“In situ” STM studies of the ordering process of a nonplanar derivative of PTCDI on Ag(110)

Nowakowski, Robert; Seidel, Christian; Fuchs, Harald

doi:10.1016/j.susc.2004.05.006

Cited by 15 publications

(18 citation statements)

References 26 publications

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“…This result shows that the unit cell and its orientation with respect to the substrate are different as compared with other PTCDI derivatives. 12,13 For thicker films it was difficult to obtain good STM images, so we tried to perform some LEED measurements, but could not obtain new spots different from those of the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…7,8 The PTCDI (perylene-3,4,9,10-tetracarboxdiimide) derivative molecules have shown to be good candidates in these fields. 1,[9][10][11] However, from some existing studies, [12][13][14] it appears that the interactions among these molecules and between them and the substrate have a high degree of intricacy, can impair order and change the anisotropic properties and the thermal stability of the layers. It is therefore interesting to study how the interaction of different functionalized PTCDI molecules affect the order, the electronic properties and the interfacial chemistry on different substrates, as it was observed for DM-PTCDI films grown on silver, 12 and on gallium arsenide where the interface with the organic molecules is also formed by depositing silver or indium on top of the organic film.…”

Section: Introductionmentioning

confidence: 99%

“…The choice of Ag(111) substrate was motivated by the fact that its intermediate metal-adsorbate interaction strength allows formation of self-assembled monolayers, as it was observed in the case of PTCDA, [18][19][20] PTCDI and a few other simple derivatives. [12][13][14]21…”

Section: Introductionmentioning

confidence: 99%

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

Loli

Sánchez

Gayone

et al. 2009

Phys. Chem. Chem. Phys.

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We report a multi-technique study of the adsorption kinetics and self-assembly characteristics of EP-PTCDI grown on Ag(111) at UHV conditions and room temperature. Changes in the valence band characteristics for the mono and the multilayer film and the stability as a function of the annealing temperature are discussed. The results show that the molecules start to adsorb on the step edges forming ordered islands that grow to fully cover a monolayer. Further exposure results in the stacking of similarly ordered islands of several layers. The desorption experiment shows that the film is stable up to 150 degrees C where a rapid desorption of the multilayer takes place, followed by a decomposition of the molecules for temperatures higher than 170 degrees C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Loli

Sánchez

Gayone

et al. 2009

Phys. Chem. Chem. Phys.

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“…Hence, it is quite probable that Cu/HfO 2 catalysts function according to Figure 1. The HfO 2 at the boundary with Cu particles may be an alternative source of O dϪ entities; HfO 2 supports are known to stabilize small Cu particles and a In general, effects of restructurization of a catalyst resulting from an interaction with adsorbate were in situ observed by Nowakowski et al 2004!. prevent their sintering~Janik-Czachor et al, 2002!.…”

Section: Cu-hf Catalystmentioning

confidence: 99%

Microstructural and Auger Microanalytical Characterization of Cu-Hf and Cu-Ti Catalysts

Pisarek

Janik‐Czachor

2006

Microsc. Microanal.

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Degradation processes occurring at the surface and in the bulk of Cu-based amorphous alloys during cathodic hydrogen charging were used for promoting the catalytic activity of such alloys. These processes modifying the structure, composition, and morphology of the substrate proved to be useful methods for transforming Cu-Hf and inactive Cu-Ti amorphous alloy precursors into active and durable catalysts. Indeed, their catalytic activity for dehydrogenation of 2-propanol increased up to a conversion level of approximately 60% at selectivities to acetone of about 99% for Cu-Ti and to conversion of approximately 90% at selectivities of approximately 95% for Cu-Hf. Previous attempts carried out by aging in air or hydrogen charging from the gas phase resulted in a maximum conversion level up to 15% for Cu-Hf and up to 3% for Cu-Ti. High resolution Auger spectroscopy allowed changes occurring during the activation process to be identified, namely, the formation of small Cu particles on the HfO2 surface and the formation of highly porous particles containing mostly Cu and some Ti and O (Cu-Ti-O) on a Cu-Ti substrate. Differences in the chemistry and structure of both catalysts are discussed, and the implications for catalytic function are considered. A probable configuration of active sites on the Cu-Ti-O/Ti-O-Cu catalyst for dehydrogenation of 2-propanol is proposed.

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“…Scanning tunneling microscopy (STM) is very well suited for the investigations of the self-assembly phenomena, provided that monolayers of the studied compounds can be obtained on appropriate substrates such as gold single crystals or HOPG, assuring images at molecular resolution, for example [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%