A5011454444- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Graphene research and applications
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Fullerene Chemistry and Applications
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Quantum and electron transport phenomena
- Adhesion, Friction, and Surface Interactions
- Carbon Nanotubes in Composites
- Advanced Electron Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Organic Electronics and Photovoltaics
- Graphene and Nanomaterials Applications
- Ion-surface interactions and analysis
- Supramolecular Self-Assembly in Materials
- Synthesis and Properties of Aromatic Compounds
- Copyright and Intellectual Property
- Porphyrin and Phthalocyanine Chemistry
- Metal and Thin Film Mechanics
- Catalytic Alkyne Reactions
- Advanced Memory and Neural Computing
- Microfluidic and Capillary Electrophoresis Applications
- Electrohydrodynamics and Fluid Dynamics
Palacký University Olomouc
2017-2025
Regional Centre of Advanced Technologies and Materials
2017-2025
Nanomaterials and Nanotechnology Research Center
2024-2025
Czech Academy of Sciences
2017-2024
Aix-Marseille Université
2024
Centre Interdisciplinaire de Nanoscience de Marseille
2024
Czech Academy of Sciences, Institute of Physics
2017-2023
Universidad Autónoma de Madrid
2012-2020
An anisotropic charge distribution on individual atoms, such as σ-holes, may strongly affect the material and structural properties of systems. However, spatial resolution distributions an atom represents a long-standing experimental challenge. In particular, existence σ-hole halogen atoms has been demonstrated only indirectly through determination crystal structures organic molecules containing halogens or with theoretical calculations, consequently calling for its direct visualization. We...
Abstract Nitrogen doping of graphene significantly affects its chemical properties, which is particularly important in molecular sensing and electrocatalysis applications. However, detailed insight into interaction between N-dopant molecules at the atomic scale currently lacking. Here we demonstrate control over spin state a single iron(II) phthalocyanine molecule by positioning on N-doped graphene. The transition was driven weak intermixing orbitals with z -component ( p N-dopant) d xz , yz...
Engineering low-band-gap π-conjugated polymers is a growing area in basic and applied research. The main synthetic challenge lies the solubility of starting materials, which precludes advancements field. Here, we report an on-surface synthesis protocol to overcome such difficulties produce poly(p-anthracene ethynylene) molecular wires on Au(111). To this aim, quinoid anthracene precursor with =CBr
The synthesis of polycyclic aromatic hydrocarbons containing various non-benzenoid rings remains a big challenge facing contemporary organic chemistry despite considerable effort made over the last decades. Herein, we present novel route, employing on-surface chemistry, to synthesize nonalternant up four distinct kinds rings. We show that surface-induced mechanical constraints imposed on strained helical reactants play decisive role leading formation products, energetically unfavorable in...
Abstract Carbon nanostructures with zigzag edges exhibit unique properties—such as localized electronic states and spins—with exciting potential applications. Such however are generally synthesized under vacuum because their unstable ambient conditions: a barrier that must be surmounted to achieve scalable integration into devices for practical purposes. Here we show two chemical protection/deprotection strategies, demonstrated on labile, air-sensitive chiral graphene nanoribbons. Upon...
Here we show scanning tunnelling microscopy (STM), non-contact atomic force (AFM) and inelastic electron spectroscopy (IETS) measurements on organic molecule with a CO- terminated tip at 5K. The high-resolution contrast observed simultaneously in all channels unam- biguously demonstrates the common imaging mechanism STM/AFM/IETS, related to lateral bending of CO-functionalized tip. IETS reveals that submolecular con- trast 5K consists both renormalization vibrational frequency variation...
On-surface chemistry in ultrahigh vacuum offers complementary routes for synthesizing molecular complexes that cannot be accessed through standard solution chemistry. The presence of a surface not only imposes spatial two-dimensional restraints but also frequently acts as source adatoms actively participating the chemical reactions. Here we demonstrate formation gold porphyrin derivatives via thermally induced transformations fluorinated free-base porphyrin, 2H-4FTPP, on Au(111) surface,...
We report on the synthesis and characterization of atomically precise one-dimensional diradical peripentacene polymers a Au(111) surface. By means high-resolution scanning probe microscopy complemented by theoretical simulations, we provide evidence their magnetic properties, which arise from presence two unpaired spins at termini. Additionally, transition properties related to length polymer. Peripentacene dimers exhibit an antiferromagnetic (S=0) singlet ground state. They are...
Chemical transformation of polyaromatic hydrocarbon (PAH) molecules following different reaction strategies has always been the focus organic synthesis. In this work, we report synthesis a PAH molecule, formation which consists an unusual C-C bond cleavage accompanied by complex π-conjugated molecular scaffold rearrangement. We demonstrate that chemical is steered concerted motion individual Au0 gold atoms on supporting Au(111) surface. This observation underpins importance single-atom...
On-surface synthesis under ultra-high vacuum (UHV) conditions facilitates the fabrication of unique molecular compounds, replicating established in-solution protocols.
Submolecular charge distribution significantly affects the physical-chemical properties of molecules and their mutual interaction. One example is presence a π-electron-deficient cavity in halogen-substituted polyaromatic hydrocarbon compounds, so-called π-holes, existence which was predicted theoretically, but direct experimental observation still missing. Here we present resolution π-hole on single molecule using Kelvin probe force microscopy, supports theoretical prediction its existence....
The development of synthetic strategies to engineer \pi-conjugated polymers is paramount importance in modern chemistry and materials science. Here we introduce a theoretical experimental paradigm based on the search for specific vibrational modes through an appropriate tailoring \pi-conjugation precursors, order increase attempt frequency chemical reaction. First, on-surface design 1D polymer with \pi-topology, which bisanthene monomers linked by cumulene bridges that tune modes. In second...
Quantum phase transitions (QPTs) driven by quantum fluctuations are between distinct phases of matter. At present, they poorly understood and not readily controlled. Here, scanning tunneling microscopy (STM) noncontact atomic force (nc-AFM) used to explore scale control over two different topological states a well-defined π-conjugated polymer. The transition is pseudo Jahn-Teller effect that activated above certain polymer chain length. In addition, theoretical calculations indicate the...
One-dimensional (1D) metalloporphyrin polymers can exhibit magnetism, depending on the central metal ion and surrounding ligand field. The possibility of tailoring magnetic signal in such nanostructures is highly desirable for potential spintronic devices. We present low-temperature (4.2 K) scanning tunneling microscopy spectroscopy (LT-STM/STS) combination with high-resolution atomic force (AFM) a density functional theory (DFT) study two-step synthetic protocol to grow robust...
Halogen bonding (HB) has emerged as a promising route for designing supramolecular assemblies due to its directional nature and versatility in modifying interactions through the choice of halogens molecular entities. Despite this, methods tuning these on surfaces, particularly terms directionality, are limited. In this study, we present strategy directionality self-assembly processes homomolecular organic compounds inert metal surfaces. A variety halogen-halogen geometries can promote...
Abstract The atomically precise control over the size, shape and structure of nanographenes (NGs) or introduction heteroatom dopants into their sp 2 ‐carbon lattice confer them valuable electronic, optical magnetic properties. Herein, we report on design synthesis a hexabenzocoronene derivative embedded with graphitic nitrogen in its honeycomb lattice, achieved via on‐surface assisted cyclodehydrogenation Au(111) surface. Combined scanning tunnelling microscopy/spectroscopy non‐contact...
Realization of topological quantum states in carbon nanostructures has recently emerged as a promising platform for hosting highly coherent and controllable dot spin qubits. However, their adjustable manipulation remains elusive. Here, we report the atomically accurate control hybridization level topologically protected edge emerging from interfaces bottom-up-fabricated π-conjugated polymers. Our investigation employed combination low-temperature scanning tunneling microscopy spectroscopy,...
Glycans, consisting of covalently linked sugar units, are a major class biopolymers essential to all known living organisms. To better understand their biological functions and further applications in fields from biomedicine materials science, detailed knowledge structure is essential. However, due the extraordinary complexity conformational flexibility glycans, state-of-the-art glycan analysis methods often fail provide structural information with atomic precision. Here, we combine...
Tuning the chemical properties of graphene by controlled doping is a widely investigated strategy. The effect substitutional single dopant on local reactivity much less explored. To improve understanding role p- and n-type dopants in graphene's activity quantification its interaction with molecules, we report an atomic-scale investigation boron (B) nitrogen (N) their interactions CO molecules means atomic force microscopy (AFM) Kelvin probe (KPFM) experiments theoretical calculations. We...
The single molecule magnet (SMM) bis(phthalocyaninato)terbium (III) (TbPc$_2$) has attracted steady research attention as an exemplar system for realizing molecule-based spin electronics. In this paper, we report on the spontaneous formation of Tb$_2$Pc$_3$ species from TbPc$_2$ precursors via sublimation in ultrahigh vacuum (UHV) onto Ag(111) surface. molecules surface are inspected using combined scanning tunneling (STM) and non-contact atomic force microscopies (nc-AFM) at 5 Kelvin....
We show that noncontact atomic force microscopy (AFM) is sensitive to the local stiffness in atomic-scale limit on weakly coupled 2D materials, as graphene metals. Our large amplitude AFM topography and dissipation images under ultrahigh vacuum low temperature resolve moir\'e patterns Pt(111), despite its extremely geometric corrugation. The imaging mechanisms are identified with a multiscale model based density-functional theory calculations, where energy cost of global deformations...
Understanding the nucleation and growth kinetics of thin films is a prerequisite for their large-scale utilization in devices. For self-assembled molecular phases near thermodynamic equilibrium nucleation–growth kinetic models are still not developed. Here, we employ real-time low-energy electron microscopy (LEEM) to visualize phase transformation induced by carboxylation 4,4′-biphenyl dicarboxylic acid on Ag(001) under ultra-high-vacuum conditions. The initial (α) transformed (β)...