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Surface stress and large-scale self-organization at organic-metal interfaces

Abstract

The role of elastic interactions, particularly for the self-organized formation of periodically faceted interfaces, was investigated in this thesis for archetype organic-metal interfaces. The cantilever bending technique was applied to study the change of surface stress upon formation of the interface between 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) and Ag(111). The main focus of this work was on the investigation of the formation of the long-range ordered, self-organized faceted PTCDA/Ag(10 8 7) interface. Reciprocal space maps of this interface were recorded both by spot profile analysis low energy electron diffraction (SPA-LEED) and low energy electron microscopy (LEEM) in selected area LEED mode. Complementary to the reciprocal data, also microscopic real-space LEEM data were used to characterize the morphology of this interface. Six different facet faces ((111), (532), (743), (954), (13 9 5), and (542)) were observed for the preparation path of molecular adsorption on the substrate kept at 550 K. Facet-sensitive dark-field LEEM localized these facets to grow in homogeneous areas of microscopic extensions. The temperature-dependence of the interface formation was studied in a range between 418 K and 612 K in order to learn more about the kinetics of the process. Additional steeper facets of 27 inclination with respect to the (111) surface  More>>
Publication Date:
Jan 22, 2009
Product Type:
Thesis/Dissertation
Report Number:
ETDE-DE-2031
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.)
Subject:
36 MATERIALS SCIENCE; SURFACES; STRESSES; SILVER; INTERFACES; PERYLENE; ELECTRON DIFFRACTION; ELECTRON MICROSCOPY; MORPHOLOGY; ADSORPTION; SUBSTRATES; TEMPERATURE DEPENDENCE; ANISOTROPY; NANOSTRUCTURES; CARBOXYLIC ACIDS; TEMPERATURE RANGE 0400-1000 K; INTERACTION RANGE
OSTI ID:
21197604
Research Organizations:
Wuerzburg Univ. (Germany). Fakultaet fuer Physik und Astronomie
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
TRN: DE09G8322
Availability:
Commercial reproduction prohibited; OSTI as DE21197604
Submitting Site:
DE
Size:
183 pages
Announcement Date:
Aug 19, 2009

Citation Formats

Pollinger, Florian. Surface stress and large-scale self-organization at organic-metal interfaces. Germany: N. p., 2009. Web.
Pollinger, Florian. Surface stress and large-scale self-organization at organic-metal interfaces. Germany.
Pollinger, Florian. 2009. "Surface stress and large-scale self-organization at organic-metal interfaces." Germany.
@misc{etde_21197604,
title = {Surface stress and large-scale self-organization at organic-metal interfaces}
author = {Pollinger, Florian}
abstractNote = {The role of elastic interactions, particularly for the self-organized formation of periodically faceted interfaces, was investigated in this thesis for archetype organic-metal interfaces. The cantilever bending technique was applied to study the change of surface stress upon formation of the interface between 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) and Ag(111). The main focus of this work was on the investigation of the formation of the long-range ordered, self-organized faceted PTCDA/Ag(10 8 7) interface. Reciprocal space maps of this interface were recorded both by spot profile analysis low energy electron diffraction (SPA-LEED) and low energy electron microscopy (LEEM) in selected area LEED mode. Complementary to the reciprocal data, also microscopic real-space LEEM data were used to characterize the morphology of this interface. Six different facet faces ((111), (532), (743), (954), (13 9 5), and (542)) were observed for the preparation path of molecular adsorption on the substrate kept at 550 K. Facet-sensitive dark-field LEEM localized these facets to grow in homogeneous areas of microscopic extensions. The temperature-dependence of the interface formation was studied in a range between 418 K and 612 K in order to learn more about the kinetics of the process. Additional steeper facets of 27 inclination with respect to the (111) surface were observed in the low temperature regime. Furthermore, using facet-sensitive dark-field LEEM, spatial and size distributions of specific facets were studied for the different temperatures. Moreover, the facet dimensions were statistically analyzed. The total island size of the facets follows an exponential distribution, indicating a random growth mode in absence of any mutual facet interactions. While the length distribution of the facets also follows an exponential distribution, the width distribution is peaked, reflecting the high degree of lateral order. This anisotropy is temperature-dependent and occurs starting above 478 K substrate temperature during growth. The peaked distribution indicates the presence of a long-range interaction which leads to the structural order of the self-organized grating. The origin of this long-range interaction was investigated combining three complementary in-situ methods, all providing new insights into the formation of faceted organic-metal interfaces: the cantilever bending technique, high-resolution low energy electron diffraction (SPA-LEED), and microscopy (LEEM). Finally, template-assisted growth of lateral, heterorganic nanostructures has been explored. Therefore, self-assembled monolayers as a second archetype class of molecules were grown on partially covered PTCDA/Ag(10 8 7) interfaces. (orig.)}
place = {Germany}
year = {2009}
month = {Jan}
}