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@PHDTHESIS{Mercurio:819720,
author = {Mercurio, Giuseppe},
title = {{S}tudy of {M}olecule-{M}etal {I}nterfaces by {M}eans of
the {N}ormal {I}ncidence {X}-ray {S}tanding {W}ave
{T}echnique},
volume = {49},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2016-05321},
isbn = {978-89336-816-7},
series = {Schriften des Forschungszentrum Jülich. Reihe
Schlüsseltechnologien/ Key Technologies},
pages = {XXII, 361 S.},
year = {2012},
note = {RWTH Aachen, Diss., 2012},
abstract = {This work investigates the geometric and chemical
properties of different moleculemetal interfaces, relevant
to molecular electronics and functional surfaces
applications, by means of the normal incidence x-ray
standing wave (NIXSW) technique. All NIXSW data are analysed
by means of the newly developed open-source program
Torricelli, which is thoroughly documented in the thesis. In
order to elucidate the role played by the substrate within
molecule-metal interfaces, the prototype organic molecule
3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on the
Ag(110) surface is investigated. The molecule results more
distorted and at smaller bonding distances on the more
reactive Ag(110) surface, in comparison with the
Ag(100)$^{1}$ and the Ag(111)$^{2}$ substrates. This
conclusion follows from the detailed molecular adsorption
geometry obtained from the differential analysis of both
carbon and oxygen atoms. Subsequently, the chemisorptive
PTCDA/Ag(110) interaction is tuned by the codeposition of an
external alkali metal, namely K. As a consequence, the
functional groups of PTCDA unbind from the surface, which,
in turn, undergoes major reconstruction. In fact, the
resulting nanopatterned surface consists of alternated up
and down reconstructed Ag terraces covered by PTCDA
molecules partly unbound with respect to the pure molecular
phase. Within the context of the functional surfaces, the
interaction of the molecular switches azobenzene (AB) and
3,3,5,5-tetra-tert-butyl-azobenzene (TBA) adsorbed on the
Ag(111) surface is investigated. The bonding distance of
TBA, only slightly greater compared to AB, indicates that
the desired geometric decoupling of the photochromic moiety
to enable the switching in the adsorbate state does not
occur.$^{3}$ In [...]},
cin = {PGI-3},
cid = {I:(DE-Juel1)PGI-3-20110106},
pnm = {142 - Controlling Spin-Based Phenomena (POF3-142)},
pid = {G:(DE-HGF)POF3-142},
typ = {PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/819720},
}