A5011473781- Surface Chemistry and Catalysis
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Surface and Thin Film Phenomena
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Copper Interconnects and Reliability
- Advanced Thermoelectric Materials and Devices
- ZnO doping and properties
- Moringa oleifera research and applications
- Magnetic properties of thin films
- nanoparticles nucleation surface interactions
- Plasma Diagnostics and Applications
- Mesoporous Materials and Catalysis
- Advanced Fiber Optic Sensors
- Gestational Trophoblastic Disease Studies
- Metallurgy and Cultural Artifacts
- Advanced ceramic materials synthesis
- Ion-surface interactions and analysis
- Advanced Photocatalysis Techniques
- Agroforestry and silvopastoral systems
- Induction Heating and Inverter Technology
- Organic Electronics and Photovoltaics
- GaN-based semiconductor devices and materials
TU Wien
2025
University of Vienna
2018-2023
Universidad Yachay Tech
2018-2020
University of Groningen
2013-2019
Consejo Nacional de Investigaciones Científicas y Técnicas
2007-2016
Instituto de Física del Litoral
2016
National University of the Littoral
2016
Instituto de Desarrollo Tecnológico para la Industria Química
2007-2013
Bariloche Atomic Centre
2013
Balseiro Institute
2013
The epitaxial growth of graphene on catalytically active metallic surfaces via chemical vapor deposition (CVD) is known to be one the most reliable routes toward high-quality large-area graphene. This CVD-grown generally coupled its support resulting in a modification intrinsic properties. Growth oxides promising alternative that might lead decoupled layer. Here, we compare pure an oxidized copper surface both cases grown by single step CVD process under similar conditions. Remarkably,...
The self‐assembly of cyano‐substituted triarylamine derivatives on Au(111) is studied with scanning tunneling microscopy and density functional theory calculations. Two different phases, each stabilized by at least two cyano bonding motifs are observed. In the first phase, molecule involved in dipolar coupling hydrogen bonding, while second coupling, metal‐ligand interactions present. Interestingly, metal–ligand bond already observed for deposition molecules sample kept room temperature...
The periodic herringbone reconstruction on the surface of Au(111) consists alternating face-centered-cubic (fcc) and hexagonal-closed-packed (hcp) sites separated by dislocation lines elbows. This well-known arrangement acts as an electronic superlattice for surface-state electrons, creating a mini-gapped band structure with modulated density. rich fascinating geometrical landscape has countless times served platform molecular self-assembly on-surface synthesis carbon-based nanoarchitectures...
The self-assembly of 1,3,5-benzenetribenzoic acid (BTB) molecules on both Cu(111) and epitaxial graphene grown were studied by scanning tunneling microscopy (STM) low-energy electron diffraction (LEED) under ultrahigh vacuum conditions. On Cu(111), the BTB found to mainly arrange in close-packed structures through H-bonding between (partially) deprotonated carboxylic groups. In addition, porous formed intact molecules-and also based H-bonding-were observed. form accompanied small patches...
Abstract Minor structural changes in transition metal dichalcogenides can have dramatic effects on their electronic properties. This makes the quest for key parameters that enable a selective choice between competing metallic and semiconducting phases 2D MoTe 2 system compelling. Herein, we report optimal conditions at which of initial seed layer dictates type crystal structure atomically-thin films grown by chemical vapour deposition (CVD). When Mo is used as layer, 2H-MoTe only product....
Abstract The self‐assembly of cyano‐functionalized triarylamine derivatives on Cu(111), Ag(111) and Au(111) was studied by means scanning tunnelling microscopy, low‐energy electron diffraction, X‐ray photoelectron spectroscopy density functional theory calculations. Different bonding motifs, such as antiparallel dipolar coupling, hydrogen metal coordination, were observed. Whereas only one hexagonally close‐packed pattern stabilized is observed, two different partially porous phases are...
We report the formation of one- and two-dimensional metal–organic coordination structures from para-hexaphenyl-dicarbonitrile (NC–Ph6–CN) molecules Cu atoms on graphene epitaxially grown Ir(111). By varying stoichiometry between NC–Ph6–CN atoms, dimensionality could be tuned: for a 3:2 ratio, hexagonal porous network based threefold was observed, while 1:1 one-dimensional chains twofold were formed. The metal–ligand bonds supported by imaging within with scanning tunneling microscopy....
Surface diffusion, molecular conformation, and on-surface coupling reactions are key processes for building tailored nanostructures such as graphene nanoribbons, polycyclic aromatic hydrocarbons, one-dimensional/two-dimensional (2D) polymers. Here, we study the surface diffusion in situ of a chlorinated porphyrin, namely 5,10,15,20-tetrakis(4-chlorophenyl)porphyrin (Cl4TPP), using combined scanning tunneling microscopy (STM), density functional theory (DFT), X-ray photoelectron spectroscopy...
Metal adatoms play a key role in surface diffusion, adsorption conformation, and self-assembly of porphyrin molecules on metal surfaces. Herein, we study the specific influence coadsorption Fe, Co, Pd atoms behavior 2H-tetrakis(p-cyano)phenylporphyrin (2H-TCNPP) Cu(111) using scanning tunneling microscopy. Upon co-deposition Fe form one-dimensional (1D) linear chains after mild annealing driven by interaction its cyano groups with adatoms. A similar has been observed previously Cu(111),...
Scanning probe microscopy has become an essential tool to not only study pristine surfaces but also on-surface reactions and molecular self-assembly. Nonetheless, due inherent limitations, some atoms or (parts of) molecules are either imaged cannot be unambiguously identified. Herein, we discuss the arrangement of two different nonplanar assemblies para-hexaphenyl-dicarbonitrile (Ph6(CN)2) on Au(111) based a combined theoretical experimental approach. For deposition Ph6(CN)2 kept at room...
In this study we present results concerning the early growth stages of an insulator-metal interface by means scanning tunneling microscopy. We report aluminum fluoride $({\text{AlF}}_{3})$ films over a Cu(100) surface at room temperature, from submonolayer coverages up to 1.25 monolayers. Scanning microscopy (STM) measurements reveal that islands undergo shape transition very low coverages, compact fractal-like, as they grow in size. These fractal-like cover substrate with single monolayer...
We have studied the initial stages of adsorption N,N′-bis(1-ethylpropyl)-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 EP-PTCDI molecules initially absorb surface, forming ordered islands, without preferential nucleation at step-edges terraces as is case for same molecule Ag(111). The 2D...
The on-surface synthesis of atomically flat N-doped graphene on oxidized copper is presented. Besides circumventing the almost standard use metallic substrates for growth, this method allows producing with ∼2.0 at % N in a substitutional configuration directly decoupled from substrate. Angle-resolved photoemission shows linear energy-momentum dispersion where Dirac point lies Fermi level. Additionally, functional centers can be selectively tailored sp2 by making purpose-made molecular...
The thermal stability of N,N′-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) thin films deposited on Cu(100) has been characterized by using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and low-energy electron diffraction (LEED). For one monolayer absorption, the molecules arrange with a (34−26) symmetry. After annealing sample at 500 K, XPS measurements show that dissociate leaving PTCDI core molecule surface. According to that, STM new...
A steady and durable transition from rough randomly oriented 2D aluminum fluoride clusters to ultra‐thin films with defined arrangement is here reported. Scanning tunneling microscopy images show that the material deposited on top of Cu(100) reveals a smooth surface preferential in morphology islands after performing post‐deposition annealing treatment at 575 K. X‐ray photoelectron spectroscopy shows chemical environment atoms remains unaltered treatments this temperature. However, voltage...
A comparative study on the self-assembly of sexiphenyl-dicarbonitrile highly oriented pyrolytic graphite and single-layer graphene Cu(111) is presented. Despite an overall low molecule-substrate interaction, close-packed structures exhibit a peculiar shift repeating every four to five molecules. This has hitherto not been reported for similar systems hence unique feature induced by graphitic substrates.
Abstract In this study we present results concerning the early growth stages of an insulator‐metal interface by means scanning tunnelling microscopy. particular, report aluminium fluoride ( AlF 3 ) islands over a Cu (100) surface at room temperature, from sub‐monola‐yer coverages up to 1.25 monolayers. These cover substrate with single monolayer film depositions 0.80 monolayers, 3D beyond coverage. High voltages (V ≥ 2.50 V) are needed obtain STM images, showing insulator character islands....
The self-assembly of a planarized cyanosubstituted heterotriangulene on Au(111) is reported by K. Müller, M. Kivala, Stöhr, and co-workers in article 1300025. complex interplay intermolecular molecule/substrate interactions leads to the development different chiral phases, stabilized combination dipolar coupling, hydrogen bonding, metal–ligand interactions. Au substrate interacts with cyano ligands affecting both molecular conformation adsorption geometry.