A5051798685- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Graphene research and applications
- Porphyrin and Phthalocyanine Chemistry
- Advanced Chemical Physics Studies
- Fullerene Chemistry and Applications
- Organic Electronics and Photovoltaics
- Chemical and Physical Properties of Materials
- Quantum Dots Synthesis And Properties
- Electrochemical Analysis and Applications
- Machine Learning in Materials Science
- Catalysis and Oxidation Reactions
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Catalytic Processes in Materials Science
- Quantum and electron transport phenomena
- Electron and X-Ray Spectroscopy Techniques
- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Theoretical and Computational Physics
- Advancements in Photolithography Techniques
- Physics of Superconductivity and Magnetism
Istituto Officina dei Materiali
2023-2025
University of Ljubljana
2011-2024
AREA Science Park
2006-2020
University of British Columbia
2009
Technical University of Munich
2009
Max Planck Institute of Quantum Optics
2009
Istituto Nazionale per la Fisica della Materia
2001-2005
Jožef Stefan Institute
2001-2005
University of Trieste
2004
The structure of ultrathin Cu-phthalocyanine (Cu-Pc) films on the (1 × 2)-Au(110) surface has been studied. overlayer deposition monitored in real time by helium atom scattering (HAS) and low energy electron diffraction (LEED). Throughout monolayer regime Cu-Pc molecules are systematically observed to line-up edge-to-edge along [11̅0] direction Au substrate, yielding a commensurate 5-fold periodicity (14.4 Å). chains deconstruct 2-fold missing row order early stage deposition. A set higher...
We present a combined multimethod experimental and theoretical study of the geometric electronic properties Co-tetraphenyl-porphyrin (Co-TPP) molecules adsorbed on Ag(111) surface. Scanning tunneling microscopy (STM) topographs reveal that Co-TPP forms highly regular arrays with square unit cell. Hereby, do not occupy unique adsorption site atomic lattice. The central Co atom is found to reside predominantly above fcc hcp hollow sites substrate, as determined from photoelectron diffraction...
We present a combined study of the adsorption and ordering l-tyrosine amino acid on close-packed Ag(111) noble-metal surface in ultrahigh vacuum by means low-temperature scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) near-edge absorption fine structure (NEXAFS) spectroscopy. On this substrate biomolecules self-assemble at temperatures exceeding 320 K into linear structures primarily following specific crystallographic directions evolve with larger molecular...
We have studied the growth of pentacene molecules on unreconstructed and stoichiometric surface TiO2(110). At variance with its characteristic homeotropic mode, is found to be physisorbed this dielectric substrate long molecular axis oriented parallel aligned along [001] direction. Pentacene couple side-by-side into stripes running [11̅0] direction, where overlayer preserves lattice periodicity (∼6.5 Å). In opposite head-to-head repulsion drives ordering stripes, whose spacing simply depends...
We studied the molecular orientation of pentacene monolayer phases on Au(110) surface by means near-edge X-ray absorption spectroscopy at carbon K-shell and scanning tunneling microscopy. The highest coverage phase, displaying a (6 x 8) symmetry, is found to be formed two types differently oriented molecules mimicking regular arrays nanorails. Flat-lying molecules, aligned side-by-side with long axis along [001] direction, form crosstie chains extending in [110] direction. In between...
The self-assembly of the amino acid L-methionine on Cu(111) was investigated under ultrahigh vacuum (UHV) conditions by scanning tunneling microscopy (STM), helium atom scattering (HAS) and X-ray photoelectron spectroscopy (XPS). system is strongly influenced substrate reactivity deposition temperature. STM HAS structural analysis yields that, for temperatures below 273 K, biomolecules assemble in strings oriented with an angle −10° respect to ⟨110⟩ axes substrate. For above 283 a regular...
The structure of ultrathin Cu−phthalocyanine (Cu−Pc) film on Au(110) has been studied by means several diffraction tecniques: helium atom scattering (HAS), low energy electron (LEED) and grazing incidence X-ray (GIXD). HAS used to measure the long range order organic overlayer, whereas LEED at 200 eV probe corresponding substrate reconstruction. At monolayer coverage, displays a reconstruction with 3-fold periodicity along [001] direction, whose out plane GIXD variable polarization...
The surface reduction of rutile TiO2(110) generates a state in the band gap whose excess electrons are spread among multiple sites, making conductive and reactive. charge extraction, hence catalytic properties, depends critically on spatial extent redistribution, which has been hitherto probed by small molecules that recombine at oxygen vacancy (Ovac) sites. We demonstrate valence resonant photoemission (RESPES) very general extraction mechanism from reduced to an extended electron-acceptor...
The efficiency of interfacial charge transfer for photovoltaic and photocatalytic applications metal-tetraphenylporphyrins (M-TPPs) on rutile TiO2(110) is governed by the molecular adsorption site configuration. Although nitrogen-chelated metals in oxidation state (II) display a different tendency to axial coordination at porphyrin centre, we found that M(II)-TPPs with M = Co, Ni, Cu, Zn adsorb Obr rows same conformation they aggregate into commensurate phase symmetry. According density...
We studied the growth of pentacene (C22H14) on Au(110) surface by means He atom scattering and Synchrotron X-ray photoemission. found that two-dimensional commensurate only occurs in monolayer range for a substrate temperature, T(s), higher than approximately 370 K. Larger amounts deposited molecules forms three-dimensional uncorrelated clusters wetting layer. The desorption second layer at T(s) > or = 420 highest coverage ordered phase displays (6 x 8) symmetry corresponds to saturation (3...
We have studied the deposition of perylene-tetracarboxylic-diimide, PTCDI, on rutile (1 × 1)-TiO2(110) surface. At variance with other polyaromatic hydrocarbons, like acenes, PTCDI displays a significant interaction this dielectric substrate. moderate substrate temperature (∼400 K), first layer molecules aggregate into two-dimensional islands corresponding to 5) commensurate phase. According our surface diffraction, STM, and NEXAFS studies, accommodates one molecule per unit cell, atop each...
We investigate bidirectional femtosecond charge transfer dynamics using the core-hole clock implementation of resonant photoemission spectroscopy from 4,4'-bipyridine molecular layers on three different surfaces: Au(111), epitaxial graphene Ni(111), and nanoribbons. show that lowest unoccupied orbital (LUMO) molecule drops partially below Fermi level upon creation in all systems, opening an additional decay channel for core-hole, involving electron donation substrate to molecule....
Growing attention has been drawn in the past years to \alpha-phase (1/3 monolayer) of Sn on Ge(111), which undergoes a transition from low temperature (3x3) phase room (\sqrt3 x \sqrt3)R30 one. On basis scanning tunnelling microscopy experiments, this was claimed be manifestation surface charge density wave (SCDW), i.e. periodic redistribution charge, possibly accompanied by lattice distortion, determines change symmetry. As further experiments with different techniques were being performed,...
The work function W of Mo(6)S(3)I(6) molecular nanowires is determined by Kelvin probe (KP) measurements, UV photoelectron spectroscopy (UPS), and cyclic voltammetry (CV). values obtained all three methods agree well, giving = 4.8 ± 0.1 eV. CV measurements also give a gap between the highest occupied orbital (HOMO) lowest unoccupied (LUMO) E(g) 1.2 eV, in agreement with recent optical but disagreement theoretical calculations, which predict material to be metal. electronic structure suggests...
We assess ultrafast charge transfer dynamics between molecules and epitaxial or bilayer graphene/Ni(111) interfaces by <italic>ab initio</italic> theory X-ray spectroscopy.
We deposit azafullerene C59N• radicals in a vacuum on the Au(111) surface for layer thicknesses between 0.35 and 2.1 monolayers (ML). The layers are characterized using X-ray photoemission (XPS) absorption fine structure (NEXAFS) spectroscopy, low-temperature scanning tunneling microscopy (STM), by density functional calculations (DFT). singly unoccupied C59N orbital (SUMO) has been identified N 1s NEXAFS/XPS spectra of as spectroscopic fingerprint molecular radical state. At low coverages...
Coordination polymers may be synthesized by linear bridging ligands to metal ions with conventional chemistry methods (e.g. in solution). Such complexes can hardly brought onto a substrate the chemical, spatial and geometrical homogeneity required for device integration. Instead, we follow an situ synthesis approach, where anchoring points are provided monolayer of metal(II)-tetraphenylporphyrin (M-TPP, M = Cu, Zn, Co) grown vacuum on rutile-TiO2(110) surface. We probed affinity axial...
<title>Abstract</title> We present an efficient strategy for on-surface engineering of organic metal-free supramolecular complexes with long-term spin protection. By vacuum deposition azafullerene (C59N•) monomers on a pre-deposited template layer [10]cycloparaphenylene ([10]CPP) nanohoops Au(111) surface we exploit the molecular shape matching between C59N• and [10]CPP encapsulation in guest-host complexation geometry. C59N•⊂[10]CPP self-assemble into extended two-dimensional hexagonal...
At a coverage of $5∕3$ monolayer (ML), Pb adsorbed on Ge(001) forms ground phase displaying $(\genfrac{}{}{0}{}{2\phantom{\rule{0.3em}{0ex}}1}{0\phantom{\rule{0.3em}{0ex}}6})$ symmetry. This undergoes two reversible transitions $(\genfrac{}{}{0}{}{2\phantom{\rule{0.3em}{0ex}}1}{0\phantom{\rule{0.3em}{0ex}}6})\ensuremath{\leftrightarrow}(\genfrac{}{}{0}{}{2\phantom{\rule{0.3em}{0ex}}1}{0\phantom{\rule{0.3em}{0ex}}3})\ensuremath{\leftrightarrow}(2\ifmmode\times\else\texttimes\fi{}1)$ at the...
In this paper we present helium atom scattering -a non-destructive technique used to study the surface structure and lattice dynamics (phonons) of clean adsorbate-covered surfaces.We review fundamentals elastic inelastic theory describe basic components He apparatus as well its operation.We then demonstrate use in three areas analysis: determination Ge(001) surface, overlayer Pb/Ge(001) thin film, morphology/structure examination organic overlayers pentacene/Au(110).