Rémy Pawlak

Rémy Pawlak
University of Basel | UNIBAS · Department of Physics

PhD in Physics, Material Science, Nanoscience

About

110
Publications
23,753
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2,923
Citations
Additional affiliations
February 2010 - present
University of Basel
Position
  • PostDoc Position
October 2006 - December 2009
Aix-Marseille Université
Position
  • PhD

Publications

Publications (110)
Article
Crystalline nanoporous molecular networks are assembled on the Ag(111) surface, where the pores confine electrons originating from the surface state of the metal. Depending on the pore sizes and their coupling, an antibonding level is shifted upward by 0.1-0.3 eV as measured by scanning tunneling microscopy. On molecular sites, a downshifted bondin...
Preprint
Full-text available
Molecular self-assembly plays a very important role in various aspects of technology as well as in biological systems. Governed by the covalent, hydrogen or van der Waals interactions - self-assembly of alike molecules results in a large variety of complex patterns even in two dimensions (2D). Prediction of pattern formation for 2D molecular networ...
Article
The structural and superlubric properties of single layer MoS2 on Au(111) forming moiré superlattice structures have been investigated by means of ultrahigh vacuum atomic force microscope with bimodal and contact modes. We synthesize epitaxial monolayer MoS2 flakes on the Au(111) surface in ultrahigh vacuum. Using friction force microscopy, atomic...
Article
A combination of low temperature atomic force microcopy and molecular dynamic simulations is used to demonstrate that soft designer molecules realize a sidewinding motion when dragged over a gold surface. Exploiting their longitudinal flexibility, pyrenylene chains are indeed able to lower diffusion energy barriers via on-surface directional lockin...
Preprint
Periodic confinement of surface electrons in atomic structures or extended nanoporous molecular networks is the archetype of a two-dimensional quantum dot (QD) superlattice. Yet, an electrical control of such an artificial lattice by external gating has never been demonstrated. Here we show the capacitive coupling between an atomic force microscope...
Preprint
Full-text available
Obtaining a robust superconducting state in atomically precise nanographene (NG) structures by proximity to a superconductor could foster the discovery of topological superconductivity in graphene. On-surface synthesis of such NGs has been achieved on noble metals or metal oxides, however, it is still absent on superconductors. Here, we present a s...
Article
Full-text available
Topological superconductivity emerging in one- or two-dimensional hybrid materials is predicted as a key ingredient for quantum computing. However, not only the design of complex heterostructures is primordial for future applications but also the characterization of their electronic and structural properties at the atomic scale using the most advan...
Article
On-surface chemical reaction has become a very powerful technique to synthesize nanostructures by linking small molecules in the bottom-up approach. Given the fact that most reactants are simultaneously activated at certain temperatures, a sequential reaction in a controlled way has remained challenging. Here, we present an on-surface synthesis of...
Article
On‐surface chemical reaction has become a very powerful technique to synthesize nanostructures by linking small molecules in the bottom‐up approach. Given the fact that most reactants are simultaneously activated at certain temperatures, a sequential reaction in a controlled way has remained challenging. Here, we present an on‐surface synthesis of...
Preprint
Full-text available
Background: Topological superconductivity emerging in one- or two-dimensional hybrid materials is predicted as a key ingredient for quantum computing. However, not only the design of complex heterostructures is primordial for future applications but also the characterization of their electronic and structural properties at the atomic scale using th...
Article
Die Silylen‐verknüpfte Sonogashira‐Kreuzkupplung ermöglicht die Synthese von partiell fluorierten Phenylenethinylen‐Oligomeren auf Ag(111), wie Akihiro Orita, Shigeki Kawai et al in ihrer Zuschrift berichten (DOI: 10.1002/ange.202102882). Die desilylierende Sonogashira‐Reaktion erreicht eine hohe Chemoselektivität von bis zu 75 %, während die konku...
Article
On-surface synthesis is a powerful method for the fabrication of π-conjugated nanomaterials. Herein, we demonstrate chemoselective Sonogashira coupling between (trimethylsilyl)ethynyl and chlorophenyl groups in silylethynyl- and chloro-substituted partially fluorinated phenylene ethynylenes (SiCPFPEs) on Ag(111). The desilylative Sonogashira coupli...
Article
On‐surface synthesis is a powerful methodology for the fabrication of π‐conjugated nanomaterials. Here, we demonstrate chemoselective Sonogashira coupling between trimethylsilyl(TMS)ethynyl and chloropheny groups in silylethynyl‐ and chloro‐substituted partially fluorinated phenylene–ethynylenes (SiCPFPEs) on Ag(111). The desilylative Sonogashira c...
Article
A coupling module composed of (trimethylsilyl)ethynyl and chlorophenyl groups selectively accelerated sluggish desilylative on-surface Sonogashira coupling with homocoupling efficiently suppressed. Bond-resolved scanning tunneling microscopy/atomic force microscopy (STM/AFM) with a CO-functionalized tip enabled investigation of this coupling reacti...
Article
Metallorganische Gerüste Im Forschungsartikel auf S. 8451 berichten Natalia B. Shustova et al. über heterometallische photoresponsive metallorganische Gerüste sowie über die gezielte Einstellung ihrer elektronischen Eigenschaften.
Article
Metal–Organic Frameworks In their Research Article on page 8370, Natalia B. Shustova et al. report on heterometallic actinide‐containing photoresponsive metal–organic frameworks and the tuning of their electronic properties.
Article
Nitrogen‐doped Kagome graphene is predicted to display a topological band gap and unconventional superconductivity. Two‐dimensional graphene sheets possessing a long‐range honeycomb Kagome lattice have now been synthesized by a substrate‐assisted Ullmann reaction on Ag(111). Scanning probe microscopy supported by density functional theory proves th...
Article
Nitrogen‐doped Kagome graphene (N‐KG) has been theoretically predicted as a candidate for the emergence of a topological band gap as well as unconventional superconductivity. However, its physical realization still remains very limited. Here, we report on the substrate‐assisted reaction on Ag(111) for the synthesis of two‐dimensional graphene sheet...
Chapter
Controlling friction on the nanometer scale is one of nowadays’ challenges for scientists and engineers. Since the first observation of atomic friction reported by Mate et al. for a tungsten tip sliding on graphite, a lot of progress has been made in the understanding of this phenomenon on the atomic scale. An accurate description of the motion of...
Article
Full-text available
Although methods for a periodic perforation and heteroatom doping of graphene sheets have been developed, patterning closely spaced holes on the nanoscale in graphene nanoribbons is still a challenging task. In this work, nitrogen-doped porous graphene nanoribbons (N-GNRs) were synthesized on Ag(111) using a silver-assisted Ullmann polymerization o...
Article
Full-text available
Recent advances in state-of-the-art probe microscopy allow us to conduct single molecular chemistry via tip-induced reactions and direct imaging of the inner structure of the products. Here, we synthesize three-dimensional graphene nanoribbons by on-surface chemical reaction and take advantage of tip-induced assembly to demonstrate their capability...
Article
Full-text available
Thermal expansion, the response in shape, area or volume of a solid with heat, is usually large in molecular materials compared to their inorganic counterparts. Resulting from the intrinsic molecule flexibility, conformational changes or variable intermolecular interactions, the exact interplay between these mechanisms is however poorly understood...
Article
Full-text available
Bending and twisting around carbon-carbon single bonds are ubiquitous in natural and synthetic polymers. Force-induced changes were so far not measured at the single-monomer level, owing to limited ways to apply local forces. We quantified down to the sub-molecular level the mechanical response within individual poly-pyrenylene chains upon their de...
Article
Full-text available
The atomic buckling in 2D “Xenes” (such as silicene) fosters a plethora of exotic electronic properties such as a quantum spin Hall effect and could be engineered by external strain. Quantifying the buckling magnitude with subangstrom precision is, however, challenging, since epitaxially grown 2D layers exhibit complex restructurings coexisting on...
Article
Low temperature measurements of the tunneling current as a function of the applied bias voltage have been performed on a dense constant-height grid above individual copper phthalocyanine molecules adsorbed on a Cu(111) surface. By appropriate tuning of the applied bias, the molecule can be reversibly switched between two configurations in which pai...
Preprint
Full-text available
Majorana fermions have recently garnered a great attention outside the field of particle physics, in condensed matter physics. In contrast to their particle physics counterparts, Majorana fermions are zero energy, chargeless, spinless, composite quasiparticles, residing at the boundaries of so-called topological superconductors. Furthermore, in opp...
Article
Full-text available
Majorana fermions have recently garnered a great attention outside the field of particle physics, in condensed matter physics. In contrast to their particle physics counterparts, Majorana fermions are zero energy, chargeless, spinless, composite quasiparticles, residing at the boundaries of so-called topological superconductors. Furthermore, in opp...
Article
Full-text available
The catalytic growth on transition metal surfaces provides a clean and controllable route to obtain defect free, monocrystalline graphene. On the other hand, graphene’s optical and electronic properties are diminished by the interaction with the metal substrate. One way to overcome this obstacle is the intercalation of atoms and molecules decouplin...
Article
Full-text available
Cryo-electron microscopy can determine the structure of biological matter in vitrified liquids. However, structure alone is insufficient to understand the function of native and engineered biomolecules. So far, their mechanical properties have mainly been probed at room temperature using tens of pico-newton forces with a resolution limited by therm...
Article
Metal-surface physisorbed graphene nanoribbons (GNRs) constitute mobile nanocontacts whose interest is simultaneously mechanical, electronic, and tribological. Previous work showed that GNRs adsorbed on Au(111) generally slide smoothly and superlubrically owing to incommensurability of their structures. We address here the nanomechanics of detachme...
Article
Full-text available
Conformational isomers are stereoisomers that can interconvert over low potential barriers by rotation around a single bond. However, such bond rotation is hampered by geometrical constraints when molecules are adsorbed on surfaces. Here, we show that the adsorption of 4,4′-bis(4-carboxyphenyl)-6,6′-dimethyl-2,2′-bipyridine molecules on surfaces le...
Article
On-surface chemical reaction has become a very powerful technique to conjugate small precursor molecules and several reactions have been proposed with the aim to fabricate functional nanostructures on surfaces. Here we present an unforeseen adsorption mode of 9,10-bis((trimethylsilyl)ethynyl)anthracene on a Cu(111)surface and the resulting one-shot...
Article
Full-text available
Bodies in relative motion separated by a gap of a few nanometers can experience a tiny friction force. This non-contact dissipation can have various origins and can be successfully measured by a sensitive pendulum atomic force microscope tip oscillating laterally above the surface. Here, we report on the observation of dissipation peaks at selected...
Article
Full-text available
Friction is the oldest branch of non-equilibrium condensed matter physics and, at the same time, the least established at the fundamental level. A full understanding and control of friction is increasingly recognized to involve all relevant size and time scales. We review here some recent advances on the research focusing of nano- and mesoscale tri...
Preprint
Controlling chirality at surfaces is of paramount importance for future applications in molecular electronics which need molecules that can be switched between two states. Conformational isomers can interconvert over low potential barriers (such as rotation around a single bond). Here we demonstrate, using 4,4'-bis(4-carboxyphenyl)-6,6'-dimethyl-2,...
Article
Full-text available
Substituting heteroatoms into nanostructured graphene elements, such as graphene nanoribbons, offers the possibility for atomic engineering of electronic properties. To characterize these substitutions, functionalized atomic force microscopy (AFM)—a tool to directly resolve chemical structures—is one of the most promising tools, yet the chemical an...
Article
Advances in organic chemistry allow the synthesis of large, complex and highly functionalized organic molecules having potential applications in optoelectronics, molecular electronics and organic solar cells. Their integration into devices as individual components or highly ordered thin-films is of paramount importance to address these future prosp...
Article
Full-text available
Quantum dots are known to confine electrons within their structure. Whenever they periodically aggregate into arrays and cooperative interactions arise, novel quantum properties suitable for technological applications show up. Control over the potential barriers existing between neighboring quantum dots is therefore essential to alter their mutual...
Article
We have performed molecular dynamics simulations of nanomanipulation experiments on short single-stranded DNA chains elastically driven on a graphene surface. After a brief transient, reproducible stick-slip cycles are observed on chains made by ten units of thymine, cytosine, adhenine and guanine. The cycles have the periodicity of the graphene su...
Article
Single molecule force spectroscopy of DNA strands adsorbed at surfaces is a powerful technique used in air or liquid environments to quantify their mechanical properties. Although the force responses are limited to unfolding events so far, single base detection might be possible in more drastic cleanliness conditions such as ultra high vacuum. Here...
Article
Full-text available
The surface diffusion of individual molecules is of paramount importance in self-assembly processes and catalytic processes. However, the fundamental understanding of molecule diffusion peculiarities considering conformations and adsorption sites remain poorly known at the atomic-scale. Here, we probe 4’-(4-tolyl)-2,2’:6’,2”-terpyridine adsorbed on...
Article
Full-text available
Electron donor-acceptor molecules are of outstanding interest in molecular electronics and organic solar cells for their intramolecular charge transfer controlled via electrical or optical excitation. The preservation of their electronic character in the ground state upon adsorption on a surface is cardinal for their implementation in such single-m...
Article
According to Hückel theory, an anti-aromatic molecule possessing (4n)π-electrons becomes unstable. Although the stabilization has been demonstrated by radialene-type structures - fusing aromatic rings to anti-aromatic rings - in solution, such molecules have never been studied at a single molecular level. Here, we synthesize a cyclobutadiene deriva...
Article
Full-text available
Remy Pawlak and Tobias Meier discuss how they got involved in the first international NanoCar Race and their impressions from this experience.
Chapter
Friction has long been the subject of research: the empirical da Vinci-Amontons friction laws have been common knowledge for centuries. Macroscopic experiments performed by the school of Bowden and Tabor (Bowden and Tabor 1950) revealed that macroscopic friction can be related to the collective action of small asperities. Over the last 25 years, ex...
Article
Functionalization of surfaces has become of high interest for a wealth of applications such as sensors, hybrid photovoltaics, catalysis, and molecular electronics. Thereby molecule-surface interactions are of crucial importance for the understanding of interface properties. An especially relevant point is the anchoring of molecules to surfaces. In...
Article
Full-text available
The hydrogen atom—the smallest and most abundant atom—is of utmost importance in physics and chemistry. Although many analysis methods have been applied to its study, direct observation of hydrogen atoms in a single molecule remains largely unexplored. We use atomic force microscopy (AFM) to resolve the outermost hydrogen atoms of propellane molecu...
Article
Friction forces, which arise when two bodies that are in contact are moved with respect to one another, are ubiquitous phenomena. Although various measurement tools have been developed to study these phenomena at all length scales, such investigations are highly challenging when tackling the scale of single molecules in motion on a surface. This wo...
Article
Full-text available
The adsorption of Cu-porphyrin derivatives terminated with peripheral carboxyphenyl side groups on hydroxylated TiO2(110) surfaces is investigated by combined scanning tunneling microscopy (STM), atomic force microscopy (AFM) and density functional theory (DFT). Two distinct contrasts of the molecules are revealed by STM and tunnelling spectroscopy...
Article
Full-text available
Zn(II)phthalocyanine molecules (ZnPc) were thermally deposited on a rutile TiO2(011) surface and on Zn(II)meso-tetraphenylporphyrin (ZnTPP) wetting layers at room temperature and after elevated temperature thermal processing. The molecular homo- and heterostructures were characterized by high-resolution scanning tunneling microscopy (STM) at room t...
Article
Full-text available
On-surface chemical reactions hold the potential for manufacturing nanoscale structures directly onto surfaces by linking carbon atoms in a single step reaction. To fabricate more complex and functionalized structures, the control of the on-surface chemical reactions must be developed significantly. Here, we present a thermally-controlled sequentia...
Data
Supplementary Figures 1-13, Supplementary Table 1, Supplementary Discussion and Supplementary References