Assembly and thermal stability of thin EP-PTCDI films on Ag(111)

Loli, L. N. Serkovic; Sánchez, Esteban; Gayone, J. E.; Grizzi, O.; Esaulov, Vladimir A.

doi:10.1039/b814140c

Cited by 9 publications

(16 citation statements)

References 25 publications

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“…31 A similar trend has also been observed for the case of EP-PTCDI on Ag(111) where a constant sticking probability has been measured until the completion of the first monolayer. 19 The apparent height (the mean height given by the STM at a constant current measurement mode) of the EP-PTCDI islands is about 0.17 ± 0.03 nm, consistent with an adsorption geometry in which the perylene core plane is almost parallel to the surface. 18 The islands show one ordered structure but oriented in four directions.…”

Section: Resultsmentioning

confidence: 52%

Initial Growth of N,N′-Bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide Films on Cu(100)

et al. 2013

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We have studied the initial stages of the adsorption of N,N′-bis(1ethylpropyl)-perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) on Cu(100) using scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and density functional theory (DFT) calculations. STM images show that the EP-PTCDI molecules initially absorb on the surface, forming ordered islands, without preferential nucleation at the step-edges of the terraces as is the case for adsorption of the same molecule on Ag(111). The 2D islands grow upon the completion of the surface with a single-molecular layer. The experimental and simulated LEED patterns show that the molecular arrangement within the islands can be explained by a commensurate superstructure and its four rotational equivalents. The electron spectroscopies show net charge transfer from the surface to the molecule and a decrease of about 0.7 eV in the work function (from 4.59 to 3.9 eV) after a single-layer adsorption. The DFT calculations for the adsorption of a single layer qualitatively reproduce the features observed in STM images and allow us to explain the observed charge exchange behavior together with the work function change.

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Section: Resultsmentioning

confidence: 52%

Initial Growth of N,N′-Bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide Films on Cu(100)

et al. 2013

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“…As reported, this kind of molecules belonging to the class of perylene derivatives are versatile candidates toward organic optoelectronic applications due to their electronic, optical, and charge-transport properties, 16,17 as well as the commercial availability and low cost. In practice, decomposition of the EP-PTCDI molecule has been explored on various substrates in literature reports, and it was figured out that the ketone (C=O) group was directly cleaved from the EP-PTCDI molecule, 18,19 although the underlying mechanism has not been addressed yet. Based on these considerations, herein, we have comprehensively investigated the adsorption and decomposition behaviors of EP-PTCDI on cerium oxide as a function of molecular coverage and post-annealing temperature by X-ray photoelectron spectroscopy (XPS) and valence band spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Adsorption and Decomposition of EP-PTCDI on a Cerium Oxide Surface

Shen

Liang

et al. 2019

ACS Omega

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Cerium oxide has constantly attracted intense attention during the past decade both in research and industry as an appealing catalyst or a noninert support for catalysts, for instance, in the water-gas shift reaction and hydrogenation of the ketone group. Herein, the cerium oxide surface has been chosen to investigate the adsorption and decomposition behaviors of the N,N′-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) molecule by photoelectron spectroscopy. As expected, EP-PTCDI molecules self-assemble on the cerium oxide surface comprising both trivalent and tetravalent cerium at room temperature. Interestingly, the EP-PTCDI molecule exhibits selective adsorption on cerium oxide after the heating treatment. It was found that the ketone group of EP-PTCDI first undergoes hydrogenation after annealing to 400 °C, which is probably related to the fact that high temperature annealing provides sufficient thermal energy to trigger the reaction between the ketone group and trivalent cerium. Furthermore, EP-PTCDI molecules are discovered to start to decompose hierarchically on the ceria substrate from annealing at 400 °C due to the strong molecule–substrate interaction and the effective catalysis by the trivalent cerium, whereas the decomposition sequence of functional groups is revealed to be, first, the ethyl propyl group (−C5H9), followed by the hydrogenated ketone (alcohols) group. Finally, our study may provide a new platform for the fundamental understanding of complex organic reactions on the cerium oxide surface.

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“…The mean thickness for both evaporations over the C and Ag foils was measured with the crystal quartz balance giving a value of 210Å and a film density of 1.5 g/cm 3 . The film density was also checked using the atomic mass of the molecule per volume of the unit cell obtained in a previous work [18,19] with a scanning tunneling microscope.…”

Section: A Experimentsmentioning

confidence: 99%

Stopping power of fluorides and semiconductor organic films for low-velocity protons

et al. 2010

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A combined experimental and theoretical study of the energy loss of protons in fluorides and organic films is presented. The measurements were performed in fresh AlF 3 , LiF, and N ,N -bis(1-ethylpropyl)-perylene-3,4,9,10tetracarboxdiimide (EP-PTCDI) evaporated in situ on self-supported C or Ag foils, covering the very low energy range from 25 keV down to 0.7 keV. The transmission method is used in combination with time-of-flight (TOF) spectrometry. In the case of fluorides with large band gap energies (AlF 3 and LiF), the experimental stopping power increases almost linearly with the mean projectile velocity showing a velocity threshold at about 0.1 a.u. These features are well reproduced by a model based on quantum scattering theory that takes into account the velocity distribution and the excitation of the active 2p electrons in the F − anions, and the properties of the electronic bands of the insulators. In the case of the semiconductor organic film with a lower gap, the experimental stopping power increases linearly with the mean projectile velocity without presenting a clear threshold. This trend is also reproduced by the proposed model.

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Assembly and thermal stability of thin EP-PTCDI films on Ag(111)

Cited by 9 publications

References 25 publications

Initial Growth of N,N′-Bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide Films on Cu(100)

Initial Growth of N,N′-Bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide Films on Cu(100)

Revealing the Adsorption and Decomposition of EP-PTCDI on a Cerium Oxide Surface

Stopping power of fluorides and semiconductor organic films for low-velocity protons

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