A5054629337- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Mechanical and Optical Resonators
- Graphene research and applications
- Surface and Thin Film Phenomena
- Ion-surface interactions and analysis
- Quantum and electron transport phenomena
- Adhesion, Friction, and Surface Interactions
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Robotic Locomotion and Control
- Semiconductor Quantum Structures and Devices
- Anodic Oxide Films and Nanostructures
- Topological Materials and Phenomena
- Advancements in Battery Materials
- Nanofabrication and Lithography Techniques
- Mass Spectrometry Techniques and Applications
- Prosthetics and Rehabilitation Robotics
- Polymer Surface Interaction Studies
- Boron and Carbon Nanomaterials Research
- Block Copolymer Self-Assembly
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photovoltaic System Optimization Techniques
University of Basel
2016-2019
Florida Institute for Human and Machine Cognition
2018
George Washington University
2016-2017
Japan Science and Technology Agency
2017
Motivated by the striking promise of quantum computation, Majorana bound states (MBSs) in solid-state systems have attracted wide attention recent years. In particular, wavefunction localization MBSs is a key feature and crucial for their future implementation as qubits. Here, we investigate spatial electronic characteristics topological superconducting chains iron atoms on surface Pb(110) combining scanning tunneling microscopy (STM) atomic force (AFM). We demonstrate that Fe are...
High-resolution atomic force microscopy can resolve the difference among B, C, and N atoms.
Atomic force microscopy can image the hydrogen atoms of single molecules via very weak bonding.
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, control of on-surface must be developed significantly. Here, we present thermally controlled sequential three-step transformation hydrocarbon molecule on Cu(111) surface. With combination high-resolution atomic force microscopy first-principles computations, investigate...
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 rings—in solution, such molecules have never studied at a single molecular level. Here, we synthesize cyclobutadiene derivative, dibenzo[b,h]biphenylene, on-surface intramolecular reaction. With combination of high-resolution atomic force microscopy and density functional theory calculations,...
Abstract 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 is therefore essential alter mutual crosstalk. Here we that precise engineering of barrier width can be experimentally achieved on surfaces by a single atom substitution in haloaromatic compound,...
The on-surface Ullmann-type chemical reaction synthesizes polymers by linking carbons of adjacent molecules on solid surfaces. Although an organometallic compound is recently identified as the intermediate, little known about detailed structure bonded species and its influence molecule reaction. Herein atomic force microscopy at low temperature used to study with 3,9-diiododinaphtho[2,3-b:2',3'-d]thiophene (I-DNT-VW), which polymerized Ag(111) in vacuum. Thermally sublimated I-DNT-VW picks...
The surface diffusion of individual molecules is paramount importance in self-assembly processes and catalytic processes. However, the fundamental understanding molecule peculiarities considering conformations adsorption sites remain poorly known at atomic scale. Here, we probe 4'-(4-tolyl)-2,2':6',2″-terpyridine adsorbed on Au(111) herringbone structure combining scanning tunneling microscopy force microscopy. Molecules are controllably translated by electrons excitations over...
Abstract Cryo-electron microscopy can determine the structure of biological matter in vitrified liquids. However, alone is insufficient to understand function native and engineered biomolecules. So far, their mechanical properties have mainly been probed at room temperature using tens pico-newton forces with a resolution limited by thermal fluctuations. Here we combine force spectroscopy computer simulations cryogenic conditions quantify adhesion intra-molecular spray-deposited single-strand...
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 electronic character the ground state upon adsorption on a surface is cardinal implementation such single-molecule devices. Here, we investigate by atomic force microscopy scanning tunneling prototypical system consisting π-conjugated tetrathiafulvalene-fused dipyridophenazine...
Friction forces, which arise when two bodies that are in contact moved with respect to one another, ubiquitous phenomena. Although various measurement tools have been developed study these phenomena at all length scales, such investigations highly challenging tackling the scale of single molecules motion on a surface. This work reviews recent advances single-molecule manipulation experiments performed low temperature aim understanding fundamental frictional response molecules. Following...
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 (AFM), and density functional theory (DFT). Two distinct contrasts the molecules are revealed STM spectroscopy. Via single-molecule manipulations, origin these peculiar found to arise from presence or not hydroxyl below molecules. Hence, electronic coupling molecule underlying TiO2...
Unravelling structures of organic molecules after their deposition on Au(111) with electrospray.
We introduce a new multifrequency atomic force microscopy (AFM) method which involves the excitation of flexural and torsional eigenmodes microcantilever probe in liquid environments. The deflection signals are mostly decoupled majority commercial AFM setups, so they can be relatively easily recorded processed. use modes provides additional surface information at scale, with respect to mode imaging alone, although only ones capable 'true' resolution imaging. In our experiments, shown...
Bending and twisting around carbon–carbon single bonds are ubiquitous in natural synthetic polymers. Force-induced changes were so far not measured at the single-monomer level, owing to limited ways apply local forces. We quantified down submolecular level mechanical response within individual poly-pyrenylene chains upon their detachment from a gold surface with an atomic force microscope 5 K. Computer simulations based on dedicated field reproduce experimental traces reveal symmetry-broken...
We demonstrate a simple and robust procedure for the fabrication of rhodamine-doped nanoporous poly(methyl methacrylate) (PMMA) films, whose optical properties, such as anti-reflection, fluorescence absorption can be tailored to specific applications. By exploiting phase separation binary polymer blend (PMMA polystyrene), we fabricated foam-like films that could easily cost-effectively integrated into process components. link film morphology, studied by multifrequency atomic force microscopy...
Bioinspired design has been central in the development of hierarchical nanocomposites. Particularly, nacre-mimetic brick-and-mortar structure shown excellent mechanical properties, as well gas-barrier properties and optical transparency. Along with these intrinsic layered also utilized sensing devices. Here we extend multifunctionality nacre-mimetics by designing an optically transparent electron conductive coating based on PEDOT:PSS nanoclays Laponite RD Cloisite Na
The influence of photochemical and thermal aging on the morphology material properties EVA was investigated by means Atomic Force Microscopy (AFM) Raman spectroscopy. encapsulation, for which is used in most c-Si PV modules, great importance long-term stability modules. Delamination between encapsulation solar cell or glass may occur whilst outdoor exposition. In order to understand processes take place at EVA/Silicon EVA/Air interface during exposure UV radiation elevated temperature, thin...
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 responses are limited unfolding events so far, single base detection might be possible more drastic cleanliness conditions such as ultra high vacuum. Here, we report on resolution imaging and pulling attempts low temperature (5K) strand (ssDNA) molecules composed 20 cytosine bases Au(111) by scanning probe...