grows on a first layer that is commensurate to the substrate, 32 thus the film is expected to display a good vertical stacking of next molecular layers.…”
Section: Ptcdimentioning
confidence: 90%
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